DAC38RF82IAAVR [TI]
双通道 14 位 9GSPS 1x-24x 内插 6GHz 和 9GHz PLL 数模转换器 (DAC) | AAV | 144 | -40 to 85;型号: | DAC38RF82IAAVR |
厂家: | TEXAS INSTRUMENTS |
描述: | 双通道 14 位 9GSPS 1x-24x 内插 6GHz 和 9GHz PLL 数模转换器 (DAC) | AAV | 144 | -40 to 85 转换器 数模转换器 |
文件: | 总147页 (文件大小:4208K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
具有 JESD204B 接口、片上 PLL 和宽带插值的 DAC38RF8x 双通道、差
分输出、14 位、9GSPS、射频采样 DAC
1 特性
在双通道运行状态下,无插值时输入接口的数据速率高
1
达 3.33GSPS(12 位分辨率)和 2.5GSPS(16 位分
辨率)。当用作具有 2x 至 24x 插值模式的复合基带发
送器时,DAC38RF82 或 DAC38RF89 可以合成具有
16 位输入分辨率的高达 2GHz 带宽的宽带信号和具有
12 位输入分辨率的 2.66GHz 带宽的宽带信号。
•
具有多模式运行方式的 14 位分辨率、9GSPS DAC
–
16 位、双通道数据模式
–
–
最大输入速率:2.5GSPS
宽带数字上变频器
–
插值:1、2、4、6、8、10、12、16、
18、20、24x
8 位模式允许以 9GSPS 的最大 DAC 采样率进行输
入,并可合成 0 至 4.5GHz 的宽带信号。
–
–
12 位、双通道数据模式
–
–
最大输入速率:3.33GSPS
可选的低抖动 PLL/VCO 通过允许使用频率较低的参考
时钟来简化 DAC 时钟的生成。DAC38RF82 和
DAC38RF89 支持不同的 VCO 频率范围,如器件比较
表 所示。
宽带数字上变频器
–
插值:1、2、24x
8 位、单通道数据模式
最大输入速率:9GSPS
JESD204B 接口
–
器件信息(1)
•
•
–
–
子类 1 支持多芯片同步
器件型号
DAC38RF82
DAC38RF89
封装
封装尺寸(标称值)
最大通道速率:12.5Gbps
FCBGA (144)
10.0mm x 10.0mm
差分输出
–
–
支持直流耦合
(1) 如需了解所有可用封装,请参阅产品说明书末尾的可订购产品
附录。
射频满量程输出功率(采用 2:1 平衡-非平衡变
压器):
2.14GHz 时为 3dBm
32x6MHz 256QAM 载波
•
具有旁路功能的内部 PLL 和 VCO
–
–
DAC38RF82:fC(VCO) = 5.9 或 8.9GHz
DAC38RF89:fC(VCO) = 5 或 7.5GHz
•
•
电源:-1.8V、1.0V、1.8V
封装:10mm x 10mm BGA,间距为 0.8mm,
144 个焊球
2 应用
•
•
•
•
•
任意波形发生器
雷达和电子战
通信测试设备
符合 DOCSIS 3.0/3.1 要求的直接射频合成
微波回程
3 说明
DAC38RF82 和 DAC38RF89 是高性能的宽带宽型射
频采样数模转换器 (DAC),能够实现高达 3.33GSPS
的双通道输入数据速率或高达 9GSPS 的 8 位单通道
运行状态。这些器件具有一个多达 8 通道的低功耗
JESD204B 接口,最大比特率为 12.5Gbps。
1
本文档旨在为方便起见,提供有关 TI 产品中文版本的信息,以确认产品的概要。 有关适用的官方英文版本的最新信息,请访问 www.ti.com,其内容始终优先。 TI 不保证翻译的准确
性和有效性。 在实际设计之前,请务必参考最新版本的英文版本。
English Data Sheet: SLASEA6
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
目录
8.3 Feature Description................................................. 25
8.4 Device Functional Modes........................................ 62
8.5 Register Maps ........................................................ 66
Application and Implementation ...................... 128
9.1 Application Information.......................................... 128
9.2 Typical Application ............................................... 129
1
2
3
4
5
6
7
特性.......................................................................... 1
应用.......................................................................... 1
说明.......................................................................... 1
修订历史记录 ........................................................... 2
Device Comparison Table..................................... 4
Pin Configuration and Functions......................... 4
Specifications......................................................... 7
7.1 Absolute Maximum Ratings ...................................... 7
7.2 ESD Ratings.............................................................. 7
7.3 Recommended Operating Conditions....................... 7
7.4 Thermal Information.................................................. 8
7.5 Electrical Characteristics - DC Specifications........... 8
7.6 Electrical Characteristics - Digital Specifications .... 10
7.7 Electrical Characteristics - AC Specifications ......... 13
7.8 PLL/VCO Electrical Characteristics ........................ 16
7.9 Timing Requirements.............................................. 17
7.10 Typical Characteristics.......................................... 18
Detailed Description ............................................ 23
8.1 Overview ................................................................. 23
8.2 Functional Block Diagrams ..................................... 23
9
10 Power Supply Recommendations ................... 133
10.1 Power Supply Sequencing.................................. 134
11 Layout................................................................. 134
11.1 Layout Guidelines ............................................... 134
11.2 Layout Example .................................................. 136
12 器件和文档支持 ................................................... 137
12.1 相关链接.............................................................. 137
12.2 接收文档更新通知 ............................................... 137
12.3 支持资源.............................................................. 137
12.4 商标..................................................................... 137
12.5 静电放电警告....................................................... 137
12.6 Glossary.............................................................. 137
13 机械、封装和可订购信息..................................... 137
8
4 修订历史记录
注:之前版本的页码可能与当前版本有所不同。
Changes from Revision B (August 2017) to Revision C
Page
•
•
•
•
•
•
•
•
Changed the tr NOM value from 50 ns To 50 ps in the Anaolog Output of the Timing Requirements table ....................... 17
Changed the tf NOM value from 50 ns To 50 ps in the Anaolog Output of the Timing Requirements table ....................... 17
Changed the MPY values in Table 4.................................................................................................................................... 27
Changed The title From: SerDes PLL Modes Selection To: SerDes PLL Multiplier (MPY) Values in in Table 4................ 27
Added section: Digital Quadrature Modulator....................................................................................................................... 53
Added section: Low Power Coarse Resolution Mixing Modes............................................................................................. 54
Added cross reference to MPY values in Table 132 ......................................................................................................... 124
Changed the enable/disable description for bit [15:13] of Table 134 ................................................................................ 126
Changes from Revision A (April 2017) to Revision B
Page
•
•
•
已删除 将特性 中的“插值:1、2、4、24x”更改为“插值:1、2、24x” .................................................................................... 1
Changed the ALARM pin From: alarm_out_pol To: alm_out_pol in the Pin Functions table................................................. 5
Changed the Description of pins A3, A4, A7, A6, A9, A10, A12, E12, F11, F7, G6, H5, H7, J6, J11 in the Pin
Functions table ....................................................................................................................................................................... 5
•
•
•
•
•
•
•
Changed description of TXENABLE pin in the PIN Functions table ...................................................................................... 6
Changed the MAX value of VEE18N rail From: 0.5 V To 0.3 V in the Absolute Maximum Ratings table............................. 7
Added "Supply Voltage Range" to the Recommended Operating Conditions table .............................................................. 7
Changed DNL typical value From: ±0.5 to ±3 LSB in Electrical Characteristics - DC Specifications table ........................... 8
Changed INL typical value From: ±1 To: ±4 LSB in Electrical Characteristics - DC Specifications table.............................. 8
Added "Reference voltage drift" to the Electrical Characteristics - DC Specifications table.................................................. 8
Changed Power Dissipation Test Condition From: MODE 5: dual channel, 8-bit input mode, 2x Interpolation To:
MODE 5: dual channel, 8-bit input mode, 1x Interpolation in the Electrical Characteristics - DC Specifications .................. 9
•
Changed the ILOAD values to negative for CMOS interface parameter, low-level output voltage, in the Electrical
2
版权 © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
Characteristics - Digital Specifications table......................................................................................................................... 10
Added 0 dBFS to the condition statement for the Electrical Characteristics - AC Specifications table ............................... 13
•
•
Added MIN and TYP value to maximum DAC sample rate for DAC38RF89 only in the Electrical Characteristics - AC
Specifications table............................................................................................................................................................... 13
•
•
Added NSD values for DAC38RF82 with on-chip PLL enabled to Electrical Characteristics - AC Specifications table...... 15
Changed the Isolation values in the TEST CONDITIONS, TYP value From: 74 dBc To: 82 dBc and 56 dBc To 73
dBc in the Electrical Characteristics - AC Specifications table............................................................................................. 15
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Added Figure 16 ................................................................................................................................................................... 19
Added MPY value for 16.5x in the Table 4........................................................................................................................... 27
Changed input rate max and fdac max for 6x interpolation mode in Table 9 ..................................................................... 30
Changed input data rate From: 6666 MSPS To: 3333 MSPS for LMFSHd=41380, 2x interpolation in Table 9 ................ 31
Changed Table 12, JESD204B frame format for LMFSHd=84111 ..................................................................................... 31
Changed Table 14, JESD204B frame format for LMFSHd=44210 ...................................................................................... 32
Changed Table 16, JESD204B frame format for LMFSHd = 24410.................................................................................... 32
Changed Table 17, JESD204B frame format for LMFSHd = 44210.................................................................................... 32
Changed Table 18, JESD204B frame format for LMFSHd = 88210.................................................................................... 33
Changed Table 19, JESD204B frame format for LMFSHd = 24410.................................................................................... 33
Changed Table 20, JESD204B frame format for LMFSHd=48410 ...................................................................................... 33
Changed Table 21, JESD204B frame format for LMFSHd = 24310.................................................................................... 33
Changed Table 22, JESD204B frame format for LMFSHd = 48310.................................................................................... 33
Changed Table 23, JESD204B frame format for LMFSHd = 81180.................................................................................... 34
Changed Table 24, JESD204B frame format for LMFSHd = 41380.................................................................................... 34
Changed Table 26, JESD204B frame format for LMFSHd = 41121.................................................................................... 35
Added Table 27, JESD204B frame format for LMFSHd = 41121 ........................................................................................ 36
Changed Table 38 ................................................................................................................................................................ 47
Changed register field programming values for LMFSHd=24410, 41380, 41121 and 24310 in the Register
Programming for JESD and Interpolation Mode table.......................................................................................................... 52
•
•
•
•
•
•
•
•
Changed the bit positions of N_M1 register field From: 12-8 To: 4-0 in the Table 42 table ................................................ 53
Changed the bit positions of N_M1’ (NPRIME_M1) register field From: 4-0 To: 12-0 in the Table 42 table....................... 53
Changed the description of DAC PLL alarm in Alarm Monitoring ........................................................................................ 58
Changed from BIST_ENA to Reserved in Table 61 ............................................................................................................ 78
Changed from BIST_ZERO to Reserved in Table 61 ......................................................................................................... 78
Changed the description of OUTSUM_SEL field in Table 69 ............................................................................................. 84
Changed the Description of Bit 11 From "dummy data generation" to "distortion enhancement" in Table 116 ............... 114
已更改 the junction temp and loop filter voltage range for PLL tuning in 图 142 ............................................................... 128
Changes from Original (February 2017) to Revision A
Page
•
•
•
•
•
•
Corrected the NSD values for -9dBFS in Electrical Characteristics - AC Specifications table ........................................... 15
Added PLL/VCO characteristics table to PLL/VCO Electrical Characteristics ..................................................................... 16
Added JESD204B clock phase register setting to Table 41 ................................................................................................ 52
Removed descriptions for CLKJESD_DIV register from Table 41 ...................................................................................... 52
Added JESD204B clock phase register setting to Table 42 ................................................................................................ 52
Added information about the DAC output total current for various full scale current settings in DAC Fullscale Output
Current ................................................................................................................................................................................. 60
•
•
•
Changed Bit 0 of Table 128 From: Enables the GSM PLL To: Reserved.......................................................................... 121
Changed Table 130 ........................................................................................................................................................... 123
Changed description of SERDES_REFCLK_DIV register field in Table 131 .................................................................... 124
Copyright © 2017–2020, Texas Instruments Incorporated
3
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
•
Changed Bit 12:11, 6:5 and 4:2 of Table 134 ................................................................................................................... 126
4
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
5 Device Comparison Table
PART NUMBER
DAC38RF82
DAC38RF89
ANALOG OUTPUT TYPE
VCO0 CENTER FREQUENCY
VCO1 CENTER FREQUENCY
Differential
Differential
5.9 GHz
5 GHz
8.9 GHz
7.5 GHz
6 Pin Configuration and Functions
AAV Package
144-Pin (FCBGA)
Top View
A
B
C
D
E
F
G
H
J
K
L
M
12
11
10
9
DACCLKSE VSSCLK
AGND
VOUT2+
VOUT2-
AGND
VDDOUT18 VDDOUT18
AGND
VOUT1-
VOUT1+
AGND
VSSCLK
VSSCLK
AGND
EXTIO
AGND
AGND
VDDA1
VDDA18
VDDA18
VDDA1
VSSCLK
VSSCLK
VSSCLK
DGND
AGND
VEE18N
RESET
ALARM
GPI0
AGND
VEE18N
SCLK
AGND
SDIO
SDO
DACCLK+ VDDAPLL18
DACCLK- VDDAPLL18
VEE18N
VEE18N
VSSCLK
VDDL2_1
VDDL2_1
RBIAS VDDAVCO18VDDAVCO18 VSSCLK
VDDCLK1 VDDCLK1
8
VSSCLK
CLKTX+
CLKTX-
VDDDIG1
SYSREF-
SYSREF+
DGND
VSSCLK
VDDTX18
VDDTX1
VDDDIG1
VDDS18
VDDS18
DGND
ATEST
SYNC1+
SYNC1-
VDDDIG1
SYNC0+
SYNC0-
DGND
VDDPLL1 VDDPLL1
VSSCLK
VDDE1
DGND
VDDL1_1
DGND
VDDL1_1
VDDE1
DGND
SLEEP
GPO0
GPO1
DGND
DGND
DGND
DGND
RX1-
SDEN
GPI1
7
VDDDIG1
DGND
DGND
VDDDIG1
VDDDIG1
VDDDIG1
VDDDIG1
DGND
6
VDDE1
VDDDIG1
VDDDIG1
AMUX0
DGND
VDDE1
TRST
TXENABLE
DGND
RX3+
RX3-
5
VDDDIG1
VSENSE
IFORCE
DGND
VDDDIG1
VDDDIG1
AMUX1
DGND
VDDIO18
TMS
4
TDI
TDO
TCLK
3
VDDT1
VDDR18
RX4+
VDDT1
VDDR18
RX0+
TESTMODE
DGND
RX2-
2
RX2+
1
RX7+
RX7-
RX6-
RX6+
RX5+
RX5-
RX4-
RX0-
RX1+
Not to scale
Copyright © 2017–2020, Texas Instruments Incorporated
5
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
Pin Functions
PIN
I/O
DESCRIPTION
NO.
NAME
C11, C12, D11, E11,
F12, J12, K11, L11,
M11, M12
AGND
–
Analog ground.
CMOS output for ALARM condition. Default polarity is active low, but can be changed to active high via
RESET_CONFIG alm_out_pol control bit..
K8
ALARM
O
G3
F3
AMUX0
O
O
O
O
O
I
Analog test pin for SerDes, Lane 0 to Lane 3. Can be left floating.
AMUX1
Analog test pin for SerDes, Lane 4 to Lane 7. Can be left floating.
C8
A7
ATEST
Analog test pin for DAC, references and PLL. Can be left floating.
CLKTX+
CLKTX-
Divided output clock, internal 100 Ω differential termination, self-biased, positive terminal.
Divided output clock, internal 100 Ω differential termination, self-biased, negative terminal.
Device clock, internal 100 Ω differential termination, self-biased, positive terminal.
Device clock, internal 100 Ω differential termination, self-biased, negative terminal.
Single ended device clock optional input. Can be left floating if not used, internal 50 Ω termination.
A6
A10
A9
DACCLK+
DACCLK-
DACCLKSE
I
A12
I
A2, B2, C2, D2, D6, E2,
E7, F2, F6, G2, G7, H6,
J7, K2, L2, L3, L4, L5,
M6
DGND
-
Digital ground.
C10
K7
M7
L7
EXTIO
GPI0
I/O
-
Requires a 0.1 μF decoupling capacitor to AGND.
Factory use only. User should GND.
Factory use only. User should GND.
Used for CMOS SYNC0\ signal.
GPI1
-
GPO0
GPO1
IFORCE
O
O
O
L6
Used for CMOS SYNC1\ signal.
D3
Test pin for on chip parametrics. Can be left floating.
Full-scale output current bias. Change the full-scale output current through DACFS in register DACFS
(8.5.72). Expected to be 3.6 kΩ to GND for 40 mA full scale output.
C9
K9
RBIAS
O
I
Active low input for chip RESET, which resets all the programming registers to their default state. Internal
pull-up.
RESET
J1
K1
M1
L1
RX0+
RX0-
RX1+
RX1-
RX2+
RX2-
RX3+
RX3-
RX4+
RX4-
RX5+
RX5-
RX6+
RX6-
RX7+
RX7-
SCLK
SDEN
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
CML SerDes interface lane 0 input, positive
CML SerDes interface lane 0 input, negative
CML SerDes interface lane 1 input, positive
CML SerDes interface lane 1 input, negative
CML SerDes interface lane 2 input, positive
CML SerDes interface lane 2 input, negative
CML SerDes interface lane 3 input, positive
CML SerDes interface lane 3 input, negative
CML SerDes interface lane 4 input, positive
CML SerDes interface lane 4 input, negative
CML SerDes interface lane 5 input, positive
CML SerDes interface lane 5 input, negative
CML SerDes interface lane 6 input, positive
CML SerDes interface lane 6 input, negative
CML SerDes interface lane 7 input, positive
CML SerDes interface lane 7 input, negative
Serial interface clock. Internal pull-down.
M2
M3
M5
M4
H1
G1
E1
F1
D1
C1
A1
B1
L9
M8
Active low serial data enable, always an input to the DAC38RFxx. Internal pull-up.
Serial interface data. Bi-directional in 3-pin mode (default) and uni-directional input 4-pin mode. Internal
pull-down.
M10
M9
SDIO
SDO
I/O
O
Uni-directional serial interface data output in 4-pin mode. The SDO pin is tri-stated in 3-pin interface
mode (default).
L8
C4
C3
C7
C6
SLEEP
I
Active high asynchronous hardware power-down input. Internal pull-down.
Synchronization request to transmitter for JESD204B link 0, LVDS positive output.
Synchronization request to transmitter for JESD204B link 0, LVDS negative output.
Synchronization request to transmitter for JESD204B link 1, LVDS positive output.
Synchronization request to transmitter for JESD204B link 1, LVDS negative output.
SYNC0+
SYNC0-
SYNC1+
SYNC1-
O
O
O
O
6
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
Pin Functions (continued)
PIN
I/O
DESCRIPTION
NO.
NAME
LVPECL SYSREF positive input, internal 100 Ω differential termination, self biased. This
positive/negative pair is captured with the rising edge of DACCLKP/N. It is used for multiple DAC
synchronization.
A3
SYSREF+
I
I
LVPECL SYSREF negative input, self biased, internal 100 Ω differential termination. (See the SYSREF+
description)
A4
SYSREF-
K4
H4
J4
TCLK
TDI
I
I
JTAG test clock. Internal pull-down
JTAG test data in. Internal pull-up
JTAG test data out. Internal pull-up
TDO
O
This pin is used for factory testing.
Recommended to connect to ground for normal operation.
K3
TESTMODE
-
K5
J5
TMS
I
I
JTAG test mode select. Internal pull-up
TRST
JTAG test reset. Internal pull-up. Must be connected to ground if not used
Transmit enable active high input. Internal pull-down.
This pin is ORed with spi_txenable bit in JESD_FIFO register to enable analog output data transmission.
To enable analog output data transmission, pull CMOS TXENABLE pin to high.
To disable analog output, pull CMOS TXENABLE pin to low. The DAC output is forced to midscale.
K6
TXENABLE
I
F11, J11
G11, H11
D8, E8
VDDA1
I
I
I
I
I
Analog 1 V supply voltage. Must be separated from VDDDIG1 supply for best performance.
Analog 1.8 V supply voltage. (1.8 V)
VDDA18
VDDPLL1
VDDAPLL18
VDDAVCO18
Analog 1 V supply for PLL.
B9, B10
D9, E9
PLL analog supply voltage. (1.8 V)
Analog supply voltage for VCO (1.8 V)
Internal clock buffer supply voltage (1 V).
It is recommended to isolate this supply from VDDDIG1 and VDDA1.
G9, H9
VDDCLK1
I
G8, H8
VDDL1_1
VDDL2_1
I
I
DAC core supply voltage. (1 V)
DAC core supply voltage. (1 V)
G10, H10
A5, B5, C5, D5, D7, E3,
E4, E5, E6, F4, F5, G4, VDDDIG1
G5
Digital supply voltage. (1 V).
It is recommended to isolate this supply from VDDCLK1 and VDDA1.
I
I
Digital Encoder supply voltage (1 V).
Must be separated from VDDDIG1 supply
F7, H7, G6, J6
VDDE1
H5
VDDIO18
VDDOUT18
VDDR18
VDDS18
VDDT1
I
I
Supply voltage for all digital I/O and CMOS I/O. (1.8 V)
DAC output supply. (1.8 V)
G12, H12
H2, J2
I
Supply voltage for SerDes. (1.8 V)
B3, B4
I
Supply voltage for LVDS SYNC0+/- and SYNC1+/- (1.8 V)
Supply voltage for SerDes termination. (1 V)
Supply voltage for divided clock output. (1 V)
Supply voltage for divided clock output . (1.8 V)
Analog supply voltage. (-1.8 V)
H3, J3
I
B6
VDDTX1
VDDTX18
VEE18N
VOUT1+
VOUT1-
VOUT2+
VOUT2-
VSENSE
I
B7
I
D10, E10, K10, L10
I
L12
K12
D12
E12
D4
O
O
O
O
O
DAC channel 1 output.
DAC channel 1 complementary output.
DAC channel 2 output.
DAC channel 2 complementary output.
Test pin for on chip parametrics. Can be left floating.
A8, A11, B8, B11, B12,
F8, F9, F10, J8, J9, J10
VSSCLK
-
Clock ground.
Copyright © 2017–2020, Texas Instruments Incorporated
7
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
MAX
UNIT
VDDDAC1, VDDDIG1, VDDL1_1, VDDL2_1,
VDDCLK1, VDDT1, VDDCLK1, VDDTX1, VDDE1
–0.3
1.3
V
VDDR18, VDDIO18, VDDS18, VDDAPLL18,
VDDAREF18, VDDAOUT18, VDDA18,
VDDAVCO18, VDDTX18
Supply Voltage Range(2)
–0.3
2.45
V
VEE18N
–2
0.3
0.3
V
V
V
Voltage between AGND and DGND
–0.3
–0.5
RX[0..7]+/-
VDDDIG1 + 0.5 V
SDEN, SCLK, SDIO, SDO, TXENABLE, ALARM,
RESET, SLEEP, TMS, TCLK, TDI, TDO, TRST,
TESTMODE, GPI0, GPI1, GPO0, GPO1
–0.5
VDDIO + 0.5 V
V
CLKOUT+/-
–0.5
–0.5
–0.5
–0.5
–0.5
–0.5
–0.5
VDDTX18 + 0.5 V
VDDCLK1 + 0.5 V
VDDS18 + 0.5 V
V
V
V
DACCLK+/-, SYSREF+/-, DACCLKSE
SYNC0+/-, SYNC1+/-
IOUT1+/-, IOUT2+/-
RBIAS, EXTIO, ATEST
IFORCE, VSENSE
Pin Voltage Range(2)
VDDAOUT18 + 0.5 V
VDDAOUT18 + 0.5 V
VDDDIG1 + 0.5 V
VDDT1 + 0.5 V
20
V
V
V
AMUX1, AMUX0
V
Peak input current (any input)
Peak total input current (all inputs)
Junction temperature TJ
mA
mA
°C
°C
°C
–30
150
85
Operating free-air temperature, TA
Storage temperature, Tstg
–40
–65
150
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Measured with respect to AGND or DGND.
7.2 ESD Ratings
VALUE
UNIT
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
±1000
V(ESD)
Electrostatic discharge
V
Charged-device model (CDM), per JEDEC specification JESD22-
C101(2)
±250
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
UNIT
°C
Recommended operating temperature
Maximum rated operating junction temperature(1)
Recommended free-air temperature
105
TJ
125
–40
°C
TA
85
°C
VDDA18, VDDAPLL18, VDDS18,
VDDIO18, VDDR18, VDDAPLL18,
VDDOUT18, VDDAVCO18
1.71
1.8
1.89
Supply Voltage Range
VDDDIG1 VDDA1, VDDT1, VDDAPLL1,
VDDCLK1, VDDL1_1, VDDL2_1,
VDDTX1, VDDE1
V
0.95
1
1.05
VEE18N
–1.89
–1.8
–1.71
(1) Prolonged use at this junction temperature may increase the device failure-in-time (FIT) rate
8
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
7.4 Thermal Information
DAC38RF82
DAC38RF89
THERMAL METRIC(1)
UNIT
AAV (FCBGA)
144 PINS
RθJA
Junction-to-ambient thermal resistance
25
1.0
7.7
0.1
7.7
N/A
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJC(top)
RθJB
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
ψJT
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
ψJB
RθJC(bot)
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Electrical Characteristics - DC Specifications
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, nominal supplies, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DC ACCURACY
8-bit Input Mode
8
12
16
14
Digital Input Resolution
12-bit Input Mode
16-bit Input Mode
bits
DAC Core Resolution
bits
LSB
LSB
DNL Differential nonlinearity
INL Integral nonlinearity
±3
±4
Analog Output
Gain Error
±2
30
%FSR
mA
Full scale output current
10
40
2:1 transformer coupled into 50 Ω- load.
Transformer (TCM2-452X-2+) loss not de-
embedded
P(OUTFS)
Full scale output power
3
dBm
2.1 GHz output frequency
Output Compliance Range
Output capacitance
Output resistance
1.3
2.3
V
Single ended to ground
Differential
1.5
pF
100
ohms
Reference Output: EXTIO
VREF Reference output voltage
0.9
100
±8
V
nA
Reference output current
Reference voltage drift
ppm/°C
Power Supply Current and consumption
1 V Digital supplies: VDDDIG1
815
1300
1250
mA
mA
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
1144
MODE 1: dual channel, 12-bit input mode, 2x
Interpolation, Sin(x)/x enabled, fDAC = 6 GHz,
CLKTX Disabled
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
218
270
mA
-1.8 V Supply: VEE18N
Power Dissipation
159
2638
798
180
mA
mW
mA
PDIS
3360
1 V Digital supplies: VDDDIG1
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
1026
222
mA
mA
MODE 2: dual channel, 16-bit input mode, 2x
Interpolation, Sin(x)/x enabled, fDAC = 5 GHz,
CLKTX Disabled
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
-1.8 V Supply: VEE18N
Power Dissipation
159
mA
PDIS
2510
mW
Copyright © 2017–2020, Texas Instruments Incorporated
9
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
Electrical Characteristics - DC Specifications (continued)
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, nominal supplies, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
1V Digital supplies: VDDDIG1
500
mA
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
751
218
mA
mA
MODE 3: dual channel, 12-bit input mode, 2x
Interpolation, Sin(x)/x enabled, fDAC = 3 GHz,
CLKTX Disabled
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
-1.8V Supply: VEE18N
Power Dissipation
159
1930
517
mA
mW
mA
PDIS
PDIS
PDIS
PDIS
1 V Digital supplies: VDDDIG1
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
708
222
mA
mA
MODE 4: dual channel, 16-bit input mode, 2x
Interpolation, Sin(x)/x enabled, fDAC = 2.5
GHz, CLKTX Disabled
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
-1.8 V Supply: VEE18N
Power Dissipation
159
1911
624
mA
mW
mA
1 V Digital supplies: VDDDIG1
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
1469
218
mA
mA
MODE 5: dual channel, 8-bit input mode, 1x
Interpolation, Sin(x)/x enabled, fDAC = 9 GHz,
CLKTX Disabled
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
-1.8 V Supply: VEE18N
Power Dissipation
159
2772
63
mA
mW
mA
1 V Digital supplies: VDDDIG1
568
105
1 V Analog supplies: VDDA1 VDDACLK1
VDDTX1 VDDAPLL1 VDDT1 VDDE1
18
47
mA
mA
1.8 V Supplies: VDDA18 VDDOUT18
VDDAVCO18 VDDAPLL18 VDDR18
VDDIO18 VDDS18 VDDTX18
MODE 6: Power down mode, no clock, DAC
in sleep, SerDes in sleep, CLKTX Disabled
51
-1.8 V Supply: VEE18N
Power Dissipation
23
208
25
28
mA
mW
mA
mA
mA
815
fDAC = 8847 MSPS, Clock Out Divider Enabled
fDAC = 5898 MSPS, Clock Out Divider Enabled
Clock Out Enabled
VDDTX1
19
VDDTX18
16
10
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
7.6 Electrical Characteristics - Digital Specifications
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CML SerDes Inputs: RX[7:0]+/-
VDIFF
Receiver input amplitude
50
1200
mV
TERM = 111
TERM = 001
TERM = 100
TERM = 101
600
700
0
VCOM
Input Common Mode Voltage
mV
250
100
ZDDIFF
fSerDes
Internal differential termination
SerDes bit rate
85
115
Ω
0.78125
12.5
Gbps
Differential Clock Inputs: SYSREF±, DACCLK±
fDACCLK
VCOM
VI(DPP)
ZT
DACCLK input frequency
Input common mode voltage
Differential input peak-to-peak voltage
Internal termination
0.1
9
GHz
V
0.5
800
100
2
2000
mV
Ω
CL
Input capacitance
pF
Duty cycle (DACCLK only
40%
60%
LVDS Output: SYNC0±, SYNC1±
VCOM
ZT
Output common mode voltage
1.2
100
500
V
Ω
Internal termination
VOD
Differential output voltage swing
mV
CML Output: DIVCLKOUT±
VOD CML OUTPUT: CLKTX+/-
1300
mV
CMOS Interface: SDEN, SCLK, SDIO, SDO, TXENABLE, ALARM, RESET, SLEEP, TMS, TCLK, TDI, TDO, TRST, TESTMODE, SYNCSE1,
SYNCSE2
0.7 x
VDDIO
VIH
VIL
High-level input voltage
Low-level input voltage
V
V
0.3 x
VDDIO
IIH
IIL
CI
High-level input current
Low-level input current
CMOS input capacitance
–40
–40
40
40
µA
µA
pF
2
VDDIO –
0.2
ILOAD = –100 µA
ILOAD = –2 mA
VOH
High-level output voltage
Low-level output voltage
V
V
0.8 x
VDDIO
ILOAD = 100 µA
ILOAD = 2 mA
0.2
0.5
VOL
Latency
full rate, RATE = “00”
half rate, RATE = “01”
quarter rate, RATE = “10”
eighth rate, RATE = “11”
34
29
RX SerDes Digital Delay
UI
26.5
26.25
JESD
clock
cycles
SerDes output to JED204B elastic buffer
input latency
21 -39
Copyright © 2017–2020, Texas Instruments Incorporated
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DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
Electrical Characteristics - Digital Specifications (continued)
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LMFSHD = 41121 or 82121, 1x Interpolation
LMFSHD = 41121 or 82121, 2x Interpolation
LMFSHD = 41121 or 82121, 4x Interpolation
LMFSHD = 41380 or 82380, 1x Interpolation
LMFSHD = 41380 or 82380, 2x Interpolation
LMFSHD = 81180, 1x Interpolation
269
417
717
293
465
289
LMFSHD = 82121, 6x Interpolation
269
LMFSHD = 82121, 8x Interpolation
1120
1602
2091
817
LMFSHD = 82121, 12x Interpolation
LMFSHD = 82121, 16x Interpolation
LMFSHD = 42111 or 84111, 6x Interpolation
LMFSHD = 42111 or 84111, 8x Interpolation
1057
LMFSHD = 42111 or 84111, 10x
Interpolation
1184
1532
1997
2142
LMFSHD = 42111 or 84111, 12x
Interpolation
LMFSHD = 42111 or 84111, 16x
Interpolation
LMFSHD = 42111 or 84111, 18x
Interpolation
LMFSHD = 42111 or 84111, 24x
Interpolation
2941
1020
1473
DAC clock
cycles
LMFSHD = 22210 or 44210, 8x Interpolation
Digital Latency: JESD Buffer to DAC Output
LMFSHD = 22210 or 44210, 12x
Interpolation
LMFSHD = 22210 or 44210, 16x
Interpolation
1917
2050
2275
2821
1912
LMFSHD = 22210 or 44210, 18x
Interpolation
LMFSHD = 22210 or 44210, 20x
Interpolation
LMFSHD = 22210 or 44210, 24x
Interpolation
LMFSHD = 12410 or 24410, 16x
Interpolation
LMFSHD = 12410 or 24410, 24x
Interpolation
2786
916
LMFSHD = 44210 or 88210, 8x Interpolation
LMFSHD = 44210 or 88210, 12x
Interpolation
1317
LMFSHD = 44210 or 88210, 16x
Interpolation
1709
2509
1672
1593
LMFSHD = 44210 or 88210, 24x
Interpolation
LMFSHD = 24410 or 48410, 16x
Interpolation
LMFSHD = 24410 or 48410, 24x
Interpolation
12
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
Electrical Characteristics - Digital Specifications (continued)
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
13
9
MAX
UNIT
LMFSHD = 41121 or 82121, 1x Interpolation
LMFSHD = 41121 or 82121, 2x Interpolation
LMFSHD = 41121 or 82121, 4x Interpolation
LMFSHD = 41380 or 82380, 1x Interpolation
LMFSHD = 41380 or 82380, 2x Interpolation
LMFSHD = 81180, 1x Interpolation
6
15
10
6
LMFSHD = 82121, 6x Interpolation
5
LMFSHD = 82121, 8x Interpolation
5
LMFSHD = 82121, 12x Interpolation
5
LMFSHD = 82121, 16x Interpolation
5
LMFSHD = 42111 or 84111, 6x Interpolation
LMFSHD = 42111 or 84111, 8x Interpolation
16
16
LMFSHD = 42111 or 84111, 10x
Interpolation
15
15
13
15
LMFSHD = 42111 or 84111, 12x
Interpolation
LMFSHD = 42111 or 84111, 16x
Interpolation
LMFSHD = 42111 or 84111, 18x
Interpolation
LMFSHD = 42111 or 84111, 24x
Interpolation
15
8
JESD
clock
LMFSHD = 22210 or 44210, 8x Interpolation
SYSREF TO JESD LMFC RESET
cycles
LMFSHD = 22210 or 44210, 12x
Interpolation
7
LMFSHD = 22210 or 44210, 16x
Interpolation
6
7
5
4
9
LMFSHD = 22210 or 44210, 18x
Interpolation
LMFSHD = 22210 or 44210, 20x
Interpolation
LMFSHD = 22210 or 44210, 24x
Interpolation
LMFSHD = 12410 or 24410, 16x
Interpolation
LMFSHD = 12410 or 24410, 24x
Interpolation
7
29
27
LMFSHD = 44210 or 88210, 8x Interpolation
LMFSHD = 44210 or 88210, 12x
Interpolation
LMFSHD = 44210 or 88210, 16x
Interpolation
26
25
8
LMFSHD = 44210 or 88210, 24x
Interpolation
LMFSHD = 24410 or 48410, 16x
Interpolation
LMFSHD = 24410 or 48410, 24x
Interpolation
6
Copyright © 2017–2020, Texas Instruments Incorporated
13
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
7.7 Electrical Characteristics - AC Specifications
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, 0 dBFS, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise
noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Analog Output
fDAC Maximum DAC sample rate
AC Performance - CW
DAC38RF82 only
DAC38RF89 only
9
GSPS
8.4
9
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
63
62
58
57
62
61
61
54
51
97
93
88
77
94
90
85
82
79
72
71
74
71
69
69
72
71
67
72
65
57
57
71
65
62
54
51
Spurious Free Dynamic Range 0 –
fDAC/2
SFDR
SFDR
SFDR
HD2
dBc
dBc
dBc
dBc
Spurious Free Dynamic Range within
500 MHz fOUT ± 250 MHz
Spurious Free Dynamic Range
excluding HD2, HD3 and CMP2 0 –
fDAC/2
2nd Order Harmonic
14
Copyright © 2017–2020, Texas Instruments Incorporated
DAC38RF82, DAC38RF89
www.ti.com.cn
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
Electrical Characteristics - AC Specifications (continued)
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, 0 dBFS, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise
noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fCLK = 6 GHz , fOUT = 501 MHz
63
62
71
69
62
61
66
65
67
85
85
82
79
78
76
73
74
68
92
87
81
78
95
89
84
79
74
80
76
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz
fCLK = 6 GHz , fOUT = 951 MHz
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 ± 5 MHz, –6 dBFS each tone
fCLK = 6 GHz , fOUT = 951 ± 5 MHz, –6 dBFS each tone
HD3
3rd Order Harmonic
dBc
CMP2
Fs/2 clock mixing product (Fs/2 – fOUT
)
dBc
Fs/N (N = 4, 8, 16) clock mixing product
(fOUT ± Fs/N)
CMP4+
dBc
fCLK = 6 GHz , fOUT = 1851 ± 5 MHz, –6 dBFS each
tone
73
72
fCLK = 6 GHz , fOUT = 2651 ± 5 MHz, –6 dBFS each
tone
Third-order two-tone intermodulation
distortion
fCLK = 9 GHz , fOUT = 501 ± 5 MHz, –6 dBFS each tone
fCLK = 9 GHz , fOUT = 951 ± 5 MHz, –6 dBFS each tone
80
75
IMD3
dBc
fCLK = 9 GHz , fOUT = 1851 ± 5 MHz, –6 dBFS each
tone
70
70
68
fCLK = 9 GHz , fOUT = 2651 ± 5 MHz, –6 dBFS each
tone
fCLK = 9 GHz , fOUT = 3651 ± 5 MHz, –6 dBFS each
tone
Copyright © 2017–2020, Texas Instruments Incorporated
15
DAC38RF82, DAC38RF89
ZHCSGM6C –FEBRUARY 2017–REVISED APRIL 2020
www.ti.com.cn
Electrical Characteristics - AC Specifications (continued)
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, external differential clock mode at 9
GSPS, 12x Interpolation, 0 dBFS, fOUT = 2.14 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise
noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fCLK = 6 GHz , fOUT = 501 MHz
–170
fCLK = 6 GHz , fOUT = 951 MHz
–163
–157
–155
–172
–166
–157
–156
–153
–172
–164
–162
–162
–159
–172
–166
–157
–173
–167
–159
–155
–151
–169
–167
–162
–162
–157
82
fCLK = 6 GHz , fOUT = 1851 MHz
fCLK = 6 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 501 MHz
fCLK = 9 GHz , fOUT = 951 MHz
fCLK = 9 GHz , fOUT = 1851 MHz
fCLK = 9 GHz , fOUT = 2651 MHz
fCLK = 9 GHz , fOUT = 3651 MHz
fCLK = 6 GHz , fOUT = 501 MHz, –9 dBFS
fCLK = 6 GHz , fOUT = 951 MHz, –9 dBFS
fCLK = 6 GHz , fOUT = 1851 MHz, –9 dBFS
fCLK = 9 GHz , fOUT = 2651 MHz, –9 dBFS
fCLK = 9 GHz , fOUT = 3651 MHz, –9 dBFS
fCLK = 5 GHz , fOUT = 501 MHz
Noise Spectral Density > 50 MHz
offset(1)
NSD
dBFS/Hz
fCLK = 5 GHz , fOUT = 951 MHz
fCLK = 5 GHz , fOUT = 1851 MHz
fCLK = 7.5 GHz , fOUT = 501 MHz
fCLK = 7.5 GHz , fOUT = 951 MHz
fCLK = 7.5 GHz , fOUT = 1851 MHz
fCLK = 7.5 GHz , fOUT = 2651 MHz
fCLK = 7.5 GHz , fOUT = 3651 MHz
fCLK = 5 GHz , fOUT = 501 MHz, –9 dBFS
fCLK = 5 GHz , fOUT = 951 MHz, –9 dBFS
fCLK = 5 GHz , fOUT = 1851 MHz, –9 dBFS
fCLK = 7.5 GHz , fOUT = 2651 MHz, –9 dBFS
fCLK = 7.5 GHz , fOUT = 3651 MHz, –9 dBFS
fOUT = 1856 MHz
NSD
(on-chip
PLL)
Noise Spectral Density > 50 MHz offset
On-chip PLL enabled
dBFS/Hz
Isolation between DAC A and DAC B
analog output
Isolation
dBc
fOUT = 3105 MHz
73
(1) Also valid for on-chip PLL enabled in DAC38RF82
16
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7.8 PLL/VCO Electrical Characteristics
Typical values at TA = 25°C, full temperature range is TMIN = –40°C to TMAX = 85°C, internal PLL/VCO clock mode, 12x
Interpolation, fOUT = 1.8 GHz, I(OUTFS) = 40 mA, nominal supplies, LMFSHd = 84111, unless otherwise noted.
PARAMETER
TEST CONDITIONS
DAC38RF82
MIN TYP
DAC38RF89
UNIT
MAX
MIN
TYP
MAX
PLL/VCO
fref
Reference clock
frequency
100
100
fVCO
/4
100
100
fVCO
/4
MHz
MHz
MHz
MHz
KHz
fPFD
fvcoL
fvcoH
fBW
Frequency of phase &
frequency detector
500
6720
9000
500
5600
8400
Low VCO operating
frequency
5240
7960
500
4500
6600
High VCO operating
frequency
Loop filter bandwidth
500
Low VCO Phase Noise
600 KHz
-123
-132
-135
-146
Frequ
ency
1.2 MHz
fvco = 6 GHz,CP=5, fPFD = 500 MHz,
measured at output frequency = 1.8 GHz
1.8 MHz
Offset
6.0 MHz
dBc/Hz
600 KHz
-123
-132
-136
-147
Frequ
ency
1.2 MHz
fvco = 5 GHz,CP=5, fPFD = 312.5 MHz,
measured at output frequency = 1.8 GHz
1.8 MHz
Offset
6.0 MHz
High VCO Phase Noise
600 kHz
-123
-131
-135
-148
Frequ
ency
1.2 MHz
fvco = 9 GHz, CP=5, fPFD = 500 MHz,
measured at output frequency = 1.8 GHz
1.8 MHz
Offset
6.0 MHz
dBc/Hz
600 kHz
-124
-132
-136
-148
Frequ
ency
1.2 MHz
fvco = 7.5 GHz, CP=5, fPFD = 468.75 MHz,
measured at output frequency = 1.8 GHz
1.8 MHz
Offset
6.0 MHz
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7.9 Timing Requirements
MIN
NOM
MAX
UNIT
Digital Input Timing Specifications
Timing: SYSREF+/-
Setup time, SYSREF+/- valid to rising
edge of DACCLK+/-
ts(SYSREF)
SYSREF Capture assist disabled
SYSREF Capture assist disabled
50
50
ps
ps
Hold time, SYSREF+/- valid after rising
edge of DACCLK+/-
th(SYSREF)
Timing: Serial Port
ts(/SDEN)
ts(SDIO)
th(SDIO)
Setup time, SDEN to rising edge of SCLK
20
10
5
ns
ns
ns
µs
ns
ns
ns
Setup time, SDIO valid to rising edge of SCLK
Hold time, SDIO valid after rising edge of SCLK
temperature sensor read
All other registers
1
t(SCLK)
Period of SCLK
100
25
25
td(Data)
tRESET
Analog Output
Data output delay after falling edge of SCLK
Minimum RESET pulse width
ts(DAC)
Output settling time to 0.1%
1
50
50
ns
ps
ps
tr
Output rise time 10% to 90%
Output fall time 90% to 10%
tf
Latency
RX SerDes AnalogDelay
DAC wake-up time
250
90
ps
µs
IOUT current settling to 1% of IOUTFS
from deep sleep
IOUT current settling to less than 1% of
IOUTFS in deep sleep
DAC sleep time
90
µs
18
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7.10 Typical Characteristics
Unless otherwise noted, all plots are at TA = 25°C, nominal supply voltages, fDAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
180
174
168
162
156
150
144
138
132
126
120
180
174
168
162
156
150
144
138
132
126
120
-12dBFS
-9dBFS
-6dBFS
0dBFS
Iout=40mA
Iout=30mA
Iout=20mA
Iout=10mA
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D005
D011
Figure 1. NSD vs Output Frequency Over Input Scale
Figure 2. NSD vs Output Frequency Over Output Current
IoutFS
180
80
-12dBFS
-6dBFS
0dBFS
174
168
162
156
150
144
138
132
126
120
75
70
65
60
55
50
45
40
35
5 GHz VCO (DAC38RF89)
7.5GHz VCO (DAC38RF89)
6 GHz VCO (DAC38RF82)
9 GHz VCO (DAC38RF82)
9 GHz External clock
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D012
D002
Figure 3. NSD vs Output Frequency Over Clocking Option
Figure 4. HD2 vs Output Frequency Over Input Scale
80
90
85
80
75
70
65
60
55
50
45
40
35
Iout=10mA
5 GHz VCO (DAC38RF89)
7.5GHz VCO (DAC38RF89)
6 GHz VCO (DAC38RF82)
9 GHz VCO (DAC38RF82)
9 GHz External clock
75
70
65
60
55
50
45
40
35
Iout=20mA
Iout=30mA
Iout=40mA
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D010
D012
Figure 5. HD2 vs Output Frequency Over Output Current
IoutFS
Figure 6. HD2 vs Output Frequency Over Clocking Option
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Typical Characteristics (continued)
Unless otherwise noted, all plots are at TA = 25°C, nominal supply voltages, fDAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
80
75
70
65
60
55
50
45
40
35
105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
Iout=10mA
Iout=20mA
Iout=30mA
Iout=40mA
-12dBFS
-6dBFS
0dBFS
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D004
D024
Figure 7. HD3 vs Output Frequency Over Input Scale
Figure 8. HD3 vs Output Frequency Over Output Current
IoutFS
80
80
-12dBFS
-6dBFS
0dBFS
75
70
65
60
55
50
45
40
35
75
70
65
60
55
50
45
40
35
5 GHz VCO (DAC38RF89)
7.5GHz VCO (DAC38RF89)
6 GHz VCO (DAC38RF82)
9 GHz VCO (DAC38RF82)
9 GHz External clock
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D012
D001
Figure 9. HD3 vs Output Frequency Over Clocking Option
Figure 10. SFDR vs Output Frequency Over Input Scale
80
90
Iout=10mA
5 GHz VCO (DAC38RF89)
7.5GHz VCO (DAC38RF89)
6 GHz VCO (DAC38RF82)
9 GHz VCO (DAC38RF82)
9 GHz External clock
85
80
75
70
65
60
55
50
45
40
35
75
70
65
60
55
50
45
40
35
Iout=20mA
Iout=30mA
Iout=40mA
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D008
D012
Figure 11. SFDR vs Output Frequency Over Output Current
IoutFS
Figure 12. SFDR vs Output Frequency Over Clocking Option
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Typical Characteristics (continued)
Unless otherwise noted, all plots are at TA = 25°C, nominal supply voltages, fDAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
80
75
70
65
60
55
50
45
40
35
80
75
70
65
60
55
50
45
40
35
5 GHz VCO (DAC38RF89)
7.5GHz VCO (DAC38RF89)
6 GHz VCO (DAC38RF82)
9 GHz VCO (DAC38RF82)
9 GHz External clock
-18dBFS
-12dBFS
-6dBFS
0dBFS
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D006
D012
-18 dBFS digital backoff
Figure 13. IMD3 vs Output Frequency Over Input Scale
Figure 14. IMD3 vs Output Frequency Over Clocking Option
6
5
4
90
DAC A to B
DAC B to A
86
82
3
2
78
74
70
66
62
58
54
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
50
0
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
500 1000 1500 2000 2500 3000 3500 4000 4500
Output Frequency (MHz)
D000
D002
Figure 15. Power vs Output Frequency
Figure 16. Isolation vs Output Frequency
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Typical Characteristics (continued)
Unless otherwise noted, all plots are at TA = 25°C, nominal supply voltages, fDAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
-60
-80
-100
-120
-140
-160
CP=1
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
-80
-100
-120
-140
-160
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
D027
D003
VCO frequency = 8.85 GHz
Measured at 1.8 GHz
VCO frequency = 7.5 GHz
Measured at 1.8 GHz
Figure 17. DAC38RF82 VCO1 Phase Noise vs Offset
Frequency Over Charge pump current
Figure 18. DAC38RF89 VCO1 Phase Noise vs Offset
Frequency Over Charge pump current
-90
-90
div4
div3
div2
div4
div3
div2
-100
-110
-120
-130
-140
-150
-160
-100
-110
-120
-130
-140
-150
-160
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
D028
D004
VCO frequency = 8.85 GHz
VCO frequency = 7.5 GHz
Figure 19. DAC38RF82 VCO1 Output Clock Phase Noise vs
Offset frequency Over Divider Ratio
Figure 20. DAC38RF89 VCO1 Output Clock Phase Noise vs
Offset frequency Over Divider Ratio
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Typical Characteristics (continued)
Unless otherwise noted, all plots are at TA = 25°C, nominal supply voltages, fDAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
-80
-100
-120
-140
-160
-80
-100
-120
-140
-160
CP=1
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
CP=1
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
D029
D001
VCO frequency = 5.9 GHz
Measured at 1.8 GHz
VCO frequency = 5.0 GHz
Measured at 1.8 GHz
Figure 21. DAC38RF82 VCO0 Phase Noise vs Offset
Frequency Over Charge Pump Current
Figure 22. DAC38RF89 VCO0 Phase Noise vs Offset
Frequency Over Charge Pump Current
-100
-100
div4
div3
div2
div4
div3
div2
-110
-120
-130
-140
-150
-160
-110
-120
-130
-140
-150
-160
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
1000
10000
100000 1000000
Freq offset (Hz)
1E+7
5E+7
D030
D030
VCO frequency = 5.9 GHz
VCO frequency = 5.0 GHz
Figure 23. DAC38RF82 VCO0 Output clock Phase Noise vs
Offset Frequency Over Divider Ratio
Figure 24. DAC38RF89 VCO0 Output clock Phase Noise vs
Offset Frequency Over Divider Ratio
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8 Detailed Description
8.1 Overview
The DAC38RF82 and DAC38RF89 are high performance, wide bandwidth RF-sampling digital-to-analog (DACs)
that are capable of dual channel input data rate up to 3.33 GSPS or single-channel operation with 8-bits up to 9-
GSPS. The devices have a low power JESD204B Interface with up to 8 lanes, with a maximum bit rate of 12.5
Gbps. In dual channel operation, the input interface is capable of data rates up to 3.33 GSPS at 12-bits and 2.5
GSPS at 16-bits resolution without interpolation. When used as a complex baseband transmitter with
interpolation modes from 2x to 24x, the DAC38RF82 (or DAC38RF89) is capable of synthesizing wideband
signals up to 2 GHz bandwidth with 16-bit input resolution and 2.66 GHz bandwidth with 12-bit input resolution.
The 8-bit mode allows an input at the full 9 GSPS maximum DAC sample rate and can synthesize wideband
signals from 0 to 4.5 GHz. An optional low jitter PLL/VCO simplifies the DAC clock generation by allowing use of
a lower frequency reference clock. DAC38RF82 and DAC38RF89 support different VCO frequency ranges,
summarized in Device Comparison Table.
8.2 Functional Block Diagrams
DACCLK+
CLKTX+
Divider
/2, /3, /4
Low Jitter
PLL
Clock
Distribution
CLKTXœ
DACCLKœ
VDDTX1
DACCLKSE
Multi-band DUC Channel 2 (multi-DUC2)
NCO 3
VDDTX18
DACB
Gain
SYSREF+
I
SYSREFœ
Q
I
VOUT2+
14-b
DAC
x
sin(x)
RX[4..7]+
100 W
VOUT2œ
RX[4..7]œ
Q
SYNC2\+
SYNC2\œ
VDDT1
NCO 4
NCO 1
0.9 V
Ref
EXTIO
RBIAS
TESTMODE
VDDR18
I
RX[0..3]+
Q
I
VOUT1+
14-b
DAC
x
sin(x)
100 W
RX[0..3]œ
VOUT1œ
SYNC1\+
Q
VEE18N
VDDA18
ATEST
DACA
Gain
NCO 2
SYNC1\œ
VDDS18
Multi-band DUC Channel 1 (multi-DUC1)
AMUX0/1
IFORCE
Temp
Sensor
JTAG
Control Interface
VSENSE
Figure 25. 12-, 16-Bit Input Mode Block Diagram
24
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Functional Block Diagrams (continued)
DACCLK+
CLKTX+
Divider
/2, /3, /4
Low Jitter
PLL
Clock
Distribution
CLKTX-
DACCLK-
VDDTX1
DACCLKSE
VDDTX18
SYSREF+
SYSREF-
RX[4..7]+
RX[4..7]-
DACA
Gain
SYNC2\+
SYNC2\-
VOUT1+
VOUT1-
14-b
DAC
x
100W
sin(x)
8
VDDT1
VDDR18
RX[0..3]+
RX[0..3]-
0.9 V
Ref
EXTIO
RBIAS
TESTMODE
SYNC1\+
VEE18N
SYNC1\-
VDDS18
VDDA18
ATEST
AMUX0/1
IFORCE
Temp
Sensor
JTAG
Control Interface
VSENSE
Copyright © 2016, Texas Instruments Incorporated
Figure 26. 8-Bit Input Mode Block Diagram
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8.3 Feature Description
8.3.1 SerDes Inputs
The DAC38RF82 (or DAC38RF89) RX [0..7]+/- differential inputs are each internally terminated to a common
point via 50 Ω, as shown in Figure 27.
RXP
0.7V
50O
To
TERM
Equalizer
&
Samplers
=001
Level
Shift
TERM
=100
50pF
TERM
=101
50O
0.25V
RXN
Figure 27. Serial Lane Input Termination
Common mode termination is via a 50 pF capacitor to GND. The common mode voltage and termination of the
differential signal can be controlled in a number of ways to suit a variety of applications via field TERM in register
SRDS_CFG2 (8.5.87), as described in Table 1.
NOTE
AC coupling is recommended for JESD204B compliance.
Table 1. Receiver Termination Selection
TERM
EFFECT
000
Reserved
Common point set to 0.7 V. This configuration is for AC coupled systems. The transmitter has no effect on the
receiver common mode, which is set to optimize the input sensitivity of the receiver. Note: this mode is not
compatible with JESD204B.
001
01x
100
101
110
Reserved
Common point set to GND. This configuration is for applications that require a 0 V common mode.
Common point set to 0.25 V. This configuration is for applications that require a low common mode.
Reserved
Common point floating. This configuration is for DC coupled systems in which the common mode voltage is set by
the attached transmit link partner to 0 and 0.6 V. Note: this mode is not compatible with JESD204B
111
Input data is sampled by the differential sensing amplifier using clocks derived from the clock recovery algorithm.
The polarity of RX+ and RX- can be inverted by setting the bit of the corresponding lane in field INVPAIR in
register SRDS_POL (8.5.88) to “1”. This can potentially simplify PCB layout and improve signal integrity by
avoiding the need to swap over the differential signal traces.
Due to processing effects, the devices in the RX+ and RX- differential sense amplifiers will not be perfectly
matched and there will be some offset in switching threshold. The DAC38RF82 (or DAC38RF89) contains
circuitry to detect and correct for this offset. This feature can be enabled by setting ENOC in register
SRDS_CFG1 (8.5.86) to “1”. It is anticipated that most users will enable this feature.
8.3.2 SerDes Rate
The DAC38RF82 (or DAC38RF89) has eight configurable JESD204B serial lanes. The highest speed of each
SerDes lane is 12.5 Gbps. Because the primary operating frequency of the SerDes is determined by its reference
clock and PLL multiplication factor, there is a limit on the lowest SerDes rate supported. To support lower speed
application, each receiver should be configured to operate at half, quarter or eighth of the full rate via field RATE
in register SRDS_CFG2 (8.5.87). Refer to Table 2 for details.
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Table 2. Lane Rate Selection
RATE
00
EFFECT
Full rate. Four data samples taken per SerDes PLL output clock cycle.
Half rate. Two data samples taken per SerDes PLL output clock cycle.
Quarter rate. One data samples taken per SerDes PLL output clock cycle.
Eighth rate. One data samples taken every two SerDes PLL output clock cycles.
01
10
11
8.3.3 SerDes PLL
The DAC38RF82 (or DAC38RF89) has two integrated PLLs, one PLL is to provide the clocking of DAC, refer to
the DAC PLL section; the other PLL is to provide the clocking for the high speed SerDes. The reference
frequency of the SerDes PLL can be in the range of 100-800 MHz nominal, and 300-800 MHz optimal. The
reference frequency is derived from DACCLK divided down by the value in field SerDes_REFCLK_DIV in register
SRDS_CLK_CFG (8.5.84), as shown in Figure 28. Field SerDes_CLK_SEL in register SRDS_CLK_CFG (8.5.84)
determines if the DACCLK input or DAC PLL output is used as the source of the SerDes PLL reference. If the
DACCLK input is used, a pre-divider set by field SerDes_REFCLK_PREDIV in register SRDS_CLK_CFG
(8.5.84) should be used to reduce the frequency of the DACCLK.
SERDES_REFCLK_PREDIV
Predivider
DAC PLL
0
1
SERDES
PLL
REFCLK
DACCLK+
DACCLK-
divider
0
1
DACCLKSE
SERDES_REFCLK_DIV
SERDES_REFCLK_SEL
SEL_EXTCLK_DIFFSE
Figure 28. Reference Clock of SerDes PLL
During normal operation, the clock generated by PLL is 4-25 times the reference frequency, according to the
multiply factor selected via the field MPY] in register SRDS_PLL_CFG (8.5.85). In order to select the appropriate
multiply factor and reference clock frequency, it is first necessary to determine the required PLL output clock
frequency. The relationship between the PLL output clock frequency and the lane rate is determined by field
RATE in register SRDS_CFG2 (8.5.87) is shown in Table 3. Having computed the PLL output frequency, the
reference frequency can be obtained by dividing this by the multiply factor specified via MPY.
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Table 3. Relationship Between Lane Rate and SerDes PLL Output Frequency
RATE
00
LINE RATE
x Gbps
PLL OUTPUT FREQUENCY
0.25x GHz
01
x Gbps
0.5x GHz
10
x Gbps
1x GHz
11
x Gbps
2x GHz
Table 4. SerDes PLL Multiplier (MPY) Values
MPY
0x10
EFFECT
4x
0x14
5x
0x18
6x
0x20
8x
0x21
8.25x
10x
0x28
0x30
12x
0x32
12.5x
15x
0x3C
0x40
16x
0x42
16.5x
20x
0x50
0x58
22x
0x64
25x
Other codes
Reserved
The wide range of multiply factors combined with the different rate modes means it is often possible to achieve a
given line rate from multiple different reference frequencies. The configuration which utilizes the highest
reference frequency achievable is always preferable.
The SerDes PLL VCO must be in the nominal range of 1.5625 - 3.125 GHz. It is necessary to adjust the loop
filter depending on the operating frequency of the VCO. If the PLL output frequency is below 2.17 GHz, VRANGE
in register SRDS_PLL_CFG (8.5.84) should be set high.
Performance of the integrated PLL can be optimized according to the jitter characteristics of the reference clock
by setting the appropriate loop bandwidth via field LB in register SRDS_PLL_CFG (8.5.84). The loop bandwidth
is obtained by dividing the reference frequency by BWSCALE, where the BWSCALE is a function of both LB and
PLL output frequency as shown in Table 5.
Table 5. SerDes PLL Loop Bandwidth Selection
LB
EFFECT
BWSCALE vs PLL OUTPUT FREQUENCY
3.125 GHz
2.17 GHz
1.5625 GHz
00
01
10
11
Medium loop bandwidth
Ultra high loop bandwidth
Low loop bandwidth
13
7
14
8
16
8
21
10
23
11
30
14
High loop bandwidth
An approximate loop bandwidth of 8 – 30 MHz is suitable and recommended for most systems where the
reference clock is via low jitter clock input buffer. For systems where the reference clock is via a low jitter input
cell, but of low quality, an approximate loop bandwidth of less than 8 MHz may offer better performance. For
systems where the reference clock is cleaned via an ultra-low jitter LC-based cleaner PLL, a high loop bandwidth
up to 60 MHz is more appropriate. Note that the use of ultra-high loop bandwidth setting is not recommended for
PLL multiply factor of less than 8.
28
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A free running clock output is available when field ENDIVCLK in register SRDS_PLL_CFG (8.5.85) is set high. It
runs at a fixed divided-by-80 of the PLL output frequency and can be output on the ALARM pin by setting field
DTEST to “0001” (lanes 0 – 3) or “0010” (lanes 4 – 7) in register DTEST (8.5.76).
8.3.4 SerDes Equalizer
All channels of the DAC38RF82 (or DAC38RF89) incorporate an adaptive equalizer, which can compensate for
channel insertion loss by attenuating the low frequency components with respect to the high frequency
components of the signal, thereby reducing inter-symbol interference. Figure 29 shows the response of the
equalizer, which can be expressed in terms of the amount of low frequency gain and the frequency up to which
this gain is applied (i.e., the frequency of the ’zero’). Above the zero frequency, the gain increases at 6 dB/octave
until it reaches the high frequency gain.
dB
6
-6.3
Log10MHz
108
414
Frequency
Figure 29. Equalizer Frequency Response
The equalizer can be configured via fields EQ and EQHLD in register SRDS_CFG1 (8.5.86). Table 6 and Table 7
summarize the options. When enabled, the receiver equalization logic analyzes data patterns and transition times
to determine whether the low frequency gain should be increased or decreased. The decision logic is
implemented as a voting algorithm with a relatively long analysis interval. The slow time constant that results
reduces the probability of incorrect decisions but allows the equalizer to compensate for the relatively stable
response of the channel. The lock time for the adaptive equalizer is data dependent, and so it is not possible to
specify a generally applicable absolute limit. However, assuming random data, the maximum lock time will be
6x106 divided by the CDR activity level. For field CDR in register SRDS_CFG1 (8.5.86) = 110, the activity level
is 1.5 x 106 UI.
When EQ[2] = 0, finer control of gain boost is available using the EQBOOST IEEE1500 tuning chain field, as
shown in Table 6.
Table 6. Receiver Equalization Configuration
EQ
EFFECT
No equalization. The equalizer provides a flat response at the maximum gain. This setting may be
appropriate if jitter at the receiver occurs predominantly as a result of crosstalk rather than
frequency dependent loss.
00
01
10
11
Fully adaptive equalization. The zero position is determined by the selected operating rate, and the
low frequency gain of the equalizer is determined algorithmically by analyzing the data patterns and
transition positions in the received data. This setting should be used for most applications.
[1-0]
Precursor equalization analysis. The data patterns and transition positions in the received data are
analyzed to determine whether the transmit link partner is applying more or less precursor
equalization than necessary.
Postcursor equalization analysis. The data patterns and transition positions in the received data are
analyzed to determine whether the transmit link partner is applying more or less post-cursor
equalization than necessary.
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Table 6. Receiver Equalization Configuration (continued)
EQ
EFFECT
0
1
Default
[2]
Boost. Equalizer gain boosted by 6 dB, with a 20% reduction in bandwidth, and an increase of
5mW power consumption. May improve performance over long links.
Table 7. Receiver Equalizer Hold
EQHOLD
EFFECT
Equalizer adaption enabled. The equalizer adaption and analysis algorithm is enabled. This should be the default
state.
0
Equalizer adaption held. The equalizer is held in its current state. Additionally, the adaption and analysis algorithm
is reset.
1
Table 8. Relationship Between Lane Rate and SerDes PLL Output Frequency
EQBOOST
GAIN BOOST (dB)
BANDWIDTH CHANGE (%)
POWER INCREASE (mW)
00
01
01
11
0
2
4
6
0
0
0
5
5
-30
10
-20
When EQ is set to 010 or 011, the equalizer is reconfigured to provide analytical data about the amount of pre
and post cursor equalization respectively present in the received signal. This can in turn be used to adjust the
equalization settings of the transmitting link partner, where a suitable mechanism for communicating this data
back to the transmitter exists. Status information is provided by setting field DTEST in register DTEST (8.5.76) to
“0111” for EQOVER and “0110” for EQUNDER. The procedure is as follows:
1. Enable the equalizer by setting fields EQHLD low and EQ to “001” (register SRDS_CFG1 8.5.86). Allow
sufficient time for the equalizer to adapt;
2. Set EQHLD to 1 to lock the equalizer and reset the adaption algorithm. This also causes both EQOVER and
EQUNDER to become low;
3. Wait at least 48 UI, and proportionately longer if the CDR activity is less than 100%, to ensure the 1 on
EQHLD is sampled and acted upon;
4. Set EQ to “010” or “011”, and EQHLD to 0. The equalization characteristics of the received signal are
analysed (the equalizer response will continue to be locked);
5. Wait at least 150×103 UI to allow time for the analysis to occur, proportionately longer if the CDR activity is
less than 100%;
6. Examine EQOVER and EQUNDER for results of analysis
–
–
If EQOVER is high, it indicates the signal is over equalized;
If EQUNDER is high, it indicates the signal is under equalized;
7. Set EQHLD to 1;
8. Repeat items 3–7 if required;
9. Set EQ to “001”, and EQHLD to 0 to exit analysis mode and return to normal adaptive equalization.
NOTE
When changing EQ from one non-zero value to another, EQHLD must already be 1. If this
is not the case, there is a chance the equalizer could be reset by a transitory input state
(i.e., if EQ is momentarily 000). EQHLD can be set to 0 at the same time as EQ is
changed.
As the equalizer adaption algorithm is designed to equalize the post cursor, EQOVER or
EQUNDER will only be set during post cursor analysis if the amount of post cursor
equalization required is more or less than the adaptive equalizer can provide.
30
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8.3.5 JESD204B Descrambler
The descrambler is a 16-bit parallel self-synchronous descrambler based on the polynomial 1 + x14 + x15. From
the JESD204B specification, the scrambling/descrambling process only occurs on the user data, not on the code
group synchronization or the ILA sequence. Each multi-DUC has a separate descrambler that can be enabled
independently. The descrambler is enabled by field SCR in the multi-DUC paged register JESD_N_HD_SCR
(8.5.49).
8.3.6 JESD204B Frame Assembly
The DAC38RF82 (or DAC38RF89) may be programmed as a single or dual DAC device, with one JESD RX
block designated for each DAC. The two JESD RX blocks can be programmed to operate as two separate links
or as a single link.
The JESD204B defines the following parameters:
•
•
•
•
•
•
L is the number of lanes
M is the number of I or Q streams per device (2 = 1 IQ pair, 4 = 2 IQ pairs, 8 = 4 IQ pairs)
F is the number of octets per frame clock period
S is the number of samples per frame
HD is the High-Density bit which controls whether a sample may be divided over more lanes
N = NPRIME is the number of bits per sample (12 or 16 - bits)
Fields K and L are found in multi-DUC paged register JESD_K_L (8.5.46), M and S in multi-DUC paged register
JESD_M_S (8.5.48), and N, NPRIME and HD in multi-DUC paged register JESD_N_HD_SCR (8.5.49).
Table 9 lists the available JESD204B formats, interpolation rates and sample rate limits for the DAC38RF82 (or
DAC38RF89). The ranges are limited by the SerDes PLL VCO frequency range, the SerDes PLL reference clock
range, the maximum SerDes line rate, and the maximum DAC sample frequency. Table 10 through Table 27 lists
the frame formats for each mode. In the frame format tables, i CH (N) [x:y] and q CH (N) [x:y] are bits x through y
of the I and Q samples at time N of DUC channel CH. If [x..y] is not listed, the full sample is assumed. For
example, i0(0)[15:8] are bits 15 – 8 of the I sample at time 0, and q(1) is the full Q sample at time 1.
Table 9. JESD204B Formats for DAC38RF82 and DAC38RF89
L-M-F-S-Hd
1 TX
L-M-F-S-Hd
2 TX
Input
Resolution
IQ pairs per
DAC
Input rate
max (MSPS)
fDAC Max
(MSPS)
Frame Format
Interp
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
1500
1125
750
9000
9000
9000
9000
7500
9000
9000
9000
9000
9000
9000
5000
7500
9000
9000
9000
9000
5000
7500
8
82121
42111
NA
1 TX: Table 10
12
16
6
562.5
1250
1125
900
8
10
12
16
18
24
8
1 TX: Table 11
2 TX: Table 12
84111
750
562.5
500
375
625
12
16
18
20
24
16
24
625
562.5
500
1 TX: Table 13
2 TX: Table 14
22210
12410
44210
24410
450
375
312.5
312.5
1 TX: Table 15
2 TX: Table 16
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Table 9. JESD204B Formats for DAC38RF82 and DAC38RF89 (continued)
L-M-F-S-Hd
1 TX
L-M-F-S-Hd
2 TX
Input
Resolution
IQ pairs per
DAC
Input rate
max (MSPS)
fDAC Max
(MSPS)
Frame Format
Interp
16
16
16
16
16
16
2
2
2
2
2
2
8
625
625
5000
7500
9000
9000
5000
7500
12
16
24
16
24
1 TX: Table 17
2 TX: Table 18
44210
24410
88210
48410
562.5
375
312.5
312.5
1 TX: Table 19
2 TX: Table 20
1 TX: Table 21
2 TX: Table 22
24310
81180
48310
NA
12
8
2
24
375
9000
1 TX: Table 23
real input
1
1
2
1
2
4
9000
3333
3333
2500
2500
2250
9000
3333
6666
2500
5000
9000
1 TX: Table 24
2 TX: Table 25
41380
82380
12
real input(1)
1 TX: Table 26
2 TX: Table 27
41121
82121
16
real input(1)
(1) Can also be used as I-Q pair per 2 DACs. See description in Wideband DUC (wide-DUC)
Table 10. JESD204B Frame Format for LMFSHd = 82121
# un bits
# en bits
Nibble
4
5
1
8
10
2
lane RX0
lane RX1
lane RX2
lane RX3
lane RX4
lane RX5
lane RX6
lane RX7
i0[15:8]
i0[7:0]
i1[15:8]
i1[7:0]
q0[15:8]
q0[7:0]
q1[15:8]
q1[7:0]
Table 11. JESD204B Frame Format for LMFSHd = 42111
# un bits
# en bits
Nibble
4
5
1
8
10
2
lane RX0
lane RX1
lane RX2
lane RX3
i0[15:8]
i0[7:0]
q0[15:8]
q0[7:0]
Table 12. JESD204B Frame Format for LMFSHd = 84111
# un bits
# en bits
Nibble
4
5
1
8
10
2
lane RX0
lane RX1
A-i0[15:8](1)
A-i0[7:0](2)
(1) DAC A, I sample 0, MSB byte
(2) DAC A, I sample 0, LSB byte
32
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Table 12. JESD204B Frame Format for LMFSHd = 84111 (continued)
lane RX2
lane RX3
lane RX4
lane RX5
lane RX6
lane RX7
A-q0[15:8]
A-q0[7:0]
B-i0[15:8]
B-i0[7:0]
B-q0[15:8]
B-q0[7:0]
Table 13. JESD204B Frame Format for LMFSHd = 22210
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
lane RX0
lane RX1
i0
q0
Table 14. JESD204B Frame Format for LMFSHd = 44210
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
lane RX0
lane RX1
lane RX2
lane RX3
A-i0(1)
A-q0
B-i0
B-q0
(1) DAC A, I sample 0
Table 15. JESD204B Frame Format for LMFSHd = 12410
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
20
25
5
24
30
6
28
35
7
32
40
8
lane RX0
i0
q0
Table 16. JESD204B Frame Format for LMFSHd = 24410
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
20
25
5
24
30
6
28
35
7
32
40
8
lane RX0
lane RX1
A-i0(1)
B-i0
A-q0
B-q0
(1) DAC A, I sample 0
Table 17. JESD204B Frame Format for LMFSHd = 44210
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
lane RX0
lane RX1
lane RX2
A1-i0(1)
A1-q0(2)
A2-i0
(1) DAC A, MultiDUC 1, I sample 0
(2) DAC A, MultiDUC 2, I sample 0
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Table 17. JESD204B Frame Format for LMFSHd = 44210 (continued)
lane RX3
A2-q0
Table 18. JESD204B Frame Format for LMFSHd = 88210
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
lane RX0
lane RX1
lane RX2
lane RX3
lane RX4
lane RX5
lane RX6
lane RX7
A1-i0(1)
A1-q0
A2-i0
A2-q0
B1-i0
B1-q0
B2-i0
B1-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 19. JESD204B Frame Format for LMFSHd = 24410
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
20
25
5
24
30
6
28
35
7
32
40
8
lane RX0
lane RX1
A1-i0(1)
A2-i0
A1-q0
A2-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 20. JESD204B Frame Format for LMFSHd = 48410
# un bits
# en bits
Nibble
4
5
1
8
10
2
12
15
3
16
20
4
20
25
5
24
30
6
28
35
7
32
40
8
lane RX0
lane RX1
lane RX2
lane RX3
A1-i0(1)
A2-i0
A1-q0
A2-q0
B1-q0
B2-q0
B1-i0
B2-i0
(1) DAC A, MultiDUC 1, I sample 0
Table 21. JESD204B Frame Format for LMFSHd = 24310
# un bits
# en bits
Nibble
4
5
1
8
10
12
15
3
16
20
4
20
25
5
24
30
6
2
lane RX0
lane RX1
A1-i0(1)
A1-q0
A2-q0
A2-i0
(1) DAC A, MultiDUC 1, I sample 0
Table 22. JESD204B Frame Format for LMFSHd = 48310
# un bits
# en bits
4
5
8
12
15
16
20
20
25
24
30
10
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Table 22. JESD204B Frame Format for LMFSHd = 48310 (continued)
Nibble
1
2
3
4
5
6
lane RX0
lane RX1
lane RX2
lane RX3
A1-i0(1)
A2-i0
B1-i0
B2-i0
A1-q0
A2-q0
B1-q0
B2-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 23. JESD204B Frame Format for LMFSHd = 81180
# un bits
# en bits
Nibble
4
5
1
8
10
2
lane RX0
lane RX1
lane RX2
lane RX3
lane RX4
lane RX5
lane RX6
lane RX7
A0(1)
A1
A2
A3
A4
A5
A6
A7
(1) DAC A, sample 0
Table 24. JESD204B Frame Format for LMFSHd = 41380
# un bits
# en bits
Nibble
lane 0
4
5
1
8
10
12
15
3
16
20
4
20
25
24
30
6
2
5
A-0(1)
A-2
A-4
A-6
A-1
A-3
A-5
A-7
lane 1
lane 2
lane 3
(1) DAC A, sample 0
Table 25. JESD204B Frame Format for LMFSHd = 82380
# un bits
# en bits
Nibble
lane 0
lane 1
lane 2
lane 3
lane 4
lane 5
lane 6
lane 7
4
5
1
8
12
15
3
16
20
4
20
25
24
30
6
10
2
5
i(0)
i(2)
i(4)
i(6)
q(0)
q(2)
q(4)
q(6)
i(1)
i(3)
i(5)
i(7)
q(1)
q(3)
q(5)
q(7)
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Table 26. JESD204B Frame Format for LMFSHd = 41121
# un bits
# en bits
Nibble
lane 0
4
5
1
8
10
2
A-0[15:8](1)
A-0[7:0](2)
A-1[15:8]
A-1[7:0]
lane 1
lane 2
lane 3
(1) DAC A, sample 0, MSB byte
(2) DAC A, sample 0, LSB byte
Table 27. JESD204B Frame Format for LMFSHd = 82121
# un bits
# en bits
Nibble
4
5
1
8
10
2
lane RX0
lane RX1
lane RX2
lane RX3
lane RX4
lane RX5
lane RX6
lane RX7
A-0[15:8](1)
A-0[7:0](2)
A-1[15:8]
A-1[7:0]
B-0[15:8]
B-0[7:0]
B-1[15:8]
B-1[7:0]
(1) DAC A, sample 0, MSB byte
(2) DAC A, sample 0, LSB byte
36
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8.3.7 SYNC Interface
The DAC38RF82 (or DAC38RF89) JESD204B interface has two differential SYNC outputs called SYNC0 and
SYNC1 to support one or two links. Alternatively, GPO0 and GPO1 can be used to output SYNC as a single-
ended CMOS level. Each of the differential or CMOS outputs is enabled by a 2-bit register (fields GPO0_SEL,
GPO1_SEL, SYNC0B_SEL, SYNC1B_SEL in register IO_CONFIG 8.5.2), with bit 0 enabling multi-DUC1 SYNC
and bit 1 enabling multi-DUC2 SYNC. If both are enabled, the SYNC\ signals are OR’ed.
The SYNC signal can be asserted low by the receiver either to make a synchronization request to
initialize/reinitialize the link or to report an error to the transmitter. Synchronization requests must have a
minimum duration of five frames plus nine octets rounded up to the nearest whole number of frames. To report
an error, the SYNC signal is asserted for exactly two frames. The transmitter interprets any negative edge of its
SYNC input as an error and any SYNC assertion lasting four frames or longer as a synchronization request. See
the following sections in the standard for more details.
•
•
•
7.6.3 Errors requiring re-initialization
7.6.4 Error reporting via SYNC interface
8.4 SYNC signal decoding
8.3.8 Single or Dual Link Configuration
The DAC38RF82 (or DAC38RF89) JESD204B interface can be configures with one or two links. The advantage
of using two links, one for each DAC, is that one link can be re-established without affecting the other link and
DAC.
The configuration for each mode of operation are:
1. Dual DAC, dual link
a. Program fields OCTETPATH0_SEL to OCTETPATH7_SEL in multi-DUC paged registers
JESD_CROSSBAR1 (8.5.57) and JESD_CROSSBAR2 (8.5.58) so that each multi-DUC will pick data off
of the appropriate SerDes lane.
b. Appropriate bits in field LANE_ENA in multi-DUC paged register JESD_LN_EN (8.5.45) must be set for
each multi-DUC enable the lanes used.
c. Field ONE_DAC_ONLY in register RESET_CONFIG (8.5.1) should be ‘0’ (default).
2. Dual DAC, single link
a. Program OCTETPATH0_SEL to OCTETPATH7_SEL in multi-DUC paged registers JESD_CROSSBAR1
(8.5.57) and JESD_CROSSBAR2 (8.5.58) so that each multi-DUC will pick data off the appropriate
SerDes lane.
b. Appropriate bits in field LANE_ENA in multi-DUC paged register JESD_LN_EN (8.5.45) must be set for
each multi-DUC enable the lanes used.
c. Set field ONE_LINK_ONLY to ‘1’ to configure TXENABLE output.
3. Single DAC, single link
a. Set Field ONE_DAC_ONLY in register RESET_CONFIG (8.5.1) to ‘1’ to gate clocks to unused multi-
DUC2 for power savings.
b. ONE_LINK_ONLY bit does not matter in this case.
8.3.9 Multi-Device Synchronization
In many applications, such as multi antenna systems where the various transmit channels information is
correlated, it is required that the latency across the link is deterministic and multiple DAC devices are completely
synchronized such that their outputs are phase aligned. The DAC38RF82 (or DAC38RF89) achieves the
deterministic latency using SYSREF (JESD204B Subclass 1).
SYSREF is generated from the same clock domain as DACCLK. After having resynchronized its local multiframe
clock (LMFC) to SYSREF, the DAC will request a link re-initialization via SYNC interface. Processing of the
signal on the SYSREF input can be enabled and disabled via the SPI interface.
The SYSREF capture circuit and the timing requirements relative to device clock are described in SYSREF
Capture Circuit.
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8.3.10 SYSREF Capture Circuit
The JESD204B standard for Device Subclass 1 introduces a SYSREF signal that can be used as a global timing
reference to align the phase of the internal local multiframe clock (LMFC) and frame clock across multiple
devices. This allows the system to achieve deterministic latency and align data samples across several data
converters. The SYSREF signal accomplishes this goal by identifying a device clock edge for each chip that can
be used as an alignment reference. In particular, the LMFC and frame clock align to the device clock edge upon
which the SYSREF transition from “0” to “1” is sampled. SYSREF may be periodic, one-shot, or “gapped”
periodic and its period must be a multiple of the LMFC period.
Figure 30. SYSREF Signal Timing
With high-speed device clocks, the phase of the SYSREF signals relative to the device clock must meet the
setup/hold time requirements of each individual device clock. Historically, this has been done by controlling the
board-level routing delay and/or employing commercial clock distribution capable of generating device clocks and
SYSREF signals with programmable delays and with the option of splitting SYSREF into multiple SYSREFS,
each with its own fine-tuned delay. Since the DAC38RF82 (or DAC38RF89) supports device clock frequencies
up to 9 GHz, a SYSREF capture circuit is includes in the DAC38RF82 (or DAC38RF89) that allows a relaxation
in meeting the device clock setup and hold.
The SYSREF capture circuit provides:
•
•
•
•
tolerance to manufacturing and environmental variations in SYSREF phase
immunity to sampling errors due to setup/hold/meta-stability
information about phase of SYSREF relative to DAC clock inside the data converter
software compensation for phase misalignment due to PCB design errors
The concepts behind the SYSREF capture scheme are illustrated in Figure 31.
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Figure 31. SYSREF Capture Strategy and Phase Tolerance Windows
To understand Figure 31, to begin with we’ll ignore the SYSREF phase tolerance windows in the lower portion of
the figure and focus on the blue clock waveform at the top of the figure. This waveform represents the device
clock input to a particular DAC chip. The green arrows, labeled “R” and “F”, correspond to the rising and falling
edges of this clock (ignoring for the moment the additional arrows labeled “ER” and "EF”). While previous
devices with lower device clocks captured SYSREF only on the rising edge of the device clock, the new scheme
samples SYSREF on the falling edge as well, which provides more flexibility when optimizing the setup and hold
time of the SYSREF capture path. Moreover, each time a rising SYSREF edge is captured, the chip remembers
the clock phase during which the event occurred, and the system designer can later read back the phase
information to observe the SYSREF timing relative to the device clock at the internal capture point. If SYSREF
transitions close to the rising or falling clock edge sampling points the capture flop setup and hold time may not
be met and the observed phase may be unreliable and subject to meta-stability phenomenon.
To reduce the sensitivity to setup/hold/meta-stability concerns an “early” version of the device clock is generated
within the DAC and additional SYSREF samples are taken at the “early falling” and “early rising” edges of the
clock (labeled “EF” and “ER”, respectively, in Figure 31). The resulting set of four samples is used to narrow
down the timing of the rising SYSREF edge to one of four possible clock phases. If the rising SYSREF transition
takes place between the “EF” and “F” samples, then SYSREF is said to occur in phase θ1. Similarly, if it takes
place between the “F” and “ER” samples, then it is said to occur in phase θ2. If SYSREF transitions between the
“ER” and “R” samples, then it is said to occur in phase θ3. And, finally, if the SYSREF rising edge event happens
between the “R” and “EF” samples, then it is said to occur in phase θ4. As mentioned before, the chip
remembers all observed SYSREF phases and the user can later read them back. Since the delay between
“early” and “on time” versions of the clock is intentionally chosen to be larger than the setup/hold/meta-stability
window, at most one of the four samples can be affected even when the SYSREF transitions right at one of the
four sampling points. Thus, the uncertainty in the observed SYSREF timing is limited to adjacent phases, and
with twice as many sampling phases the resolution of the timing information is improved by a factor of two.
Referring to the lower portion of Figure 31, the user can now see how this information regarding the observed
SYSREF phases is used to devise a reliable SYSREF capture methodology with a high degree of tolerance to
manufacturing and environmental variations in SYSREF phase. Based on the SYSREF phases observed for a
particular DAC chip during system characterization, the system designer can select one of four so-called “phase
tolerance window” options (denoted “’00”, “01”, “10”, and “11”) to maximize immunity to manufacturing and
environmental variations. For example, consider the default phase tolerance window labeled “window=00” in the
figure. If, during characterization, the system designer observes (by reading back the recorded phase
observations) that the rising SYSREF edge nominally occurs in either θ1 or θ2 or both (i.e. θ12) then he would
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program that particular DAC chip to use phase tolerance window “00”. This mapping is indicated in the figure
with the label “θ1|θ12|θ2: window=00”. Having programmed the device to use window “00”, all future SYSREF
events that occur in θ1 or θ2 would trigger the LMFC and frame clock to be aligned using the following rising
clock edge as the alignment reference (as indicated by the red arrow pointing to rising clock edge “R” and
labeled “Window=00/01 alignment edge”).
The full extent of each phase tolerance window is indicated in the figure using “box and whisker” plots. For the
“window=00” example, the “box” portion of the plot indicates that the phase tolerance window is centered on θ12
(to be precise on the boundary between θ1 and θ2) and the “whisker” portion indicates that even if the rising
edge of SYSREF occurs as early as the preceding θ4 or as late as the following θ3 it still results in LMFC and
frame clock alignment to the same rising clock edge indicated by the red arrow labeled “Window=00/01
alignment edge”. When programmed for phase tolerance window “00”, the DAC chip is tolerant to variations in
the SYSREF timing ranging from a rising SYSREF edge that occurs just after one rising edge of clock to just
before the next rising edge of the clock. The qualifying phrases “just after” and “just before” are used here to
indicate that the SYSREF transition must occur far enough away from the rising edges of the clock to avoid
setup/hold violations and prevent the device from concluding that the SYSREF transition has crossed out off the
phase tolerance window when in fact it has not. The tolerance range for window “00” is from rising clock edge to
rising clock edge and is indicated in the figure by the green text labeled “tolerance = R↔R”.
Following the above example, if characterization reveals SYSREF timing centered on θ23 then phase tolerance
window “01” (with tolerance for SYSREF rising edge events from EF to EF) should be chosen. Notice that this
option is tolerant even to rising SYSREF edges that occur after the rising device clock edge (i.e. in θ4) and will
treat them just as if they had occurred in one of the earlier three phases, aligning to the same rising device clock
edge indicated by the red arrow labeled “Window=00/01 Alignment Edge”. This allows the system designer to
tolerate PCB design errors and/or environmental and manufacturing variations – achieving his intended
alignment without having to make physical changes to the board to adjust the SYSREF timing.
Similarly, if characterization indicates that SYSREF timing is centered on θ34 or θ41 then phase tolerance
window “10” or “11” can be selected, resulting in tolerance for “F↔F” or “ER↔ER” SYSREF timing, respectively.
Note, however, that in these two cases the alignment reference edge is by default taken to be the subsequent
rising edge of the device clock. Since this may not be the desired behavior, the DAC38RF82 (or DAC38RF89)
allows the user to program in an optional alignment offset of θ1 if the default offset of 0 does not achieve the
desired alignment. This feature is illustrated in Figure 32 where the user can see that by setting the alignment
offset to -1, phase tolerance windows “10” and “11” can be made to trigger alignment to the earlier rising device
clock edge used by windows “00” and “01”. Alternatively, the window “00” and “01” alignment edge can be
pushed one cycle later by setting their alignment offset to +1.
Figure 32. Optional SYSREF Alignment Offset
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Several important controls related to SYSREF alignment and capture timing are contained in register
SYSR_CAPTURE (8.5.78). For example, as mentioned before, the device is capable of monitoring the observed
phases of the rising SYSREF edge events; however, in order to avoid unwanted noise coupling from the
SYSREF circuits into the DAC output, the SYSREF monitoring circuits are disabled by default. Field
SYSR_STATUS_ENA enables SYSREF status monitoring. Field SYSR_PHASE_WDW contains the the phase
tolerance window selected for normal operation, which is optimized during characterization. Field
SYSR_ALIGN_DLY contains the control that allows the system designer to optionally offset the SYSREF
alignment event by ±1 device clock cycles. Field SYSR_STATUS_ENA enables the SYSREF capture alignment
accumulation and will generate alarms when enabled. Writing a “1” to field SYSR_ALIGN_SYNC clears the
accumulated SYSREF alignment statistics. The SYSREF alignment block can be bypassed completely by field
SYSREF_BYPASS_ALIGN, in which case SYSREF is latched by the rising edge of DACCLK.
When field SYSR_STATUS_ENA is high the device records the phase associated with each SYSREF event for
use in characterizing the SYSREF capture timing and selecting an appropriate phase tolerance window. The
phase data is available in two forms. First, each of the four phases has a corresponding “sticky” alarm flag
indicating which phases have been observed since the last time the register was cleared. In addition, the device
also accumulates statistics on the relative number of occurrences of each phase spanning multiple SYSREF
events using saturating 8-bit counters. These accumulated real-time SYSREF statistics allow us to account for
time-varying effects during characterization such as potential timing differences between the 1st and Nth edges
in a “gapped” SYSREF pulse train. The counters are fields PHASE1_CNT and PHASE2_CNT in register
SYSREF12_CNT (8.5.10), PHASE3_CNT and PHASE4_CNT in register SYSREF34_CNT (8.5.11), and
ALIGN_TO_R1_CNT and ALIGN_TO_R3_CNT in register SYSREF_ALIGN_R (8.5.9).
The accumulated SYSREF statistics can be cleared by writing ‘1’ to SYSR_ALIGN_SYNC. This sync signal
affects only the SYSREF statistics monitors and does not cause a sync of any other portions of the design.
Before collecting phase statistics, the user must first enable the SYSREF status monitoring logic by setting the
SYSR_STATUS_ENA bit. The user must then generate
a repeating SYSREF input before using
SYSR_ALIGN_SYNC to clear the statistic counters. This is necessary to flush invalid data out of the status
pipeline.
The “sticky” alarm flags indicating which of the four phases have been observed since the last
SYSR_ALIGN_SYNC write of ‘1’ are fields ALM_SYSRPHASE1 to ALM_SYSRPHASE4 and are contained in the
ALM_SYSREF_DET register (8.5.6).
8.3.11 JESD204B Subclass 0 Support
Some functionality has been implemented to support Subclass 0 operation. Note that programming the
SUBCLASSV configuration parameter has no functional impact on the logic. The value programmed for
SUBCLASSV is only used in the initial lane alignment (ILA) sequence. The following configuration parameters
are used to support Subclass 0 operation:
•
•
•
Field SYSREF_MODE in register JESD_SYSR_MODE (8.5.56) = 0
Field DISABLE_ERR_RPT in register JESD_ERR_OUT (8.5.53) = 1
Field MIN_LATENCY_ENA in register JESD_MATCH (8.5.50) = 1
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8.3.12 SerDes Test Modes through Serial Programming
The DAC38RF82 (or DAC38RF89) supports a number of basic pattern generation and verification of SerDes via
the serial interface. Three pseudo random bit stream (PRBS) sequences are available, along with an alternating
0/1 pattern and a 20-bit user-defined sequence. The 27 - 1, 231 - 1 or 223 – 1 sequences implemented can often
be found programmed into standard test equipment, such as a Bit Error Rate Tester (BERT). Pattern generation
and verification selection is via field TESTPATT in register SRDS_CFG1 (8.5.86), as shown in Table 28.
Table 28. SerDes Test Pattern Selection
TESTPATT
000
EFFECT
Test mode disabled.
001
Alternating 0/1 Pattern. An alternating 0/1 pattern with a period of 2 UI.
010
Verify 27 - 1 PRBS. Uses a 7-bit LFSR with feedback polynomial x7 + x6 + 1.
011
Verify 223 - 1 PRBS. Uses an ITU O.150 conformant 23-bit LFSR with feedback polynomial x23 + x18 + 1.
Verify 231 - 1 PRBS. Uses an ITU O.150 conformant 31-bit LFSR with feedback polynomial x31 + x28 + 1.
100
User-defined 20-bit pattern. Uses the USR PATT IEEE1500 Tuning instruction field to specify the pattern. The default
value is 0x66666.
101
11x
Reserved.
Pattern verification compares the output of the serial to parallel converter with an expected pattern. When there
is a mismatch, the TESTFAIL bit is driven high, which can be programmed to come out the ALARM terminal by
setting field DTEST in register DTEST (8.5.76) to “0011”.
8.3.13 SerDes Test Modes through IEEE 1500 Programming
DAC38RF82 (or DAC38RF89) also provide a number of advanced diagnostic capabilities controlled by the IEEE
1500 interface. These are:
•
•
•
Accumulation of pattern verification errors;
The ability to map out the width and height of the receive eye, known as Eye Scan;
Rreal-time monitoring of internal voltages and currents;
The SerDes blocks support the following IEEE1500 instructions:
Table 29. IEEE1500 Instruction for SerDes Receivers
INSTRUCTION
OPCODE
DESCRIPTION
Bypass. Selects a 1-bit bypass data register. Use when accessing other macros on the same
IEEE1500 scan chain.
ws_bypass
0x00
ws_cfg
ws_core
0x35
0x30
0x31
0x32
0x34
0x33
Configuration. Write protection options for other instructions.
Core. Fields also accessible via dedicated core-side ports.
Tuning. Fields for fine tuning macro performance.
ws_tuning
ws_debug
ws_unshadowed
ws_char
Debug. Fields for advanced control, manufacturing test, silicon characterization and debug.
Unshadowed. Fields for silicon characterization.
Char. Fields used for eye scan.
The data for each SerDes instruction is formed by chaining together sub-components called head, body (receiver
or transmitter) and tail. DAC38RF82 (or DAC38RF89) uses two SerDes receiver blocks R0 and R1, each of
which contains 4 receive lanes (channels), the data for each IEEE1500 instruction is formed by chaining {head,
receive lane 0, receive lane 1, receive lane 2, receive lane 3, tail}. A description of bits in head, body and tail for
each instruction is given as follows:
NOTE
All multi-bit signals in each chain are packed with bits reversed e.g. mpy[7:0] in ws_core
head subchain is packed as {retime, enpll, mpy[0:7], vrange, lb[0:1]}. All DATA REGISTER
READS from SerDes Block R0 should read 1 bit more than the desired number of bits and
discard the first bit received on TDO e.g., to read 40-bit data from R0 block, 41 bits should
be read off from TDO and the first bit received should be discarded. Similarly, any data
written to SerDes Block R0 Data Registers should be prefixed with an extra 0.
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Table 30. ws_cfg Chain
FIELD
DESCRIPTION
HEAD (STARTING FROM THE MSB OF CHAIN)
RETIME
No function.
CORE_WE
Core chain write enable.
RECEIVER (FOR EACH LANE 0, 1, 2, 3)
CORE_WE
TUNING_WE
Core chain write enable.
Tuning chain write enable.
Reserved.
DEBUG_WE
CHAR_WE
Char chain write enable.
Reserved.
UNSHADOWED_WE
TAIL (ENDING WITH THE LSB OF CHAIN)
CORE_WE
TUNING_WE
DEBUG_WE
RETIME
Core chain write enable.
Tuning chain write enable.
Reserved.
No function.
CHAIN LENGTH = 26 BITS
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Table 31. ws_core Chain
FIELD
DESCRIPTION
HEAD (STARTING FROM THE MSB OF CHAIN)
RETIME
No function.
PLL enable.
ENPLL
MPY[7:0]
VRANGE
ENDIVCLK
LB[1:0]
PLL multiply.
VCO range.
Enable DIVCLK output
Loop bandwidth
RECEIVER (FOR EACH LANE 0,1,2,3)
ENRX
SLEEPRX
BUSWIDTH[2:0]
RATE[1:0]
INVPAIR
Receiver enable.
Receiver sleep mode.
Bus width.
Operating rate.
Invert polarity.
TERM[2:0]
ALIGN[1:0]
LOS[2:0]
Termination.
Symbol alignment.
Loss of signal enable.
Clock/data recovery.
Equalizer.
CDR[2:0]
EQ[2:0]
EQHLD
Equalizer hold.
ENOC
Offset compensation.
Loopback.
LOOPBACK[1:0]
BSINRXP
BSINRXN
RESERVED
Testpatt[2:0]
TESTFAIL
LOSTDTCT
BSRXP
Boundary scan initialization.
Boundary scan initialization.
Reserved.
Test pattern selection.
Test failure (real time).
Loss of signal detected (real time).
Boundary scan data.
Boundary scan data.
Offset compensation in progress.
Receiver signal over equalized.
Receiver signal under equalized.
Loss of signal detected (sticky).
BSRXN
OCIP
EQOVER
EQUNDER
LOSTDTCT
Re-alignment done, or aligned comma output
(sticky).
SYNC
RETIME
No function.
TAIL (ENDING WITH THE LSB CHAIN)
CLKBYP[1:0]
SLEEPPLL
RESERVED
LOCK
Clock bypass.
PLL sleep mode.
Reserved.
PLL lock (real time).
Boundary scan initialization clock.
Enable TX boundary scan.
Enable RX boundary scan.
RX pulse boundary scan.
Reserved.
BSINITCLK
ENBSTX
ENBSRX
ENBSPT
RESERVED
NEARLOCK
UNLOCK
PLL near to lock.
PLL lock (sticky).
44
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Table 31. ws_core Chain (continued)
FIELD
CFG OVR
RETIME
DESCRIPTION
Configuration over-ride.
No function.
CHAIN LENGTH = 196 BITS
Table 32. ws_tuning Chain
FIELD
DESCRIPTION
HEAD (STARTING FROM THE MSB OF CHAIN)
RETIME No function.
RECEIVER (FOR EACH LANE 0,1,2,3)
PATTERRTHR[2:0]
Resync error threshold.
PRBS timer.
PATT TIMER
RXDSEL[3:0]
ENCOR
Status select.
Enable clear-on-read for error counter.
EQZ OVRi Equalizer zero.
Equalizer zero over-ride.
EQ OVRi Equalizer gain observe or set.
Equalizer over-ride.
EQZERO[4:0]
EQZ OVR
EQLEVEL[15:0]
EQ OVR
EQBOOST[1:0]
RXASEL[2:0]
Equalizer gain boost.
Selects amux output.
TAIL (ENDING WITH THE LSB CHAIN)
ASEL[3:0]
USR PATT[19:0]
RETIME
Selects amux output.
User-defined test pattern.
No function.
CHAIN LENGTH = 174 BITS
Table 33. ws_char Chain
FIELD
DESCRIPTION
HEAD (STARTING FROM THE MSB OF CHAIN)
RETIME No function.
RECEIVER (FOR EACH LANE 0,1,2,3)
Test failure (sticky).
TESTFAIL
ECOUNT[11:0]
ESWORD[7:0]
ES[3:0]
Error counter.
Eye scan word masking.
Eye scan.
ESPO[6:0]
Eye scan phase offset.
Eye scan compare bit select.
Eye scan voltage offset.
Eye scan voltage offset override.
Eye scan run length.
Eye scan run.
ES BIT SELECT[4:0]
ESVO[5:0]
ESVO OVR
ESLEN[1:0]
ESRUN
ESDONE
Eye scan done.
TAIL (ENDING WITH THE LSB CHAIN)
RETIME
No function.
CHAIN LENGTH = 194 BITS
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8.3.14 Error Counter
All receive channels include a 12-bit counter for accumulating pattern verification errors. This counter is
accessible via the ECOUNT IEEE1500 Char field. It is an essential part of the eye scan capability (see the Eye
Scan section).
The counter increments once for every cycle that the TESTFAIL bit is detected. The counter does not increment
when at its maximum value (i.e., all 1s). When an IEEE1500 capture is performed, the count value is loaded into
the ECOUNT scan elements (so that it can be scanned out), and the counter is then reset, provided NCOR is set
high.
ECOUNT can be used to get a measure of the bit error rate. However, as the error rate increases, it becomes
less accurate due to limitations of the pattern verification capabilities. Specifically, the pattern verifier checks
multiple bits in parallel (as determined by the Rx bus width), and it is not possible to distinguish between 1 or
more errors.
8.3.15 Eye Scan
All receive channels provide features which facilitate mapping the received data eye or extracting a symbol
response. A number of fields accessible via the IEEE1500 Char scan chain allow the required low level data to
be gathered. The process of transforming this data into a map of the eye or a symbol response must then be
performed externally, typically in software.
The basic principle used is as follows:
•
Enable dedicated eye scan input samplers, and generate an error when the value sampled differs from the
normal data sample;
•
•
•
Apply a voltage offset to the dedicated eye scan input samplers, to effectively reduce their sensitivity;
Apply a phase offset to adjust the point in the eye that the dedicated eye scan data samples are taken;
Reset the error counter to remove any false errors accumulated as a result of the voltage or phase offset
adjustments;
•
•
Run in this state for a period of time, periodically checking to see if any errors have occurred;
Change voltage and/or phase offset, and repeat.
Alternatively, the algorithm can be configured to optimize the voltage offset at a specified phase offset, over a
specified time interval.
Eye scan can be used in both synchronous and asynchronous systems, while receiving normal data traffic. The
IEEE1500 Char fields used to directly control eye scan and symbol response extraction are ES, ESWORD, ES
BIT SELECT, ESLEN, ESPO, ESVO, ESVO OVR, ESRUN and ESDONE. Eye scan errors are accumulated in
ECOUNT.
The required eyescan mode is selected via the ES field, as shown in Table 34. When enabled, only data from
the bit position within the 20-bit word specified via ES BIT SELECT is analyzed. In other words, only eye scan
errors associated with data output at this bit position will accumulate in ECOUNT. The maximum legal ES BIT
SELECT is 10011.
Table 34. Eye Scan Mode Selection
ES[3:0]
EFFECT
0000
Disabled. Eye scan is disabled.
Compare. Counts mismatches between the normal sample and the eye scan sample if ES[2] = 0, and matches
otherwise.
0x01
0x10
0x11
0100
Compare zeros. As ES = 0x01, but only analyses zeros, and ignores ones.
Compare ones. As ES = 0x01, but only analyses ones, and ignores zeroes.
Count ones. Increments ECOUNT when the eye scan sample is a 1.
Average. Adjusts ESVO to the average eye opening over the time interval specified by ESLEN. Analyses zeroes when
ES[2] = 0, and ones when ES[2]= 1.
1x00
1001
1110
Outer. Adjusts ESVO to the outer eye opening (i.e. lowest voltage zero, highest voltage 1) over the time interval
specified by ESLEN. 1001 analyses zeroes, 1110 analyses ones.
1010
1101
Inner. Adjusts ESVO to the inner eye opening (i.e. highest voltage zero, lowest voltage 1) over the time interval
specified by ESLEN. 1010 analyses zeroes, 1101 analyses ones.
46
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Table 34. Eye Scan Mode Selection (continued)
ES[3:0]
EFFECT
Timed Compare. As ES = 001x, but analyses over the time interval specified by ESLEN. Analyses zeroes when ES[2] =
0, and ones when ES[2] = 1.
1x11
When ES[3] = 0, the selected analysis runs continuously. However, when ES[3] = 1, only the number of qualified
samples specified by ESLed, as shown in Table 35. In this case, analysis is started by writing a 1 to ESRUN (it is
not necessary to set it back to 0). When analysis completes, ESDONE is set to 1.
Table 35. Eye Scan Run Length
ESLen
00
NUMBER OF SAMPLES ANALYZED
127
1023
8095
65535
01
10
11
When ESVO OVR = 1, the ESVO field determines the amount of offset voltage that is applied to the eye scan
data samplers associated with rxpi and rxni. The amount of offset is variable between 0 and 300 mV in
increments of ~10 mV, as shown Table 36. When ES[3] = 1, ESVO OVR must be 0 to allow the optimized
voltage offset to be read back via ESVO.
Table 36. Eye Scan Voltage Offset
ESVO
100000
…
OFFSET (mV)
-310
…
111110
111111
000000
000001
000010
…
-20
-10
0
10
20
…
011111
300
The phase position of the samplers associated with rxpi and rxni, is controlled to a precision of 1/32UI. When ES
is not 00, the phase position can be adjusted forwards or backwards by more than one UI using the ESPO field,
as shown in Table 37. In normal use, the range should be limited to ±0.5 UI (+15 to –16 phase steps).
Table 37. Eye Scan Phase Offset
ESPO
011111
…
OFFSET (1/32 UI)
+63
…
000001
000000
111111
…
+1
0
-1
…
100000
-64
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8.3.16 JESD204B Pattern Test
The DAC38RF82 (or DAC38RF89) supports the following test patterns for JESD204B:
•
Link layer test pattern by setting field JESD_TEST_SEQ in register JESD_LN_EN (8.5.45) and monitoring the
lane alarms (1 = fail, 0 = pass)
–
–
–
Verify repeating /D.21.5/ high frequency pattern for random jitter (RJ)
Verify repeating /K.28.5/ mixed frequency pattern for deterministic jitter (DJ)
Verify repeating initial lane alignment (ILA) sequence
•
•
RPAT, JSPAT or JTSPAT pattern can be verified using errors counter of 8b/10b errors produced over an
amount of time to get an estimate of BER.
Transport layer test pattern: implements a short transport layer pattern check based on F = 1, 2, 4 or 8. The
short test pattern has a duration of one frame period and is repeated continuously for the duration of the test.
Each sample has a unique value that can be identified with the position of the sample in the user data format.
The sample values are such that correct sample values will never be decoded at the receiver if there is a
mismatch between the mapping formats being used at the transmitter and receiver devices. This can
generally be accomplished by ensuring there are no repeating sub patterns within the stream of samples
being transmitted. Refer to the JESD204B standard section 5.1.6 for more details.
The DAC38RF82 (or DAC38RF89) expects the test samples, in a frame, transmitted by an logic device as per
Table 38:
Table 38. Short Test Patterns
JESD Mode
82121
i0
7CB8, F431
7CB8
q0
6DA9, E520
F431
i1
n/a
q1
n/a
42111
n/a
n/a
22210
7CB8
F431
n/a
n/a
12410
7CB8
F431
n/a
n/a
44210
7CB8
F431
6DA9
6DA9
n/a
E520
E520
n/a
24410
7CB8
F431
41121
7CB8, F431
n/a
7C00, B800, F400, 3100, 6D00,
A900, E500, 2000
81180
24310
41380
n/a
F430
n/a
n/a
6DA0
n/a
n/a
E520
n/a
7CB0
7CB0, F430, 6DA0, E520, F870,
E960, DA50, CB40
The short test pattern has duration of one frame period and is repeated continuously for the duration of the test.
Each sample has a unique value that can be identified with the position of the sample in the user data format.
The sample values are such that correct sample values will never be decoded at the receiver if there is a
mismatch between the mapping formats being used at the transmitter and receiver devices. This can generally
be accomplished by ensuring there are no repeating sub patterns within the stream of samples being transmitted.
Following are the steps required to execute the short test functionality in DAC38RF82 (or DAC38RF89).
1. Configure other registers, make sure clocks are up and running.
2. Start driving short test patterns
3. Clear short test alarm by writing ‘0’ to field ALM_FROM_SHORTTEST in register ALM_SYSREF_PAP
(8.5.67). This is a paged register, one for each Multi-DUC.
4. Enable short test by writing a ‘1’ to field SHORTTEST_ENA in register MULTIDUC_CFG2 (8.5.14).
5. Read the short test alarm from field ALM_FROM_SHORTTEST in register ALM_SYSREF_PAP (8.5.67).
This is a paged register, one for each Multi-DUC
If the alarm read from the register is high, the short test has detected an error.
48
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8.3.17 Wideband DUC (wide-DUC)
Each DAC output in the DAC38RF82 ((or DAC38RF89)) can be supported by a wide band digital up-converter
(DUC), which is called a wide-DUC. Figure 33 shows the implementation and signal processing features of the
wide-DUC which is only available in the 2-TX modes (Table 9). For complex inputs, the in-phase (or I-channel) is
path AB of DAC A and the phase of the NCO in this path (7.5.19) must be set to 0 degrees. Similarly, the
quadrature phase (or Q-channel) is path AB of DAC B and the phase of the NCO in this path (7.5.19) must be
set to 90 degrees. The NCO frequency in both I and Q paths (7.5.20) must be set to the same value. The SPI
interface registers for the wide-DUC are addressed through paging, with page 1 supporting the I-channel and
page 2 supporting Q-channel configuration of the wide-DUC. Register PAGE_SET (8.5.8) is used to set the
pages. Both pages can be selected at the same time to program both channels of wide-DUC simultaneously.
The output of I and Q channels are added together using the output summation block (Figure 33). Bit 0 and Bit 2
of the register field OUTSUM_SEL must be set to for this to be accomplished.
48-bit
NCO1
cos
Input
Mux
Multiband
summation
I
Path AB
(DAC A)
x
sin(x)
PAP
Gain
xN
12/16
CMIX control
( n x Fs/4)
Delay
CMIX control
( n x Fs/4)
Q
x
sin(x)
PAP
Gain
Path AB
(DAC B)
xN
12/16
sin
48-bit
NCO2
Copyright © 2016, Texas Instruments Incorporated
Figure 33. DAC38RF82 Wide-DUC Signal Processing Block Diagram
8.3.18 Interpolation Block
The DAC38RF82 (or DAC38RF89) provides the optional interpolation of 2x in 12-bit input mode and 2x or 4x in
16-bit input mode. In addition, 1x interpolation can be used in 8, 12 or 16-bit input modes to pass the data
directly to the DAC output. The SPI interface registers for the multi-DUCs are addressed through paging, with
page 0 supporting the I channel and page 1 supporting the Q channel. Register PAGE_SET (8.4.8) is used to set
the pages. Both pages can be selected at the same time to program both multi-DUCs simultaneously with the
same settings.
8.3.18.1 Multi-DUC input
Each interpolation block accepts data from up to 8 SerDes lanes. A crossbar switch allows any SerDes lane to
be mapped to any other SerDes lane. The crossbar switch is controlled by fields OCTETPATHx_SEL (x = [0..7])
in Registers JESD_CROSSBAR1 (8.5.57) and JESD_CROSSBAR2 (8.5.58).
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8.3.18.2 Interpolation Filters
The digital upconverter first increases the sample rate of the IQ signal from the input sample rate to the final
DAC sample rate through a series of interpolation filters. Different sets of filters are used to achieve different
rates, as shown in Table 39. The interpolation rate is selected by field INTERP in register MULTIDUC_CFG1
(8.5.13).
Table 39. FIR filters Used for Different Interpolation Rates
FILTERS USED
Interpolation Rate
FIR0 (2x)
FIR1 (2x)
2
4
x
x
x
The FIR filter coefficients are shown in Table 40 The FIR filters are design with a passband BW of 0.4 x fINPUT, a
stopband attenuation of 90 dBc and ripple of < 0.001 dB. The composite frequency response for each
interpolation factor are shown in Figure 34to Figure 41.
20
0
20
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
D001
D002_8x
Figure 34. Composite Magnitude Response for 6x
Interpolation
Figure 35. Composite Magnitude Response for 8x
Interpolation
20
0
20
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
D003
D004
Figure 36. Composite Magnitude Response for 10x
Interpolation
Figure 37. Composite Magnitude Response for 12x
Interpolation
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20
0
20
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-120
-140
-100
-120
-140
-160
-160
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
D005
D006
Figure 38. Composite Magnitude Response for 16x
Interpolation
Figure 39. Composite Magnitude Response for 18x
Interpolation
20
0
20
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
0
0.075
0.15
0.225
f/Fdac
0.3
0.375
0.45
D007
D001
Figure 40. Composite Magnitude Response for 20x
Interpolation
Figure 41. Composite Magnitude Response for 24x
Interpolation
Table 40. FIR Filter Coefficients
tap
1
FIR0
6
FIR1
-12
0
LPFIR0_5X
-6
FIR2
29
LPFIR0_3X
-14
FIR3
3
LPFIR1_3X INVSINC
25
1
-4
2
0
-22
0
-61
0
88
3
-19
0
84
-51
-214
0
-125
-25
0
22
13
-50
592
-50
13
-4
4
0
-89
-95
-576
5
47
0
-336
0
-117
-106
-18
1209
2048
1209
0
181
150
256
150
0
-1764
-2263
491
6
681
7
-100
0
1006
0
972
8
171
347
8139
18625
26365
26365
18625
8139
491
9
192
0
-2691
0
449
-214
0
-1475
-3519
-3528
707
-25
0
1
10
11
12
13
14
15
16
745
-342
0
10141
16384
10141
0
930
29
3
841
572
0
338
9337
19445
26299
26299
-618
-1892
-3147
-914
0
-2691
0
-2263
-1764
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Table 40. FIR Filter Coefficients (continued)
tap
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
FIR0
1409
0
FIR1
1006
0
LPFIR0_5X
-3872
-3500
-1564
2121
7336
13430
19426
24231
26904
26904
24231
19426
13430
7336
2121
-1564
-3500
-3872
-3147
-1892
-618
FIR2
LPFIR0_3X
19445
9337
707
FIR3
LPFIR1_3X INVSINC
-576
22
-2119
0
-336
0
88
-3528
-3519
-1475
347
25
3152
0
84
0
-4729
0
-12
972
7420
0
681
181
-13334
0
-95
-125
-61
41527
65536
41527
0
-14
-13334
0
7420
0
-4729
0
338
3152
0
841
930
-2119
0
745
449
1409
0
171
-18
-914
0
-106
-117
572
0
-89
-51
-342
0
-22
-6
192
0
-100
0
47
0
-19
0
6
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8.3.18.3 JESD204B Modes, Interpolation and Clock phase Programming
Table 41 lists the register field values required for each JESD204B mode interpolation mode and clock phase.
The register field addresses are listed in Table 42.
Table 41. Register Programming for JESD and Interpolation Mode
Mode
L-M-F-S-Hd
Register Field Programming
CLKJESD
_OUT_DI
V
CLOCK
PHASES
(1-0)
CLKJESD
_DIV
(3-0)
N_M1/N’_
M1
(4-0)
INTERP
(4-0)
L_M1
(4-0)
F_M1
(7-0)
M_M1
(7-0)
S_M1
(4-0)
Interp
HD
1 TX/2TX
(3-0)
6
8
11
11
11
11
10
11
11
11
11
11
11
01
10
11
11
11
11
01
10
01
10
11
11
01
10
11
00
00
01
01
11
11
00011
00100
00110
01000
00011
00100
00101
00110
01000
01001
01100
00100
00110
01000
01001
01010
01100
01000
01100
00100
00110
01000
01100
01000
01100
00000
00000
00001
00000
000001
00010
01100
0110
0111
1010
1011
0010
0011
0101
0110
0111
1001
1010
0001
0010
0011
0100
0101
0110
0001
0010
0001
0010
0011
0110
0001
0010
0011
1100
1101
0000
0001
0011
0011
0011
0100
0110
0111
0011
0100
0101
0110
0111
1000
1010
0100
0110
0111
1000
1001
1010
0111
1010
0100
0110
0111
1010
0111
1010
0001
0000
0001
0000
0001
0010
1010
82121/NA
00111
00011
0x00
0x00
0x01
0x01
00001
00000
1
01111
01111
12
16
6
8
10
12
16
18
24
8
42111/84111
1
12
16
18
20
24
16
24
8
22210/44210
00001
0x01
0x01
00000
0
01111
12410/24410
44210/88210
00000
00011
0x03
0x01
0x01
0x03
00000
00000
0
0
01111
01111
12
16
24
16
24
1
24410/48410
81180/NA
00001
00111
00011
0x03
0x00
0x02
0x03
0x00
0x00
00000
00111
00111
0
0
0
01111
00111
01011
1
41380/82380
2
1
41121/ 82121
24310/48310
2
00011
00001
0x00
0x02
0x00
0x03
00001
00000
1
0
01111
01011
4
24
Table 42. Register Field Addresses for JESD204B Mode, Interpolation and Clock Phase Programming
Register Field Name
INTERP
Register
Register Address
Bit(s)
12-8
15-12
11-8
4-0
Hyperlink
MULTIDUC_CFG1
0x0A
8.5.13
CLKJESD_DIV
CLKJESD_OUT_DIV
L_M1
SerDes_CLK
0x25
8.5.28
JESD_K_L
0x4C
0x4B
8.5.47
8.5.46
F_M1
JESD_RBD_F
7-0
M_M1
15-8
4-0
JESD_M_S
0x4D
8.5.48
S_M1
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Table 42. Register Field Addresses for JESD204B Mode, Interpolation and Clock Phase
Programming (continued)
Register Field Name
HD
Register
Register Address
Bit(s)
6
Hyperlink
N_M1
JESD_N_HD_SCR
JESD_LN_EN
0x4E
0x4A
4-0
8.5.49
N_M1’ (NPRIME_M1)
JESD_PHASE_MODE
12-8
1-0
8.5.45
All registers are paged!
8.3.18.4 Digital Quadrature Modulator
Each DUC in the DAC38RF8x has digital quadrature modulator (DQM) blocks with independent Numerically
Controlled Oscillators (NCO) that converts the complex input signal to a real signal with flexible frequency
placement between 0 and fDAC/2. The NCOs are enabled by fields NCOAB_ENA and NCOCD_ENA in register
MULTIDUC_CFG2 (8.5.14). The NCOs have 48-bit frequency registers (FREQ_NCOAB (8.5.25) and
FREQ_NCOCD (8.5.26)) and 16-bit phase registers (PHASE_NCOAB (8.5.23) and PHASE_NCOCD (8.5.24))
that generate the sine and cosine terms for the complex mixing. The NCO block diagram is shown in Figure 42.
48
16
sin
Accumulator
CLK RESET
48
48
48
16
16
Look Up
Table
Frequency
Register
16
cos
16
FDAC
NCO SYNC
via
syncsel_NCO(3:0)
Phase
Register
Figure 42. NCO Block Diagram
Synchronization of the NCOs occurs by resetting the NCO accumulators to zero. The synchronization source is
selected by fields SYNCSEL_NCOAB and SYNCSEL_NCOCD in register SYNCSEL1 (8.5.29). The frequency
word in the FREQ_NCOAB and FREQ_NCOCD registers are added to the accumulators every clock cycle, fDAC
.
The frequency and phase offset of the NCOs are:
FREQ _NCOAB or CD ì f
(
)
DAC
f
=
NCOAB or CD
(
)
48
2
(1)
(2)
PHASE _NCOAB or CD
(
)
/
= 2Œ ì
AB or CD
(
)
16
2
Treating the complex channels as complex vectors of the form I + j Q, the output of the DQM is:
MIXERAB _GAIN-1
(
ì 2
AB
)
Output
= I
ìcos 2Œf
t + /
-Q
ìsin 2Œf
t + /
(
)
(
)
AB
INPUTAB
NCOAB
AB
INPUTAB
-Q ìsin 2Œf
INPUTCD
NCOAB
(3)
(4)
MIXERCD_GAIN-1
(
t + / ì2
NCOCD CD
)
Output
= I
ìcos 2Œf
t + /
CD
(
)
(
)
CD
INPUTCD
NCOCD
Where t is the time since the last resetting of the NCO accumulator and the fields MIXERAB_GAIN and
MIXERCD_GAIN in register MULTIDUC_CFG2 (8.5.13) are either 0 or 1.
The maximum output amplitude of the DQM occurs if IIN(t) and QIN(t) are simultaneously full scale amplitude and
the sine and cosine arguments are equal to an integer multiple of π/4.
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With MIXERAB_GAIN or MIXERCD_GAIN = 0, the gain through the DQM is sqrt(2)/2 or -3 dB. This loss in signal
power is in most cases undesirable, and it is recommended that the gain function be used to increase the signal
by 3 dB to compensate. With MIXERAB_GAIN or MIXERCD_GAIN = 1, the gain through the DQM is sqrt(2) or
+3 dB, which can cause clipping of the signal if IIN(t) and QIN(t) are simultaneously near full scale amplitude and
should therefore be used with caution.
8.3.18.5 Low Power Coarse Resolution Mixing Modes
In addition to the NCO the DAC38RFxx also has a coarse mixer block capable of shifting the input signal
spectrum by the fixed mixing frequencies ±N x fDAC/8. Using the coarse mixer instead of the full mixers will result
in lower power consumption.
Treating the two complex channels as complex vectors of the form I(t) + j Q(t), the outputs of the coarse mixer is
equivalent to:
Output
= I
ìcos 2Œf
t -Q
ì sin 2Œf
t
AB
INPUTAB
CMIX _ AB
INPUTAB
CMIX _ AB
(5)
(6)
Output = I
CD INPUTCD
ìcos 2Œf
t -Q
ì sin 2Œf
t
CMIX _CD
INPUTCD
CMIX _CD
Where fCMIX_AB and fCMIX_CD and the fixed mixing frequency selected by fields CMIX_AB or CMIX_CD in register
CMIX (8.5.21). The coarse mixer blocks are disabled by setting CMIX_AB and CMIX_CD to 0x0.
The NCO and coarse mixers can be enabled simultaneously, although this is not useful in most cases as the full
frequency range can be covered by the NCO.
8.3.18.6 Inverse Sinc Filter
The DAC38RF82 (or DAC38RF89) has a 9-tap inverse Sinc filter (INVSINC) that runs at the DAC update rate
(fDAC) that can be used to flatten the frequency response of the sample-and-hold output. The DAC sample-and-
hold output sets the output current and holds it constant for one DAC clock cycle until the next sample, resulting
in the well known sin(x)/x or Sinc(x) frequency response (Figure 43, red line). The inverse sinc filter response
(Figure 43, blue line) has the opposite frequency response from 0 to 0.4 x fDAC, resulting in the combined
response (Figure 43, green line). Between 0 to 0.4 x fDAC, the inverse sinc filter compensates the sample-and-
hold roll-off with less than 0.03 dB error.
The inverse sinc filter has a gain > 1 at all frequencies. Therefore, the signal input to INVSINC must be reduced
from full scale to prevent saturation in the filter. The amount of back-off required depends on the signal
frequency, and is set such that at the signal frequencies the combination of the input signal and filter response is
less than 1 (0 dB). For example, if the signal input to INVSINC is at 0.25 x fDAC, the response of INVSINC is 0.9
dB, and the signal must be backed off from full scale by 0.9 dB to avoid saturation. The advantage of INVSINC
having a positive gain at all frequencies is that the user is then able to optimize the back-off of the signal based
on its frequency.
The inverse sinc filters are enabled by field ISFIR_ENA in register MULTIDUC_CFG1 (8.5.13).
4
3
FIR4
2
1
0
Corrected
–1
–2
–3
–4
sin(x)/x
0
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
f/fDAC
G056
Figure 43. Composite Magnitude Spectrum for INVSINC
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8.3.19 PA Protection Block
The DAC38RFxx incorporates an optional power amplifier protection (PAP) block to monitor when the input
signal is two large, for example when an interface error occurs, and reduces the output signal power of the DAC.
The PAP block achieves the functionality of reducing the input signal that crosses the threshold through three
main sub-blocks. These are PAP trigger generation block, PAP gain state machine and GAIN block.
The PAP block keeps track of the input signal power by maintaining a sliding window accumulation of last N
samples. N is selectable to be 32, 64 or 128 based on the setting (Table 43) of fields PAPAB_SEL_DLY in
register PAP_CFG_AB (8.5.35) and PAPCD_SEL_DLY in register PAP_CFG_CD (8.5.36). The average
amplitude of input signal is computed by dividing accumulated value by the number of samples in the delay-line
(N). The result is then compared against the threshold in fields PAPAB_THRESH in register PAP_CFG_AB
(8.5.35) and PAPCD_THRESH in register PAP_CFG_CD (8.5.36). If the threshold is violated, gain state machine
is triggered which generated gain value to ramp down the DAC output signal amplitude. After the input signal
returns to normal value, the state machine ramps up the DAC output signal amplitude.
Table 43. PAP Delay Line Selection
pap_sel_dly[1:0]
# of samples averaged
00
01
10
11
32
64
128
Reserved
The generation of the PAP trigger as explained as follows:
•
•
•
•
•
•
•
The I and Q samples are treated separately – either can trigger attenuation
In dual DUC modes, each IQ pair is treated separately and has a separate gain block
8 samples at the input are put through an absolute value circuit (all 2’s complement)
Next these values are vector summed to get a 12 bit result
Then 12 bit result is placed into the delay line and summed into the accumulator
The accumulator is also subtracting out the delayed 12 bit word corresponding to N = 32, N = 64 or N = 128
Finally the accumulator output is divided down by N and rounded to 13 bits. These 13 bits are compared to
the threshold in the SPI registers. A pap_trig occurs if the threshold is exceeded.
The PAP gain state machine generates the pap gain value to be applied on the output stream to reduce the
output signal amplitude. The state machine below is used to control the attenuation of the DAC output and the
gaining up of the signal again once the trigger is released.
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pap_trig=0
pap_gain=1
Normal
pap_trig=1
pap_trig=1
Attenuate
Gain
wait_cnt_load_r=0
pap_trig=0
wait_cnt_load_r=1
Wait
pap_trig=1
Copyright © 2017, Texas Instruments Incorporated
Figure 44. PAP Gain State Machine
The normal operating condition for the PAP block is the NORMAL state in Figure 44. However, when the PAP
block detects an error condition it sets the pap_trig signal to ‘1’ causing a state transition from NORMAL
operation to the ATTENUATE state.
In the ATTENUTATE state the data path gain is scaled from 1.0 down to 0.0 by a programmable step amount set
by fields PAPAB_GAIN_STEP in register PAP_GAIN_AB (8.5.31) and PAPCD_GAIN_STEP in register
PAP_GAIN_CD (8.5.33). This value is always positive with the decimal place located between the MSB and
MSB-1. Unity is equal to “1000000000”. Each clock cycle (16 samples) the PAP_GAIN is stepped down by
PAPAB_GAIN_STEP and PAPCD_GAIN_STEP until the gain is 0.
After PAP_GAIN is 0, the state machine moves on to the WAIT state. Here a programmable counter counts clock
cycles to allow the condition for the pap_trig to be fixed. Fields PAPAB_WAIT in register PAP_WAIT_AB (8.5.32)
and PAPCD_WAIT in register PAP_WAIT_CD (8.5.34) are used to select the number of clock cycles (samples =
16 x PAPAB_WAIT or 16 x PAPCD_WAIT) to wait before moving to the next state. Once the WAIT counter
equals zero and pap_trig=’0’, the state machine moves on to the GAIN state. If the WAIT equals 0 but pap_trig
still equals ‘1’ then the state machine stays in the WAIT state until pap_trig =’0’.
8.3.20 Gain Block
The GAIN block also has additional output gain control through fields GAINAB in register GAINAB (8.5.39) and
GAINCD in register GAINCD (8.5.40). Similar to PAP_GAIN value, the output gain is always positive with unity
when GAINAB or GAINCD = ”010000000000”.
To reduce the power, the gain block clock has been gated whenever the pap is disabled and GAINAB or
GAINCD is set to unity.
8.3.21 Output Summation
The OUTSUM block allows addition of samples from each DUC in the multi-DUC. It is also possible to add the
output samples from the adjacent multi-DUC. Field OUTSUM_SEL in register OUTSUM (8.5.22) controls the
summation for each multi-DUC. The functionality of the block can be represented by the following equation:
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OUTSUM
output
= SAME
+ SAME
CD
+ ADJ
+ ADJ
AB CD
AB
(7)
In order to avoid overflow, rounding operation is performed after the addition to reduce the word size back to 16-
bits. Exact number of bits rounded depends on the number of channels added. Table 44 shows the description of
round after the summation.
Table 44. OUTSUM Scaling and Rounding
# OF CHANNELS ADDED
# OF BITS ROUNDED
0
1
2
3
4
0, Use bits[15:0] from the result
Use bits[16:1] from the result and bit[0] used for rounding
Use bits[17:2] from the result and bits[1:0] used for rounding
Use bits[18:3] from the result and bit[2:0 used for rounding
Use bits[19:4] from the result and bit[3:0] used for rounding
8.3.22 Output Delay
The signal following output summation can be programmably delayed by 0-15 DACCLK cycles through field
OUTPUT_DELAY in register OUTSUM (8.5.20). The block takes 16 sample words (vec16) from both the A and B
paths and shifts the them to 32 sample long delay line.
8.3.23 Polarity Inversion
The signal following the output delay can be inverted by a 2’s complement conversion allowing the + and - DAC
outputs to be swapped by asserting field DAC_COMPLEMENT in register MULTIDUC_CFG1 (8.5.13).
8.3.24 Temperature Sensor
The DAC38RF82 (or DAC38RF89) incorporates a temperature sensor block which monitors the die temperature
by measuring the voltage across 2 transistors. The voltage is converted to an 8-bit digital word using a
successive approximation (SAR) analog to digital conversion process. The result is scaled, limited and formatted
as a twos complement value representing the temperature in degrees Celsius.
The sampling is controlled by the serial interface signals SDEN and SCLK. If the temperature sensor is enabled
by writing a 0 to field TSENSE_SLEEP in register SLEEP_CONFIG (8.5.70), a conversion takes place each time
the serial port is written or read. The data is only read and sent out by the digital block when the temperature
sensor is read in field TEMPDATA in register TEMP_PLLVOLT (8.5.7). The conversion uses the first eight clocks
of the serial clock as the capture and conversion clock, the data is valid on the falling eighth SCLK. The data is
then clocked out of the chip on the rising edge of the ninth SCLK. No other clocks to the chip are necessary for
the temperature sensor operation. As a result the temperature sensor is enabled even when the device is in
sleep mode.
In order for the process described above to operate properly, the serial port read from register TEMP_PLLVOLT
must be done with an SCLK period of at least 1 μs. If this is not satisfied the temperature sensor accuracy is
greatly reduced.
8.3.25 Alarm Monitoring
The DAC38RF82 (or DAC38RF89) includes a flexible set of alarm monitoring that can be used to alert of a
possible malfunction scenario. All the alarm events can be accessed either through the SIP registers and/or
through the ALARM output. Once an alarm is set, the corresponding alarm bit must be reset through the serial
interface to allow further testing. The set of alarms includes the following conditions:
•
JESD alarms
Fields ALM_LANEx_ERR in registers JESD_ALM_Lx (x = 0-7, 8.5.59 to 8.5.66):
–
–
–
–
–
–
–
multiframe alignment_error. Occurs when multiframe alignment fails
frame alignment error. Occurs when multiframe alignment fails
link configuration error. Occurs when there is wrong link configuration
elastic buffer overflow. Occurs when bad RBD value is used
elastic buffer match error. Occurs when the first non-/K/ doesn’t match the programmed data
code synchronization error
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–
–
8b/10b not-in-table decode error
8b/10b disparity error
–
Field ALM_FROM_SHORTTEST in register ALM_SYSREF_PAP (8.5.67): Occurs when the short pattern
test fails.
•
SerDes alarms
–
Field ALM_SD_LOTDET in register ALM_SD_DET 8.5.5): Occurs when there are loss of signal detect
from SerDes lanes.
–
Fields ALM_FIFOx_FLAGS in registers JESD_ALM_Lx (x = 0-7, 8.5.59 to 8.5.66):
–
–
–
–
FIFO write error. Occurs if write request and FIFO is full.
FIFO write full: Occurs if FIFO is full.
FIFO read error. Occurs if read request and FIFO is empty.
FIFO read empty: Occurs if FIFO is empty.
–
–
Field ALM_SD0_PLL in register ALM_SYSREF_DET (8.5.6): Occurs if the PLL in the SerDes block 0
goes out of lock.
Field ALM_SD1_PLL in register ALM_SYSREF_DET (8.5.6): Occurs if the PLL in the SerDes block 1
goes out of lock.
•
•
•
SYSREF alarm
–
Field ALM_SYSREF_ERR in register ALM_SYSREF_PAP (8.5.67): Occurs when the SYSREF is received
at an unexpected time. If too many of these occur it will cause the JESD to go into synchronization mode
again.
DAC PLL alarm
–
Field PLL_LOCK in register ALM_SYSREF_DET (8.5.6). This register field is asserted when the PLL is
unlocked. When used as an alarm output, a high signal indicates that the PLL is unlocked if the
ALM_OUT_POL bit in register RESET_CONFIG is set to 1.
PAP alarm
Field ALM_PAP in register ALM_SYSREF_PAP (8.5.67): Occurs when the average power is above the
threshold. While any alarm_pap is asserted the attenuation for the appropriate data path is applied.
–
8.3.26 Differential Clock Inputs
Figure 45 shows the preferred configuration for driving the DACCLK+/- and SYSREF+/- with a differential
ECL/PECL source.
LVPCL Driver
0.01 mF
C
100 W
AC
0.01 mF
240 W
240 W
Copyright © 2016, Texas Instruments Incorporated
Figure 45. Preferred Clock Input Configuration With a Differential ECL/PECL Clock Source
8.3.27 CMOS Digital Inputs
Figure 46 shows a schematic of the equivalent CMOS digital inputs of the DAC38RF82 (or DAC38RF89). SDIO,
SCLK, TCLK, SLEEP, TESTMODE and TXENABLE have internal pull-down resistors while SDEN, RESET,
TMS, TDI and TRST have internal pull-up resistors. See the Specifications table for logic thresholds. The pull-up
and pull-down circuitry is approximately equivalent to 10 kΩ.
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VDDIO18
VDDIO18
10 kꢀ
SDIO
SCLK
TCLK
SLEEP
SDENB
RESETB
TMS
400 ꢀ
400 ꢀ
internal
digital in
internal
digital in
TDI
TXENABLE
TESTMODE
TRSTB
10 kꢀ
GND
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 46. CMOS Digital Equivalent Input
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8.3.28 DAC Fullscale Output Current
The DAC38RF82 (or DAC38RF89) uses a bandgap reference and control amplifier for biasing the full-scale
output current. The DAC full scale output current is set by a combination of the fixed current through the external
resistor RBIAS (connected to pin BIASJ) and current from course trim current sources:
IOUT
= I + I
RBIAS coarsetrim
FS
(8)
The bias current IBIAS through resistor RBIAS is defined by the on-chip bandgap reference voltage VBG (nominally
0.9 V) and control amplifier. For normal operation, it is recommended that RBIAS is set to 3.6 kΩ for a fixed
current through RBIAS of 250 µA. This current is scaled 128x internally, giving:
V
0.9V
BG
I
= 128ì
= 128ì
= 32 mA
RBIAS
R
3.6 kꢀ
BIAS
(9)
The course trim current sources are configured through SPI register field DACFS in register DACFS (8.5.72), as
follows:
I
= 2mA × DACFS -11
(
)
coarsetrim
(10)
From the discussion above, the DAC full scale output current can be configured from 40 mA (DACFS[3:0] =
1111) down to 10 mA (DACFS[3:0] = 0000). In addition to the full scale signal current set by SPI register DACFS
(8.5.72), an extra DC bias current is required to set the operating point of the output current sources(Table 45).
Table 45. DAC output current
DACFS ( 8.5.72)
Signal current (mA)
Total bias current (mA)(1)
0
1
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
1
1
2
2
3
3
4
5
5
6
6
7
7
8
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
(1) The bias current per each complementary output is half the total bias current
An external decoupling capacitor CEXT of 0.1 μF should be connected externally to terminal EXTIO for
compensation. The full-scale output current can be adjusted from 40 mA down to 10 mA by varying resistor RBIAS
From 3.6 kΩ to 14.4 kΩ.
8.3.29 Current Steering DAC Architecture
The DACs in the DAC38RF82 (or DAC38RF89) consist of a segmented array of NMOS current sources, capable
of sinking a full-scale output current up to 40 mA (see Figure 47). Differential current switches direct the current
to either one of the complimentary output nodes VOUT1/2+ or VOUT1/2-. Complimentary output currents enable
differential operation, thus canceling out common mode noise sources (digital feed-through, on-chip and PCB
noise), dc offsets, even order distortion components, and increasing signal output power by a factor of four.
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VDDOUT18
Zext+
Zext-
VOUT1/2+
VOUT1/2-
100 W
IOUT-
IOUT+
VDEE18N
(-1.8V)
Figure 47. Current Steering DAC Architecture for DAC38RF82 (or DAC38RF89)
Referring to Figure 47, the total output current IOUTFS is fixed, and is switched to either the + or – output by
switches S(N):
IOUT = IOUT + + IOUT-
FS
(11)
Since the output stage is a current sinking architecture, it will denote current into the DAC as + current, and the
current flows IOUT+ and IOUT- into terminals VOUT1/2+ and VOUT1/2- respectively. IOUT+ and IOUT- can be
expressed as:
IOUT ìCODE
FS
16384
IOUT+ =
(12)
IOUT ì 16383 -CODE
(
16384
)
FS
IOUT- =
(13)
where CODE is the decimal representation of the 14-bit DAC core data input word. Note the signal path up to the
DAC is 16-bits and the 2 LSBs are truncated for the DAC core data input word.
8.3.30 DAC Transfer Function
The DAC38RF82 (or DAC38RF89) has a differential output and is terminated internally with a differential 100-Ω
load. The DAC38RF82 (or DAC38RF89) output compliance range is 1.3 to 2.3 V. Note that care should be taken
not to exceed the compliance voltages at node VOUT1/2+ and VOUT1/2-, which would lead to increased signal
distortion.
Referring again to Figure 47, denote the external impedance as seen by VOUT1/2+ as Zext+ and by VOUT1/2-
as Zext-. Note that Zext+ and Zext- should terminate to VDDOUT18 to supply the output current for the DAC.
Also, Zext+ and Zext- are ideally identical to maintain the differential balance of the output. The voltage at nodes
VOUT1/2+ and VOUT1/2- generated by the current flow through the impedance is
IOUT +ì 100ꢀ + Zext +
(
)
IOUT - ìZext -
100ꢀ + Zext + +Zext -
VOUT1/ 2+ =
ì Zext + +
ì Zext +
100ꢀ + Zext + +Zext -
(14)
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IOUT - ì 100ꢀ + Zext -
(
)
ì Zext + +
IOUT +ìZext +
100ꢀ + Zext + +Zext -
VOUT1/ 2- =
ì Zext -
100ꢀ + Zext + +Zext -
(15)
The DAC38RF82 (or DAC38RF89) can be easily configured to drive a doubly terminated 50-Ω cable using a
properly selected 2:1 RF transformer (Figure 48). Note that the center tap of the primary input of the transformer
has to be connected to the VDDOUT18 supply (nominally 1.8 V) to enable a DC current flow into the DAC. The
AC load impedance as seen through 2:1 transformer is 100 Ω, which is split equally into Zext+ = Zext- = 50 Ω.
The DC impedance for the transformer is a short to the center tap of the transformer, which drives the common
mode of VOUT1/2+ and VOUT1/2- to 1.8V. To calculate the peak to peak output swing VOUT1/2PP at each
node, the equations above simplify to:
VOUT1/ 2
=VOUT1/ 2 +
-VOUT1/ 2 +
PP
IOUT+=IOUT IOUT -=0
IOUT-=IOUT ,IOUT+=0
FS
(
)
FS,
(16)
(17)
IOUT ì 50ꢀì150ꢀ IOUT ì 50ꢀì 50ꢀ
FS FS
VOUT1/ 2
=
-
= IOUT ì 25ꢀ
FS
PP
200ꢀ
200ꢀ
With IOUTOUTFS = 40 mA, the swing becomes 1 VPP at each node. With the common mode at 1.8 V due to the
center tap, the voltage at VOUT1/2+ and VOUT1/2- varies between 1.3 and 2.3 V, which is the compliance range
of the DAC.
The differential output swing is 2x VOUT1/2PP, or 2 VPPDIFF. On the load side of the transformer, this reduces to
1.414 VPP, for a transferred load power of 7 dBm (assuming no loss).
2 : 1
VOUT1/2+
RLOAD
100 W
50 W
VOUT1/2-
VDDADAC18
(1.8V)
Figure 48. Driving a 50-Ω Load Using a 2:1 Impedance Ratio Transformer (DAC38RF82 (or DAC38RF89))
The DAC38RF82 (or DAC38RF89) can also be DC coupled. In this case, the termination voltage can be raised
above 1.8 V (for example 2.3 V) so that the common mode for the output pin is nominally 1.8 V.
8.4 Device Functional Modes
8.4.1 Clocking Modes
The DAC38RF82 (or DAC38RF89) has both a single ended clock input DACCLKSE and a differential clock input
DACCLK+/- to clock the device. The clock input is selected by field SEL_EXTCLK_DIFFSE in register
CLK_PLL_CFG (8.5.79). The DAC38RF82 (or DAC38RF89) can be clock directly with a high frequency input
clock at the DAC sample rate (PLL Bypass Mode), or an optional on-chip low-jitter phase-locked loop (PLL) can
be used to generate the high frequency DAC sample clock internally from a lower frequency reference clock
input (PLL Mode).
8.4.2 PLL Bypass Mode Programming
In PLL bypass mode a high quality clock is sourced to the DACCLK inputs. This clock is used to directly clock
the DAC38RF82 (or DAC38RF89) DAC cores. This mode gives the device best performance and is
recommended for extremely demanding applications.
The bypass mode is selected by setting the following:
1. Set field PLL_ENA in register CLK_PLL_CFG (8.5.79) to “0” to bypass the PLL circuitry.
2. Set field PLL_SLEEP in register SLEEP_CONFIG (8.5.70) to “1” to put the PLL and VCO into sleep mode.
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Device Functional Modes (continued)
8.4.3 Internal PLL/VCO
The DAC38RF82 (or DAC38RF89) has an internal clock generation circuit consisting of a PLL and two selectable
VCOs, as shown in Figure 49.
High VCO
PFD
and
charge pump
Output
buffer
DAC
CLK
ó N
PLL_N(4-0)
Feedback
Low VCO
ó M
ó 4
PLL_M(7-0)
Figure 49. Internal PLL/VCO Block Diagram
DAC38RF82 (or DAC38RF89) each have a low VCO (VCO0) and high VCO (VCO1), but they are tuned to
different center frequencies in each device. The VCO frequency ranges for each device are summarized in
Electrical Characteristics - Digital Specifications. The VCO is selected through field PLL_VCOSEL in register
PLL_CONFIG2 (8.5.81), with ‘0’ selecting the low VCO and a ‘1’ the high VCO. The 7 bit VCO tuning code in
field PLL_VCO in register PLL_CONFIG2 (8.5.81) is used to tune the VCO frequency from the lowest frequency
in the range to the highest frequency for the particular VCO used. For the low VCO the center VCO frequency is
achieved with PLL_VCO = 63decimal and for the high VCO the center frequency is achieved with PLL_VCO =
63decimal
.
The supply current, and therefore; the analog signal amplitude in the VCO is controlled using the field
PLL_VCO_RDAC in register PLL_CONFIG1 (8.5.80). This control signal should be set 15decimal initially for 18 mA
supply current in the VCO and ~1.4 VPP single ended oscillation amplitude.
The PLL has no prescaler, so the DAC sample rate is the VCO frequency. In the PLL feedback path a fixed ÷ 4
frequency divider block receives the VCO output clock and divides its frequency by 4. The maximum operating
frequency of the phase-frequency detector (PFD) and charge pump (CP) requires this. The M (feedback) clock
divider takes the output clock signal from the fixed ÷4 block and divides it by a programmable ratio set by the 8-
bit field in field PLL_M_M1 in register PLL_CONFIG1 (8.5.80). The programmable division ratio range is ÷1 to
÷256, and is the value of the 8 bit unsigned binary code + 1. Although it is possible to program the M divider to
÷1, ÷2 and ÷3, these values should not be used. As stated previously the PFD and CP have a finite maximum
operating frequency, which is the VCO frequency divided by the fixed divider ratio multiplied by the minimum
allowable M divider ratio.
PFD_CP
Fmax
= Fvco / Fixed _div x Mdiv
(
)
min
(18)
The N (reference) divider determines the ratio between the input reference clock frequency and the PFD
operating frequency, and is set by the 5-bit field PLL_N_M1 in register CLK_PLL_CFG (8.5.79). The division ratio
range is ÷1 to ÷32, and is the value of the 5-bit unsigned binary code + 1.
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Device Functional Modes (continued)
The charge pump output current amplitude is set using the 4-bit field PLL_CP_ADJ in in register PLL_CONFIG2
(8.5.81). The current amplitude is simply the digital code multiplied by the unit current amplitude of 100 µA. In a
nominal condition, with the DAC38RF82 VCO0 running at 5.898 GHz, and with the M divider set to ÷4, the PFD
will run at 368.625 MHz, and the change pump current should set to 6decimal, which gives 600 µA charge pump
output current for a good phase margin of 69 degrees. If a higher M ratio (for lower PFD frequencies) are
required the charge pump output current must be increased to maintain good loop stability and prevent excessive
peaking in the phase noise response. The charge pump output current setting PLL_CP_ADJ should be adjusted
in relation to the feedback (M) divider ratio PLL_M_M1 according to the following table to maintain a constant
phase margin of 69 degrees.
Table 46. M vs Kp for Maintaining Good Stability
M
4
CP_ADJ
6
9
6
8
12
15
10
Similarly for the DAC38RF82 VCO2 running at 8.847 GHz, and with the M divider set to ÷4, the PFD will run at
552.9375 MHz as shown above. Here the change pump current should set to 6decimal, which gives 600 µA charge
pump output current for a good phase margin of 69 degrees.
8.4.4 CLKOUT
The DAC38RF82 (or DAC38RF89) has a programmable output clock on CLKTX+/- balls that is a divided version
of the internal DAC sample clock, either with or without PLL. Two frequency dividers, either DACCLK/3 or
DACCLK/4, are available by programming field CLK_TX_DIV4 in register CLK_OUT (8.5.71). The output swing
voltage is programmable from approximately 125 to 1460 mVPP-DIFF through field CLK_TX_SWING in register
CLK_OUT (8.5.71).
Field CLK_TX_IDLE in register CLK_OUT (8.5.71) enables an idle state, in which the pins are driven to the
proper common-mode levels in order to charge the external AC coupling caps but the clock output is disabled.
The output clock circuit can be put to sleep by field CLK_TX_SLEEP in register SLEEP_CONFIG (8.5.70).
8.4.5 Serial Peripheral Interface (SPI)
The serial port of the DAC38RF82 (or DAC38RF89) is a flexible serial interface which communicates with
industry standard microprocessors and microcontrollers. The interface provides read/write access to all registers
used to define the operating modes of DAC38RF82 (or DAC38RF89). It is compatible with most synchronous
transfer formats and can be configured as a 3 or 4 terminal interface by SIF4_ENA in register IO_CONFIG
(8.5.2). In both configurations, SCLK is the serial interface input clock and SDEN is serial interface enable. For 3
terminal configuration, SDIO is a bidirectional terminal for both data in and data out. For 4 terminal configuration,
SDIO is bidirectional and SDO is data out only. Data is input into the device with the rising edge of SCLK. Data is
output from the device on the falling edge of SCLK.
The SPI registers are reset by writing a 1 to SPI_RESET in register RESET_CONFIG (8.5.1).
Each read/write operation is framed by signal SDEN (Serial Data Enable Bar) asserted low. The first frame byte
is the instruction cycle which identifies the following data transfer cycle as read or write as well as the 7-bit
address to be accessed. Figure 50 indicates the function of each bit in the instruction cycle and is followed by a
detailed description of each bit. The data transfer cycle consists of two bytes.
Figure 50. Instruction Byte of the Serial Interface
Bit
7 (MSB)
R/W
6
5
4
3
2
1
0
Description
A6
A5
A4
A3
A2
A1
A0
R/W - Identifies the following data transfer cycle as a read or write operation. A high indicates a read operation from DAC38RF82 (or
DAC38RF89) and a low indicates a write operation to DAC38RF82 (or DAC38RF89)
A6:A0 - Identifies the address of the register to be accessed during the read or write operation.
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Figure 51 shows the serial interface timing diagram for a DAC38RF82 (or DAC38RF89) write operation. SCLK is
the serial interface clock input to DAC38RF82 (or DAC38RF89). Serial data enable SDEN is an active low input
to DAC38RF82 (or DAC38RF89). SDIO is serial data input. Input data to DAC38RF82 (or DAC38RF89) is
clocked on the rising edges of SCLK.
Instruction Cycle
Data Transfer Cycle
SDEN\
SCLK
SDIO
rwb
A6
A5
A4
A3
A2
A1
A0
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
tS(SDEN\)
tSCLK
SDEN\
SCLK
SDIO
tS(SDIO) tH(SDIO)
Figure 51. Serial Interface Write Timing Diagram
Figure 52 shows the serial interface timing diagram for a DAC38RF82 (or DAC38RF89) read operation. SCLK is
the serial interface clock input to DAC38RF82 (or DAC38RF89). Serial data enable SDEN is an active low input
to DAC38RF82 (or DAC38RF89). SDIO is serial data input during the instruction cycle. In 3 pin configuration,
SDIO is data out from the DAC38RF82 (or DAC38RF89) during the data transfer cycle, while SDO is in a high-
impedance state. In 4 pin configuration, both SDIO and SDO are data out from the DAC38RF82 (or
DAC38RF89) during the data transfer cycle. At the end of the data transfer, SDIO and SDO will output low on the
final falling edge of SCLK until the rising edge of SDEN when they will 3-state.
Instruction Cycle
Data Transfer Cycle
SDEN\
SCLK
SDIO
SDO
rwb
A6
A5
A4
A3
A2
A1
A0
D15
D15
D14
D14
D13
D13
D12
D12
D11
D11
D10
D10
D9
D9
D8
D8
D7
D7
D6
D6
D5
D5
D4
D4
D3
D3
D2
D2
D1
D1
D0
D0
SDEN\
SCLK
SDIO
SDO
Data n
Data n-1
td(Data)
Figure 52. Serial Interface Read Timing Diagram
n the SIF interface there are four types of registers:
8.4.5.1 NORMAL (RW)
The NORMAL register type allows data to be written and read from. All 16-bits of the data are registered at the
same time. There is no synchronizing with an internal clock thus all register writes are asynchronous with respect
to internal clocks. There are three subtypes of NORMAL:
1. AUTOSYNC: A NORMAL register that causes a sync to be generated after the write is finished. These are
used when it is desirable to synchronize the block after writing the register or if a single field that spans
across multiple registers. For instance, the NCO requires three 16-bit register writes to set the frequency.
Upon writing the last of these registers an autosync is generated to deliver the entire field to the NCO block
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at once, rather than in pieces after each individual register write. For a field that spans multiple registers, all
non-AUTOSYNC registers for the field must be written first before the actual AUTOSYNC register.
2. No RESET Value: These are NORMAL registers, but the reset value cannot be specified. This could be
because the register has some read only bits or some internal logic partially controls the bit values.
3. READ_ONLY (R): Registers that can only be read.
8.4.5.2 WRITE_TO_CLEAR (W0C)
These registers are just like NORMAL registers with one exception. They can be written and read, however,
when the internal logic asynchronously sets a bit high in one of these registers, that bit stays high until it is
written to ‘0’. This way interrupts will be captured and stay constant until cleared by the user.
8.5 Register Maps
Table 47. Register Summary
Address
Reset
Acronym
Register Name
Section
General Configuration Registers (PAGE_SET[2:0] = 000)
0x00
0x01
0x5803
0x1800
0xFFFF
0xFFFF
0x0000
0x0000
variable
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0008
RESET_CONFIG
IO_CONFIG
Chip Reset and Configuration
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
IO Configuration
Lane Signal Detect Alarm Mask
Clock Alarms Mask
0x02
ALM_SD_MASK
ALM_CLK_MASK
ALM_SD_DET
ALM_SYSREF_DET
TEMP_PLLVOLT
Reserved
0x03
0x04
SERDES Loss of Signal Detection Alarms
SYSREF Alignment Circuit Alarms
Temperature Sensor and PLL Loop Voltage
Reserved
0x05
0x06
0x07-0x08
0x09
PAGE_SET
Page Set
8.5.8
0x0A-0x77
0x78
Reserved
Reserved
SYSREF_ALIGN_R
SYSREF12_CNT
SYSREF34_CNT
Reserved
SYSERF Align to r1 and r3 Count
SYSREF Phase Count 1 and 2
SYSREF Phase Count 3 and 4
Reserved
8.5.9
8.5.10
8.5.11
0x79
0x7A
0x7B-0x7E
0x7F
VENDOR_VER
Vendor ID and Chip Version
8.5.12
8.5.13
Multi-DUC Configuration Registers (PAGE_SET[0] = 1 for multi-DUC1, PAGE_SET[1] = 1 for multi-DUC2)
0x0A
0x0B
0x02B0
0x0000
0x2402
0x8300
0x00FF
0x1F83
0xFFFF
0xFFFF
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0010
0x7700
0x0000
MULTIDUC_CFG1
Reserved
Multi-DUC Configuration (PAP, Interpolation)
Reserved
0x0C
MULTIDUC_CFG2
JESD_FIFO
Multi-DUC Configuration (Mixers)
JESD FIFO Control
Alarm Mask 1
8.5.14
8.5.15
8.5.16
8.5.17
8.5.18
8.5.19
8.5.20
0x0D
0x0E
ALM_MASK1
ALM_MASK2
ALM_MASK3
ALM_MASK4
JESD_LN_SKEW
Reserved
0x0F
Alarm Mask 2
0x10
Alarm Mask 3
0x11
Alarm Mask 4
0x12
JESD Lane Skew
0x13-0x16
0x17
Reserved
CMIX
CMIX Configuration
Reserved
8.5.21
8.5.22
0x18
Reserved
0x19
OUTSUM
Output Summation and Delay
Reserved
0x1A-0x1B
0x1C
Reserved
PHASE_NCOAB
PHASE_NCOCD
FREQ_NCOAB
FREQ_NCOCD
SYSREF_CLKDIV
SERDES_CLK
Reserved
Phase offset for AB path NCO
Phase offset for CD path NCO
Frequency for AB path NCO
Frequency for CD path NCO
SYSREF Use for Clock Divider
Serdes Clock Control
Reserved
8.5.23
8.5.24
8.5.25
8.5.26
8.5.27
8.5.28
0x1D
0x1E-0x20
0x21-0x23
0x24
0x25
0x26
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Register Maps (continued)
Table 47. Register Summary (continued)
Address
0x27
Reset
0x1144
0x0000
0x0000
0x0000
0x0000
0x0000
0x1FFF
0x1FFF
0x0000
0x0000
0x0000
0x0800
0x0800
0x0000
0x0000
0x0000
0x0044
0x190A
0x31C3
0x0000
0x0003
0x1300
0x1303
0x0100
0x0F4F
0x1CC1
0x0000
0x00FF
0x00FF
Acronym
SYNCSEL1
Register Name
Sync Source Selection
Sync Source Selection
PAP path AB Gain Attenuation Step
PAP path AB Wait Time at Gain = 0
PAP path CD Gain Attenuation Step
PAP path CD Wait Time at Gain = 0
PAP path AB Configuration
PAP path CD Configuration
Configuration for DAC SPI Constant
DAC SPI Constant
Section
8.5.29
8.5.30
8.5.31
8.5.32
8.5.33
8.5.34
8.5.35
8.5.36
8.5.37
8.5.38
0x28
SYNCSEL2
0x29
PAP_GAIN_AB
PAP_WAIT_AB
PAP_GAIN_CD
PAP_WAIT_CD
PAP_CFG_AB
PAP_CFG_CD
SPIDAC_TEST1
SPIDAC_TEST2
Reserved
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
Reserved
0x32
GAINAB
Gain for path AB
8.5.39
8.5.40
0x33
GAINCD
Gain for path CD
0x34-0x40
0x41
Reserved
Reserved
JESD_ERR_CNT
Reserved
JESD Error Counter
8.5.41
0x42-0x45
0x46
Reserved
JESD_ID1
JESD ID 1
8.5.42
8.5.43
8.5.44
0x47
JESD_ID2
JESD ID 2
0x48
JESD_ID3
JESD ID 3 and Subclass
Reserved
0x49
Reserved
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
JESD_LN_EN
JESD_RBD_F
JESD_K_L
JESD Lane Enable
8.5.45
8.5.46
8.5.47
8.5.48
8.5.49
8.5.50
8.5.51
8.5.52
8.5.53
JESD RBD Buffer and Frame Octets
JESD K and L Parameters
JESD M and S Parameters
JESD N, HD and SCR Parameters
JESD Character Match and Other
JESD Link Configuration Data
JESD Sync Request
JESD_M_S
JESD_N_HD_SCR
JESD_MATCH
JESD_LINK_CFG
JESD_SYNC_REQ
JESD_ERR_OUT
0x50
0x51
0x52
JESD Error Output
JESD Configuration Value used for ILA
Check
0x53
0x54
0x0100
0x8E60
JESD_ILA_CFG1
JESD_ILA_CFG2
8.5.54
8.5.55
JESD Configuration Value used for ILA
Check
0x55-0x5B
0x5C
0x0000
0x0001
0x0000
0x0123
0x4567
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
Reserved
JESD_SYSR_MODE
Reserved
Reserved
JESD SYSREF Mode
Reserved
8.5.56
0x5D-0x5E
0x5F
JESD_CROSSBAR1
JESD_CROSSBAR2
Reserved
JESD Crossbar Configuration 1
JESD Crossbar Configuration 2
Reserved
8.5.57
8.5.58
0x60
0x61-0x63
0x64
JESD_ALM_L0
JESD_ ALM_L1
JESD_ ALM_L2
JESD_ALM_L3
JESD_ALM_L4
JESD_ALM_L5
JESD_ALM_L6
JESD_ALM_L7
ALM_SYSREF_PAP
ALM_CLKDIV1
Reserved
JESD Alarms for Lane 0
JESD Alarms for Lane 1
JESD Alarms for Lane 2
JESD Alarms for Lane 3
JESD Alarms for Lane 4
JESD Alarms for Lane 5
JESD Alarms for Lane 6
JESD Alarms for Lane 7
SYSREF and PAP Alarms
Clock Divider Alarms 1
Reserved
8.5.59
8.5.60
8.5.61
8.5.62
8.5.63
8.5.64
8.5.65
8.5.66
8.5.67
8.5.68
0x65
0x66
0x67
0x68
0x69
0x6A
0x6B
0x6C
0x6D
0x6E-0x77
68
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Register Maps (continued)
Table 47. Register Summary (continued)
Address
Reset
Acronym
Register Name
Section
Miscellaneous Configuration Registers (PAGE_SET[1:0] = 00, PAGE_SET[2] = 1)
0x0A
0x0B
0xFC03
0x0022
0xA002
0xF000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x03F3
0x1000
0x0000
0x0200
0x0308
0x4018
0x0000
0x0018
0x0000
0x0002
0x8228
0x0088
0x0909
0x0000
0x0000
0x0000
CLK_CONFIG
SLEEP_CONFIG
CLK_OUT
Clock Configuration
Sleep Configuration
8.5.69
8.5.70
8.5.71
8.5.72
0x0C
Divided Output Clock Configuration
DAC Fullscale Current
Reserved
0x0D
DACFS
0x0E-0x0F
0x10
Reserved
LCMGEN
Internal sysref generator
Counter for internal sysref generator
SPI SYSREF for internal sysref generator
Reserved
8.5.73
8.5.74
8.5.75
0x11
LCMGEN_DIV
LCMGEN_SPISYSREF
Reserved
0x12
0x13-0x1A
0x1B
DTEST
Digital Test Signals
8.5.76
0x1C-0x22
0x23
Reserved
Reserved
SLEEP_CNTL
SYSR_CAPTURE
Reserved
Sleep Pin Control
8.5.77
8.5.78
0x24
SYSREF Capture Circuit Control
Reserved
0x25-0x30
0x31
CLK_PLL_CFG
PLL_CONFIG1
PLL_CONFIG2
LVDS_CONFIG
PLL_FDIV
Clock Input and PLL Configuration
PLL Configuration 1
8.5.79
8.5.80
8.5.81
8.5.82
8.5.83
0x32
0x33
PLL Configuration 2
0x34
LVDS Output Configuration
Fuse farm clock divider
Reserved
0x35
0x36-0x3A
0x3B
Reserved
SRDS_CLK_CFG
SRDS_PLL_CFG
SRDS_CFG1
SRDS_CFG2
SRDS_POL
Serdes Clock Configuration
Serdes PLL Configuration
Serdes Configuration 1
Serdes Configuration 2
Serdes Polarity Control
Reserved
8.5.84
8.5.85
8.5.86
8.5.87
8.5.88
0x3C
0x3D
0x3E
0x3F
0x40-0x75
0x76
Reserved
SYNCBOUT
JESD204B SYNCB Output
8.5.89
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8.5.1 Chip Reset and Configuration Register (address = 0x00) [reset = 0x5803]
Figure 53. Chip Reset and Configuration Register (RESET_CONFIG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
RW
RW
RW
RW
RW
RW
RW
RW
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
RW
RW
RW
RW
RW
RW
RW
RW
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 48. RESET_CONFIG Field Descriptions
Bit
15
14
Field
Type
RW
Reset
Description
SPI_RESET
ALM_OUT_POL
0
1
This will reset all the SPI registers once programmed.
RW
Changes the polarity of the alarm output.
0= active low
1= active high
13
12
11
10:7
6
ALM_OUT_ENA
SYSCLK_ENA
AUTOLOAD_TRIG
Reserved
RW
RW
RW
RW
RW
RW
0
Turn on the alarm pin
1
Turns on the dividers for the SYSCLK to the Fusefarm
Causes a Fuse AUTOLOAD to be executed.
Reserved
1
0000
ONE_DAC_ONLY
ONE_LINK_ONLY
0
0
When set high only the SLICE0 is available.
5
This needs to be set high when a single link setup is being
programmed to get the correct TXENABLE signal generation
4:2
1
Reserved
RW
RW
RW
000
1
Reserved
INIT_SLICE1
INIT_SLICE0
Puts the multi-DAC2 JESD into initialization state
Puts the multi-DAC1 JESD into initialization state
0
1
70
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8.5.2 IO Configuration Register (address = 0x01) [reset = 0x1800]
Figure 54. IO Configuration Register (IO_CONFIG)
15
0
14
0
13
0
12
1
11
1
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 49. IO_CONFIG Field Descriptions
Bit
Field
Type
Reset
Description
15:14
GPO0_SEL
RW
00
Selects the JESD SYNC_N signal coming out the GPO0 pin.
Both bits can be asserted which does an oring of the SYNC_N
signals from each multi-DUC.
bit 0 = 1 then multi-DUC1 SYNC_N used
bit 1 = 1 then multi-DUC2 SYNC_N is used
13:12
11:10
9:8
SYNC0B_SEL
SYNC1B_SEL
GPO1_SEL
RW
RW
RW
01
10
00
Selects the JESD SYNC_N signal coming out the SYNC0B pin.
Both bits can be asserted which does an oring of the SYNC_N
signals from each multi-DUC.
bit 0 = 1 then multi-DUC1 SYNC_N used
bit 1 = 1 then multi-DUC2 SYNC_N is used
Selects the JESD SYNC_N signal coming out the SYNC1B pin.
Both bits can be asserted which does an oring of the SYNC_N
signals from each multi-DUC.
bit 0 = 1 then multi-DUC1 SYNC_N used
bit 1 = 1 then multi-DUC2 SYNC_N is used
Selects the JESD SYNC_N signal coming out the GPO1 pin.
Both bits can be asserted which does an oring of the SYNC_N
signals from each multi-DUC.
bit 0 = 1 then multi-DUC1 SYNC_N used
bit 1 = 1 then multi-DUC2 SYNC_N is used
7
6
SPI4_ENA
Reserved
ATEST
RW
RW
RW
0
When set to a '1' the chip is in 4 pin SPI interface mode.
Reserved
0
5:0
000000
Select the analog test points:
000000: ATEST is off (ATEST Must be off during normal
operation)
000001, 010001, 000110: VSSCLK
000010: VDDPLL1
000101: VDDCLK
000111, 001010, 010000: VDDAPLL18
001011: VDDAVCO18
001101: VDDS18
001110: VDDE1
001111, 111010, 111011, 111100: DGND
010011: VDDTX1
101001, 110001: AGND
101111, 111101, 111110, 11111: VDDDIG1
110000: VDDA18
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8.5.3 Lane Single Detect Alarm Mask Register (address = 0x02) [reset = 0xFFFF]
Figure 55. Lane Single Detect Alarm Mask Register (ALM_SD_MASK)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
0
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 50. ALM_SD_MASK Field Descriptions
Bit
Field
Type
Reset
Description
Used to mask alarms
bit 15 - bit 8 : Reserved
bit7 : lane 7 loss of signal detect
bit6 : lane 6 loss of signal detect
bit5 : lane 5 loss of signal detect
bit4 : lane 4 loss of signal detect
bit3 : lane 3 loss of signal detect
bit2 : lane 2 loss of signal detect
bit1 : lane1 loss of signal detect
bit0 : lane 0 loss of signal detect
15:0
ALM_SD_MASK
R/W
0xFFFF
8.5.4 Clock Alarms Mask Register (address = 0x03) [reset = 0xFFFF
Figure 56. Clock Alarms Mask Register (ALM_CLK_MASK)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
0
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 51. ALM_CLK_MASK Field Descriptions
Bit
Field
Type
Reset
Description
Used to mask alarms
bit 15 - bit 8 : Reserved
bit 7 : alarm_sysrefphase4
bit 6 : alarm_sysrefphase3
bit 5 : alarm_sysrefphase2
bit 4 : alarm_sysrefphase1
bit 3 : alarm_align_to_r3
bit 2 : alarm_align_to_r1
bit 1 : alarm_sd0_pll
15:0
ALM_CLK_MASK
R/W
0xFFFF
bit 0 : alarm_sd1_pll
72
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8.5.5 SERDES Loss of Signal Detection Alarms Register (address = 0x04) [reset = 0x0000]
Figure 57. SERDES Loss of Signal Detection Alarms Register (ALM_SD_DET)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
0
5
0
4
0
3
0
2
1
1
0
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset
Table 52. ALM_SD_DET Field Descriptions
Bit
Field
Type
Reset
Description
15:8
Reserved
W0C
0x00
Reserved
Loss of signal detect outputs from the SERDES lanes:
bit 7 = lane7 loss of signal
bit 6 = lane6 loss of signal
bit 5 = lane5 loss of signal
7:0
ALM_SD_LOSDET
W0C
0x00
bit 4 = lane4 loss of signal
bit 3 = lane3 loss of signal
bit 2 = lane2 loss of signal
bit 1 = lane1 loss of signal
bit 0 = lane0 loss of signal
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8.5.6 SYSREF Alignment Circuit Alarms Register (address = 0x05) [reset = 0x0000]
Figure 58. SYSREF Alignment Circuit Alarms Register (ALM_SYSREF_DET)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
0
5
0
4
0
3
0
2
1
1
0
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset
Table 53. ALM_SYSREF_DET Field Descriptions
Bit
Field
Type
Reset
Description
15:9
Reserved
W0C
0000000
Reserved
If high the sysrefphase4 state has been observed in the
sysrefalign logic at least once since the last sysrefalign sync.
8
7
6
5
ALM_SYSRPHASE4
ALM_SYSRPHASE3
ALM_SYSRPHASE2
ALM_SYSRPHASE1
W0C
W0C
W0C
W0C
0
0
0
0
If high the sysrefphase3 state has been observed in the
sysrefalign logic at least once since the last sysrefalign sync.
If high the sysrefphase2 state has been observed in the
sysrefalign logic at least once since the last sysrefalign sync.
If high the sysrefphase1 state has been observed in the
sysrefalign logic at least once since the last sysrefalign sync.
If high the align_to_r3 state has been observed in the sysrefalign
logic at least once since the last sysrefalign sync. TI Internal use
only.
4
3
2
ALM_ALIGN_TO_R3
ALM_ALIGN_TO_R1
ALM_SD0_PLL
W0C
W0C
W0C
0
0
0
If high the align_to_r1 state has been observed in the sysrefalign
logic at least once since the last sysrefalign sync. TI Internal use
only.
Driven high if the PLL in the Serdes 0 block goes out of lock. A
false alarm is generated at startup when the PLL is locking. User
will have to reset this bit after start to monitor accurately.
Driven high if the PLL in the Serdes 1 block goes out of lock. A
false alarm is generated at startup when the PLL is locking. User
will have to reset this bit after start to monitor accurately.
1
0
ALM_SD1_PLL
PLL_LOCK
W0C
W0C
0
0
Asserted when PLL is unlocked.
74
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8.5.7 Temperature Sensor and PLL Loop Voltage Register (address = 0x06) [reset = variable]
Figure 59. Temperature Sensor and PLL Loop Voltage Register (TEMP_PLLVOLT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
0
5
0
4
0
3
0
2
1
1
1
0
0
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 54. TEMP_PLLVOLT Field Descriptions
Bit
15:8
7:5
Field
Type
R
Reset
0x00
Description
TEMPDATA
PLL_LFVOLT
Reserved
8 bits of data from the tempurature sensor
PLL Loop filter voltage
R
0b000
0b000
4:0
R
Reserved
8.5.8 Page Set Register (address = 0x09) [reset = 0x0000]
Figure 60. Page Set Register (PAGE_SET)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 55. PAGE_SET Field Descriptions
Bit
Field
Type
Reset
Description
Each bit selects a page that is active. Multiple pages can be
selected at the same time. No bits asserted means that
MASTER is the only page selected.
bit 0 = page0 : multi-DUC1
15:0
PAGE_SET
R/W
0x0000
bit 1 = page1 : multi-DUC2
bit 2 = page2 : DIG_MISC
bit 3-15: Reserved
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8.5.9 SYSREF Align to r1 and r3 Count Register (address = 0x78) [reset = 0x0000]
Figure 61. SYSREF Align to r1 and r3 Count Register (SYSREF_ALIGN_R)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
1
4
1
3
1
2
0
1
0
0
0
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 56. SYSREF_ALIGN_R Field Descriptions
Bit
15:8
7:0
Field
Type
R
Reset
0x00
0x00
Description
ALIGN_TO_R1_CNT
ALIGN_TO_R3_CNT
Part of the SYSREF Align block
Part of the SYSREF Align block
R
8.5.10 SYSREF Phase Count 1 and 2 Register (address = 0x79) [reset = 0x0000]
Figure 62. SYSREF Phase Count 1 and 2 Register (SYSREF12_CNT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
1
4
1
3
1
2
0
1
0
0
1
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 57. SYSREF12_CNT Field Descriptions
Bit
15:8
7:0
Field
Type
R
Reset
0x00
0x00
Description
PHASE2_CNT
PHASE1_CNT
Part of the SYSREF Align block
Part of the SYSREF Align block
R
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8.5.11 SYSREF Phase Count 3 and 4 Register (address = 0x7A) [reset = 0x0000]
Figure 63. SYSREF Phase Count 3 and 4 Register (SYSREF34_CNT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
1
4
1
3
1
2
0
1
1
0
0
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 58. SYSREF34_CNT Field Descriptions
Bit
15:8
7:0
Field
Type
R
Reset
0x00
0x00
Description
PHASE4_CNT
PHASE3_CNT
Part of the SYSREF Align block
Part of the SYSREF Align block
R
8.5.12 Vendor ID and Chip Version Register (address = 0x7F) [reset = 0x0008]]
Figure 64. Vendor ID and Chip Version Register (VENDOR_VER)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
1
4
1
3
1
2
1
1
1
0
1
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 59. VENDOR_VER Field Descriptions
Bit
15
Field
Type
R
Reset
0
Description
AUTOLOAD_DONE
EFC_ERR
Reserved
Asserted when the Fusefarm Autoload sequence is done
The error output from the fuse farm.
Reserved
14:10
9:5
R
00000
00000
01
R
4:3
VENDORID
VERSION
R
TI identification
2:0
R
001
Bits to determine what version of build for the chip.
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8.5.13 Multi-DUC Configuration (PAP, Interpolation) Register (address = 0x0A) [reset = 0x02B0]
Figure 65. Multi-DUC Configuration (PAP, Interolation) Register (MULTIDUC_CFG1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
1
6
0
5
0
4
0
3
1
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 60. MULTIDUC_CFG1 Field Descriptions
Bit
15
14
Field
Type
R/W
R/W
Reset
Description
When asserted the SLICE uses both IQ paths
DUAL_IQ
ISFIR_ENA
0
0
Turns on the inverse sync filter for the AB and CD paths when
programmed to 1.
13
Not used
INTERP
R/W
R/W
0
Not used
12:8
00010
Determines the interpolation amount.
00000: 1x
00001: 2x
00010: 4x
00011: 6x
00100: 8x
00101: 10x
00110: 12x
01000: 16x
01001: 18x
01010: 20x
01100: 24x
7
6
5
4
ALM_ZEROS_TXEN
DAC_COMPLEMENT
ALM_ZEROS_JESD
ALM_OUT_ENA
R/W
R/W
R/W
R/W
1
0
1
1
When asserted any alarm that isn’t masked will mid-level the
DAC output by setting the txenable_from_dig to ‘0’
When asserted the DAC output will be 2's complemented. This
helps with hookup at the board level.
When asserted any alarm that isn’t masked will zero the data
coming out of the JESD block.
When asserted the output from the selected SLICE will be
passed on to the MASTER alarm control if it is also turned on
then the alarm will be sent to the pad_alarm pin.
3
2
1
0
PAPA_ENA
PAPB_ENA
PAPC_ENA
PAPD_ENA
R/W
R/W
R/W
R/W
0
0
0
0
Turns on the Power Amp Protection logic for path A.
Turns on the Power Amp Protection logic for path B.
Turns on the Power Amp Protection logic for path C.
Turns on the Power Amp Protection logic for path D.
78
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8.5.14 Multi-DUC Configuration (Mixers) Register (address = 0x0C) [reset = 0x2402]
Figure 66. Multi-DUC Configuration (Mixers) Register (MULTIDUC_CFG2)
15
0
14
0
13
0
12
0
11
0
10
1
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 61. MULTIDUC_CFG2 Field Descriptions
Bit
Field
Type
Reset
Description
15:14
DAC_BITWIDTH
R/W
0b00
Determines the bit width of the data going to the DAC
00: 14 bits
01: 14 bits
10: 12 bits
11: 11 bits
13
ZERO_INVLD_DATA
R/W
1
When asserted; the data from the JESD block is zeroed in the
mapper to prevent goofy output from the DAC. For test purposes
this bit should be desasserted
12
11
10
9
SHORTTEST_ENA
Reserved
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
1
0
0
0
0
0
0
00
1
Turns on the JESD SHORT pattern test (5.1.6.2)
Reserved
Reserved
Reserved
MIXERAB_ENA
MIXERCD_ENA
MIXERAB_GAIN
MIXERCD_GAIN
NCOAB_ENA
NCOCD_ENA
Reserved
Turns on the mixer for the A and B streams
Turns on the mixer for the C and D streams
Adds 6dB of gain when asserted
Adds 6dB of gain when asserted
When high the full NCO block is turned on.
When high the full NCO block is turned on.
Reserved
8
7
6
5
4
3:2
1
TWOS
When asserted the chip is expecting 2's complement data is
arriving through the JESD; otherwise offset binary is expected
0
Reserved
R/W
0
Reserved
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8.5.15 JESD FIFO Control Register (address = 0x0D) [reset = 0x1300]
Figure 67. JESD FIFO Control Register (JESD_FIFO)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 62. JESD_FIFO Field Descriptions
Bit
Field
Type
Reset
Description
15
FIFO_ZEROS_DATA
R/W
1
When asserted FIFO errors zero the data out of the JESD block.
For test purposes this could be turned off to allow test patterns
in the FIFO.
14:13
12
NOT USED
R/W
R/W
000
0
Not Used
SRDS_FIFO_ALM_CLR
Set to 1 to clear FIFO errors. Must be set to 0 for proper FIFO
operation
11
Not used
R/W
R/W
0
Not used
10:8
FIFO_OFFSET
0000
Used to set the difference between read and write pointers in
the JESD FIFO.
7:1
0
Reserved
R/W
R/W
0
0
Reserved
SPI_TXENABLE
When asserted the internal value of txenable = '1'
8.5.16 Alarm Mask 1 Register (address = 0x0E) [reset = 0x00FF]
Figure 68. Alarm Mask 1 Register (ALM_MASK1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 63. ALM_MASK1 Field Descriptions
Bit
Field
Type
Reset
Description
15:0
ALM_MASK1
R/W
0x00FF
Each bit is used to mask an alarm. Assertion masks the alarm:
bit 15 = mask lane7 lane errors
bit 14 = mask lane6 lane errors
bit 13 = mask lane5 lane errors
bit 12 = mask lane4 lane errors
bit 11 = mask lane3 lane errors
bit 10 = mask lane2 lane errors
bit 9 = mask lane1 lane errors
bit 8 = mask lane0 lane errors
bit 7 = mask lane7 FIFO flags
bit 6 = mask lane6 FIFO flags
bit 5 = mask lane5 FIFO flags
bit 4 = mask lane4 FIFO flags
bit 3 = mask lane3 FIFO flags
bit 2 = mask lane2 FIFO flags
bit 1 = mask lane1 FIFO flags
bit 0 = mask lane0 FIFO flags
80
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8.5.17 Alarm Mask 2 Register (address = 0x0F) [reset = 0xFFFF]
Figure 69. Alarm Mask 2 Register (ALM_MASK2)
15
0
14
0
13
12
11
10
9
0
8
x
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 64. ALM_MASK2 Field Descriptions
Bit
Field
Type
Reset
Description
15:0
ALMS_MASK2
R/W
0xFFFF
Each bit is used to mask an alarm. Assertion masks the alarm:
bit 15 = not used
bit 14 = not used
bit 13 = not used
bit 12 = mask SYSREF errors on link0
bit 11 = mask alarm from JESD shorttest
bit 10 = mask alarm from PAPD
bit 9 = mask alarm from PAPC
bit 8 = mask alarm from PAPB
bit 7 = mask alarm from PAPA
bit 6 = not used
bit 5 = not used
bit 4 = not used
bit 3 = not used
bit 2 = not used
bit 1 = mask alarm_clkdiv192_eq_zero
bit 0 = mask alarm_clkdiv192_eq_mult1
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8.5.18 Alarm Mask 3 Register (address = 0x10) [reset = 0xFFFF]
Figure 70. Alarm Mask 3 Register (ALM_MASK3)
15
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
0
2
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 65. ALM_MASK3 Field Descriptions
Bit
Field
Type
Reset
Description
15:0
ALMS_MASK3
R/W
0xFFFF
Each bit is used to mask an alarm. Assertion masks the alarm:
bit 15 = mask alarm_clkdiv8_eq_zero
bit 14 = mask alarm_clkdiv12_eq_zero
bit 13 = mask alarm_clkdiv16_eq_zero
bit 12 = mask alarm_clkdiv18_eq_zero
bit 11 = mask alarm_clkdiv20_eq_zero
bit 10 = mask alarm_clkdiv32_eq_zero
bit 9 = mask alarm_clkdiv36_eq_zero
bit 8 = mask alarm_clkdiv40_eq_zero
bit 7 = mask alarm_clkdiv48_eq_zero
bit 6 = mask alarm_clkdiv64_eq_zero
bit 5 = mask alarm_clkdiv72_eq_zero
bit 4 = mask alarm_clkdiv80_eq_zero
bit 3 = mask alarm_clkdiv96_eq_zero
bit 2 = maskalarm_ clkdiv128_eq_zero
bit 1 = mask alarm_clkdiv144_eq_zero
bit 0 = mask alarm_clkdiv160_eq_zero
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8.5.19 Alarm Mask 4 Register (address = 0x11) [reset = 0xFFFF]
Figure 71. Alarm Mask 4 Register (ALM_MASK4)
15
0
14
0
13
12
11
10
9
0
8
x
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 66. ALM_MASK4 Field Descriptions
Bit
Field
Type
Reset
Description
15:0
ALMS_MASK4
R/W
0xFFFF
Each bit is used to mask an alarm. Assertion masks the alarm:
bit 15 = mask alarm_clkdiv8_eq_mult1
bit 14 = mask alarm_clkdiv12_eq_mult1
bit 13 = mask alarm_clkdiv16_eq_mult1
bit 12 = mask alarm_clkdiv18_eq_mult1
bit 11 = mask alarm_clkdiv20_eq_mult1
bit 10 = mask alarm_clkdiv32_eq_mult1
bit 9 = mask alarm_clkdiv36_eq_mult1
bit 8 = mask alarm_clkdiv40_eq_mult1
bit 7 = mask alarm_clkdiv48_eq_mult1
bit 6 = mask alarm_clkdiv64_eq_mult1
bit 5 = mask alarm_clkdiv72_eq_mult1
bit 4 = mask alarm_clkdiv80_eq_mult1
bit 3 = mask alarm_clkdiv96_eq_mult1
bit 2 = maskalarm_ clkdiv128_eq_mult1
bit 1 = mask alarm_clkdiv144_eq_mult1
bit 0 = mask alarm_clkdiv160_eq_mult1
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8.5.20 JESD Lane Skew Register (address = 0x12) [reset = 0x0000]
Figure 72. JESD Lane Skew Register (JESD_LN_SKEW)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
0
5
0
4
1
3
0
2
0
1
1
0
0
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 67. JESD_LN_SKEW Field Descriptions
Bit
15:5
4:0
Field
Type
R
Reset
Description
NOT USED
0x0000
0b00000
Not used
MEMIN_LANE_SKEW
R
Measure of the lane skew for each link only. Bits are
READ_ONLY
8.5.21 CMIX Configuration Register (address = 0x17) [reset = 0x0000]
Figure 73. CMIX Configuration Register (CMIX)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
0
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 68. CMIX Field Descriptions
Bit
Field
Type
Reset
Description
These bits turn on the different coarse mixing options.
Combining the different options together can result in every
possible n x Fs/8 [n=0->7]. Below is the valid programming
table:
cmix=(mem_fs8; mem_fs4; mem_fs2; mem_fsm4)
0000 : no mixing
0001 : -fs/4
0010 : fs/2
15:12
CMIX_AB
R/W
0x0
0100 : fs/4
1000 : fs/8
1100 : 3fs/8
1010 : 5fs/8
1110 : 7fs/8
00000000
0
11:4
Reserved
CMIX_CD
R/W
R/W
Reserved
These bits turn on the different coarse mixing options.
Combining the different options together can result in every
possible n x Fs/8 [n=0->7]. Below is the valid programming
table:
cmix=(mem_fs8; mem_fs4; mem_fs2; mem_fsm4)
0000 : no mixing
0001 : -fs/4
0010 : fs/2
3:0
0x0
0100 : fs/4
1000 : fs/8
1100 : 3fs/8
1010 : 5fs/8
1110 : 7fs/8
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8.5.22 Output Summation and Delay Register (address = 0x19) [reset = 0x0000]
Figure 74. Output Summation and Delay Register (OUTSUM)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
1
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 69. OUTSUM Field Descriptions
Bit
Field
Type
R/W
R/W
Reset
0x0
Description
15:12
11:4
OUTPUT_DELAY
Reserved
Delays the output to the DAC 0 to 15 clock cycles
Reserved
0x00
Selects the output summing functions. Each bit selects another
sample to sum. Multiple bits can be selected.
bit 0 = add the path AB sample
3:0
OUTSUM_SEL
R/W
0x0
bit 1 = add the path CD sample
bit 2 = add adjacent DAC path AB sample
bit 3 = add adjacent DAC path CD sample
8.5.23 NCO Phase Path AB Register (address = 0x1C) [reset = 0x0000]
Figure 75. NCO Phase Path AB Register (PHASE_NCOAB)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 70. PHASE_NCOAB Field Descriptions
Bit
Field
Type
Reset
Description
The phase offset for the FULL NCO1 in the AB datapath.
15:0
PHASE_NCO1
Auto
Sync
0x0000
8.5.24 NCO Phase Path CD Register (address = 0x1D) [reset = 0x0000]
Figure 76. NCO Phase Path CD Register (PHASE_NCOCD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 71. PHASE_NCOCD Field Descriptions
Bit
Field
Type
Reset
Description
The phase offset for the FULL NCO2 in the CD datapath.
15:0
PHASE_NCO12
Auto
Sync
0x0000
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8.5.25 NCO Frequency Path AB Register (address = 0x1E-0x20) [reset = 0x0000 0000 0000]
Figure 77. NCO Frequency Path AB Register (FREQ_NCOAB)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
1
2
1
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 72. FREQ_NCOAB Field Descriptions
Bit
Field
Type
Reset
Description
0x0000
0000
47:0
FREQ_NCOAB
R/W
NCO frequency word for AB data path.
0000
8.5.26 NCO Frequency Path CD Register (address = 0x21-0x23) [reset = 0x0000 0000 0000]
Figure 78. NCO Frequency Path CD Register (FREQ_NCOCD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 73. FREQ_NCOCD Field Descriptions
Bit
Field
Type
Reset
Description
0x0000
0000
47:0
FREQ_NCOCD
R/W
NCO frequency word for CD data path.
0000
86
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8.5.27 SYSREF Use for Clock Divider Register (address = 0x24) [reset = 0x0010]
Figure 79. SYSREF Use for Clock Divder Register (SYSREF_CLKDIV)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
0
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 74. SYSREF_CLKDIV Field Descriptions
Bit
Field
Type
Reset
Description
15
Reserved
R/W
0
Reserved
Programmable delay the SYSREF by N dacclk cycles to the
CDRV_SER clock dividers. By offsetting the clock to the
different multi-DUC blocks, clock mixing could potentially be
reduced.
14:12
11:7
CDRVSER_SYSREF_DLY
Not used
R/W
R/W
000
00000
Not used
Determines how SYSREF is used to sync the clock dividers in
the CDRV_SER block.
000 = Don’t use SYSREF pulse
6:4
SYSREF_MODE
R/W
001
001 = Use all SYSREF pulses
010 = Use only the next SYSREF pulse
011 = Skip one SYSREF pulse then use only the next one
100 = Skip one SYSREF pulse then use all pulses.
Delays the SYSREF into the CDRV_SER capture FF through 1
of 4 choices. This allows for extra delay in case the timing of the
clock or SYSREF path isn’t as good as we think.
3:2
1:0
SYSREF_DLY
Reserved
R/W
R/W
00
00
Reserved
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8.5.28 Serdes Clock Control Register (address = 0x25) [reset = 0x7700]
Figure 80. Serdes Clock Control Register (SERDES_CLK)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
0
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 75. SERDES_CLK Field Descriptions
Bit
Field
Type
Reset
Description
This controls the selection of the clk_jesd output
0000 = div4
0001 = div8
0010 = div12
0011 = div16
0100 = div18
0101 = div20
15:12
CLKJESD_DIV
R/W
0x7
0110 = div24
0111 = div32
1001 = div36
1010 = div48
1011 = div64
1100 = div5.333
1101 = div10.666
1110 = div21p333
This controls the selection of the clk_jesd_out output
0000 = div8
0001 = div16
0010 = div32
0011 = div48
0100 = div64
0101 = div80
0110 = div96
0111 = div128
1000 = div144
1001 = div160
1010 = div192
11:8
7:0
CLKJESD_OUT_DIV
R/W
R/W
0x7
0x0
Reserved
Reserved
88
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8.5.29 Sync Source Control 1 Register (address = 0x27) [reset = 0x1144]
Figure 81. Sync Source Control 1 Register (SYNCSEL1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
0
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 76. SYNCSEL1 Field Descriptions
Bit
Field
Type
Reset
Description
Controls the syncing of the double buffered SPI registers for the
mixerAB block. These bits are enables so a ‘1’ in the bit place
allows the sync to pass to the block.
bit 0 = auto-sync from SPI register write
bit 1 = sysref
15:12
SYNCSEL_MIXERAB
R/W
0x1
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
Controls the syncing of the double buffered SPI registers for the
mixerCD block. These bits are enables so a ‘1’ in the bit place
allows the sync to pass to the block.
bit 0 = auto-sync from SPI register write
bit 1 = sysref
11:8
7:4
SYNCSEL_MIXERCD
SYNCSEL_NCOAB
SYNCSEL_NCOCD
R/W
R/W
R/W
0x1
0x4
0x4
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
Controls the syncing of NCOAB accumulators. These bits are
enables so a ‘1’ in the bit place allows the sync to pass to the
block.
bit 0 = ‘0’
bit 1 = sysref
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
Controls the syncing of NCOCD accumulators. These bits are
enables so a ‘1’ in the bit place allows the sync to pass to the
block.
bit 0 = ‘0’
3:0
bit 1 = sysref
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
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8.5.30 Sync Source Control 2 Register (address = 0x28) [reset = 0x0000]
Figure 82. Sync Source Control 2 Register (SYNCSEL2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 77. SYNCSEL2 Field Descriptions
Bit
Field
Type
R/W
R/W
Reset
0x0
Description
15:12
11:8
Reserved
Reserved
SYNCSEL_PAPAB
0x0
Select the sync for the PAP A and B.
bit 0 = ‘0’
bit 1 = sysref
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
7:4
SYNCSEL_PAPCD
R/W
0x0
Select the sync for the PAP C and D.
bit 0 = ‘0’
bit 1 = sysref
bit 2 = sync_out from JESD
bit 3 = mem_spi_sync
3:2
1
Reserved
SPI_SYNC
Reserved
R/W
R/W
R/W
0b00
Reserved
0
0
This is used to generate the SPI_SYNC signal
Reserved
0
8.5.31 PAP path AB Gain Attenuation Step Register (address = 0x29) [reset = 0x0000]
Figure 83. PAP path AB Gain Attenuation Step Register (PAP_GAIN_AB)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 78. PAP_GAIN_AB Field Descriptions
Bit
15:10
9:0
Field
Type
Reset
000000
0x000
Description
NOT USED
PAPAB_GAIN_STEP
RW
Not Used
Gain attenuation step
90
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8.5.32 PAP path AB Wait Time Register (address = 0x2A) [reset = 0x0000]
Figure 84. PAP path AB Wait Time Register (PAP_WAIT_AB)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 79. PAP_WAIT_AB Field Descriptions
Bit
15:10
9:0
Field
Type
Reset
R/W
Description
Reserved
PAPAB_WAIT
000000
0x000
Reserved
R/W
Number of clock cycles to wait after gain = 0
8.5.33 PAP path CD Gain Attenuation Step Register (address = 0x2B) [reset = 0x0000]
Figure 85. PAP path CD Gain Attenuation Step Register (PAP_GAIN_CD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 80. PAP_GAIN_CD Field Descriptions
Bit
15:10
9:0
Field
Type
R/W
R/W
Reset
000000
0x000
Description
Not Used
Not Used
PAPCD_GAIN_STEP
Gain attenuation step
8.5.34 PAP Path CD Wait Time Register (address = 0x2C) [reset = 0x0000]
Figure 86. PAP path CD Wait Time Register (PAP_WAIT_CD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 81. PAP_WAIT_CD Field Descriptions
Bit
15:10
9:0
Field
Type
R/W
R/W
Reset
000000
0x000
Description
Reserved
PAPCD_WAIT
Reserved
Number of clock cycles to wait after gain = 0
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8.5.35 PAP path AB Configuration Register (address = 0x2D) [reset = 0x0FFF]
Figure 87. PAP path AB Configuration Register (PAP_CFG_AB)
15
0
14
0
13
12
0
11
0
10
0
9
0
8
x
Reserved
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 82. PAP_CFG_AB Field Descriptions
Bit
Field
Type
Reset
Description
Controls the length of the delayline in the PAP AB logic.
00 : N =32
15:14
PAPAB_SEL_DLY
R/W
00
01 : N = 64
10 : N = 128
11 : Not Valid
13
Reserved
R/W
R/W
0
Reserved
12:0
PAPAB_THRESH
0xFFF
The threshold for the PAP AB trigger.
8.5.36 PAP path CD Configuration Register (address = 0x2E) [reset = 0x0FFF]
Figure 88. PAP path CD Configuration Register (PAP_CFG_CD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
1
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 83. PAP_CFG_CD Field Descriptions
Bit
Field
Type
Reset
Description
Controls the length of the delay line in the PAP CD logic.
00 : N = 32
01 : N = 64
10 : N = 128
11 : Not Valid
15:14
PAPCD_SEL_DLY
R/W
00
13
Reserved
R/W
R/W
0
Reserved
12:0
PAPCD_THRESH
0xFFF
The threshold for the PAP CD trigger.
92
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8.5.37 DAC SPI Configuration Register (address = 0x2F) [reset = 0x0000]
Figure 89. DAC SPI Constant 1 Register (SPIDAC_TEST1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
1
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 84. SPIDAC_TEST1 Field Descriptions
Bit
Field
Type
Reset
Description
15:1
Reserved
R/W
0x0000
Reserved
When asserted the DAC output is set to the value in register
SPIDAC. This can be used for trim setting and other static tests.
0
SPIDAC_ENA
R/W
0
8.5.38 DAC SPI Constant Register (address = 0x30) [reset = 0x0000]
Figure 90. DAC SPI Constant Register (SPIDAC_TEST2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 85. SPIDAC_TEST2 Field Descriptions
Bit
Field
Type
Reset
Description
This value replaces the data at the output of the JESD so that
the DAC value can be controlled
15:0
SPIDAC
R/W
0x0000
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8.5.39 Gain for path AB Register (address = 0x32) [reset = 0x0000]
Figure 91. Gain for path AB Register (GAINAB)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 86. GAINAB Field Descriptions
Bit
15
Field
Type
R/W
R/W
Reset
0
Description
GAINAB_ENA
Reserved
Turns on the path AB gain block
Reserved
14:12
0x0
Extra control of gain in the GAINAB block. This allows a fix gain
to be added to the signal if needed.
11:0
GAINAB
R/W
0x400
8.5.40 Gain for path CD Register (address = 0x33) [reset = 0x0000]
Figure 92. Gain for path CD Register (GAINCD)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 87. GAINCD Field Descriptions
Bit
15
Field
Type
R/W
R/W
Reset
0
Description
GAINCD_ENA
Reserved
Turns on the Path CD gain block
Reserved
14:12
0x0
Extra control of gain in the GAINCD block. This allows a fix gain
to be added to the signal if needed.
11:0
GAINCD
R/W
0x400
94
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8.5.41 JESD Error Counter Register (address = 0x41) [reset = 0x0000]
Figure 93. JESD Error Counter Register (JESD_ERR_CNT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
0
4
0
3
0
2
0
1
0
0
1
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 88. JESD_ERR_CNT Field Descriptions
Bit
Field
Type
Reset
Description
This is the error count for the JESD link. This is a 16bit value
that is not cleared until the JESD synchronization is required or
errcnt_clr is programmed to '1'
15:0
JESD_ERR_CNT
R
0x0000
8.5.42 JESD ID 1 Register (address = 0x46) [reset = 0x0044]
Figure 94. JESD ID 1 Register (JESD_ID1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R
R
R
R
R
R
R
R
7
0
6
1
5
0
4
0
3
0
2
1
1
1
0
0
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 89. JESD_ID1 Field Descriptions
Bit
15:11
10:6
5:1
Field
Type
R/W
R/W
R/W
R/W
Reset
00000
00001
00010
0
Description
LID0
JESD ID for lane 0
JESD ID for lane 1
JESD ID for lane 2
Reserved
LID1
LID2
0
Reserved
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8.5.43 JESD ID 2 Register (address = 0x47) [reset = 0x190A]
Figure 95. JESD ID 2 Register (JESD_ID2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
R
R
R
R
R
R
R
R
7
0
6
1
5
0
4
0
3
0
2
1
1
1
0
1
R
R
R
R
R
R
R
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 90. JESD ID 2 Register (JESD_ID2)
Bit
15:11
10:6
5:1
Field
Type
R/W
R/W
R/W
R/W
Reset
00011
00100
00101
0
Description
LID3
JESD ID for lane 3
JESD ID for lane 4
JESD ID for lane 5
Reserved
LID4
LID5
0
Reserved
8.5.44 JESD ID 3 and Subclass Register (address = 0x48) [reset = 0x31C3]
Figure 96. JESD ID 3 Register (JESD_ID3)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 91. JESD_ID3 Field Descriptions
Bit
15:11
10:6
5:4
Field
Type
R/W
R/W
R/W
Reset
00110
00111
00
Description
LID6
JESD ID for lane 6
JESD ID for lane 7
Reserved
LID7
Reserved
Selects the JESD subclass supported. Note: “001” is subclass 1
and “000” is subclass 0 they are the only modes supported; not
used for operation but used for configuration. See field
MIN_LATENCY_ENA in register JESD_MATCH (9.5.46) for use
in subclass0
3:1
0
SUBCLASSV
JESDV
R/W
R/W
001
1
Selects the version of JESD support(0=A; 1=B) NOTE: JESD
204B is only supported version.
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8.5.45 JESD Lane Enable Register (address = 0x4A) [reset = 0x0003]
Figure 97. JESD Lane Enable Register (JESD_LN_EN)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 92. JESD_LN_EN Field Descriptions
Bit
Field
Type
Reset
Description
Turn on each lane as needed. Signal is active high.
bit 15 : lane7 enable
bit 14 : lane6 enable
bit 13 : lane5 enable
15:8
LANE_ENA
0x00
bit 12 : lane4 enable
bit 11 : lane3 enable
bit 10 : lane2 enable
bit 9 : lane1 enable
bit 8 : lane0 enable
Set to select and verify link layer test sequences. The error for
these sequences comes out the lane alarms bit0. 1= a fail and 0
= pass.
00 : test sequence disabled
7:6
JESD_TEST_SEQ
00
01 : verify repeating D.21.5 high frequency pattern for random
jitter
10 : verify repeating K.28.5 mixed frequency pattern for
deterministic jitter
11 : verify repeating ILA sequence
5:2
1:0
Reserved
0x0
11
Reserved
Used to tell the JESD block how many clock phases are being
used for lanes.
00 = 1 phase
01 = 2 phases
10 = 4 phases
11 = 8 phases
JESD_PHASE_MODE
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8.5.46 JESD RBD Buffer and Frame Octets Register (address = 0x4B) [reset = 0x1300]
Figure 98. JESD RBD Buffer and Frame Octets Register (JESD_RBD_F)
15
14
13
12
0
11
0
10
0
9
0
8
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 93. JESD_RBD_F Field Descriptions
Bit
Field
Type
Reset
Description
15:13
Reserved
R/W
00
Reserved
This controls the amount of elastic buffers being used in the
JESD. Larger numbers will mean more latency; but smaller
numbers may not hold enough data to capture the input skew.
This value must always be ≤ mem_k
12:8
7:0
RBD
R/W
R/W
10011
0x00
F_M1
This is the number of octets in the frame - 1
8.5.47 JESD K and L Parameters Register (address = 0x4C) [reset = 0x1303]
Figure 99. JESD K and L Parameters Register (JESD_K_L)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 94. JESD_K_L Field Descriptions
Bit
15:13
12:8
7:5
Field
Type
R/W
R/W
R/W
R/W
Reset
000
Description
Reserved
K_M1
Reserved
10011
0
The number of frames in a multi-frame - 1. 0 ≤ k - 1 < 32
Reserved
Reserved
L_M1
4:0
00011
The number of lanes used by the JESD - 1. 0 ≤ L -1 < 8
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8.5.48 JESD M and S Parameters Register (address = 0x4D) [reset = 0x0100]
Figure 100. JESD M and S Parameters Register (JESD_M_S)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 95. JESD_M_S Field Descriptions
Bit
15:8
7:5
Field
Type
R/W
R/W
R/W
Reset
0x01
000
Description
M_M1
Reserved
S_M1
The number of streams per frame - 1. 0 ≤ M - 1 < 256
Reserved
4:0
00000
The number of samples per stream per frame - 1.
8.5.49 JESD N, HD and SCR Parameters Register (address = 0x4E) [reset = 0x0F4F]
Figure 101. JESD N, HD and SCR Parameters Register (JESD_N_HD_SCR)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
1
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 96. JESD_N_HD_SCR Field Descriptions
Bit
15:13
12:8
7
Field
Type
R/W
R/W
R/W
R/W
R/W
R/W
Reset
000
01111
0
Description
Reserved
NPRIME_M1
Reserved
HD
Reserved
The number of adjusted bits per sample - 1
Reserved
6
1
High density mode. Samples can cross the lane boundary
Turn on the scrambler
5
SCR
0
4:0
N_M1
01111
The number of bits per sample - 1
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8.5.50 JESD Character Match and Other Register (address = 0x4F) [reset = 0x1CC1]
Figure 102. JESD Character Match and Other Parameters Register (JESD_MATCH)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
1
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 97. JESD_MATCH Field Descriptions
Bit
Field
Type
Reset
Description
15:8
MATCH_DATA
R/W
0x1C
The character to match for buffer release. Normally it is a
/R/=/K28.0/-0x1C but with these bits the user can program the
value.
7
6
5
MATCH_SPECIFIC
MATCH_CTRL
R/W
R/W
R/W
1
1
0
Match a specific charater to start the JESD buffering when
asserted; otherwise the first non-K will start the buffering.
When asserted the match character is a CONTROL character
instead of a DATA character.
NO_LANE_SYNC
Assert if the TX side does not support lane initialization. This
way the RX won’t flag errors in the configuration portion of the
ILA.
4:2
1
Not Used
R/W
R/W
000
0
Not Used
MIN_LATENCY_ENA
Enable minimum latency when set. This is needed for subclass
0 support.
0
JESD_COMMAALIGN_ENA
R/W
1
When asserted the JESD block SERDES comma align signal
will be added with the SERDES ALIGN bit(0) to control when to
shut off comma alignment. When this bit is deasserted; then the
programmed bit(spi_config62(11)) is the only control.
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8.5.51 JESD Link Configuration Data Register (address = 0x50) [reset = 0x0000]
Figure 103. JESD Link Configuration Data Register (JESD_LINK_CFG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
0
2
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 98. JESD_Link_CFG Field Descriptions
Bit
Field
Type
Reset
Description
15-12
ADJCNT
R/W
0x0
Lane configuration data for link. Reserved by DAC38RF8x
except for lane configuration checking.
11
10-7
6-2
ADJDIR
BID
R/W
R/W
R/W
R/W
0
Lane configuration data for link. Reserved by DAC38RF8x
except for lane configuration checking.
0x0
00000
00
Lane configuration data for link. Reserved by DAC38RF8x
except for lane configuration checking.
CF
Lane configuration data for link. Reserved by DAC38RF8x
except for lane configuration checking.
1-0
CS
Lane configuration data for link. Reserved by DAC38RF8x
except for lane configuration checking.
8.5.52 JESD Sync Request Register (address = 0x51) [reset = 0x00FF]
Figure 104. JESD Sync Request Register (JESD_SYNC_REQ)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 99. JESD_SYNC_REQ Field Descriptions
Bit
Field
Type
Reset
Description
15:8
DID
R/W
0x00
Lane configuration
These bits select which errors cause a sync request. Sync
requests take priority over the error notification; so if sync
request isn’t desired; set these bits to a ‘0’.
bit 7 = multi-frame alignment error
bit 6 = frame alignment error
7:0
SYNC_REQUEST
R/W
0xFF
bit 5 = link configuration error
bit 4 = elastic buffer overflow (bad RBD value)
bit 3 = elastic buffer end char mismatch (match_ctrl match_data)
bit 2 = code synchronization error
bit 1 = 8b/10b not-in-table code error
bit 0 = 8b/10b disparity error
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8.5.53 JESD Error Output Register (address = 0x52) [reset = 0x00FF]
Figure 105. JESD Error Output Register (JESD_ERR_OUT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
0
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 100. JESD_ERR_OUT Field Descriptions
Bit
Field
Type
Reset
Description
15:10
Reserved
R/W
000000
Reserved
Assertion means that errors will not be reported on the sync_n
output.
9
8
DISABLE_ERR_RPT
PHADJ
R/W
R/W
0
0
Lane configuration
These bits select the errors generated are counted in the err_c
for the link. The bits also control what signals are sent out the
pad_syncb pin for error notification.
bit 7 = multi-frame alignment error
bit 6 = frame alignment error
7:0
ERR_ENA
R/W
0xFF
bit 5 = link configuration error
bit 4 = elastic buffer overflow (bad RBD value)
bit 3 = elastic buffer end char mismatch (match_ctrl match_data)
bit 2 = code synchronization error
bit 1 = 8b/10b not-in-table code error
bit 0 = 8b/10b disparity error
8.5.54 JESD ILA Check 1 Register (address = 0x53) [reset = 0x0100]
Figure 106. JESD ILA Check 1 Register (JESD_ILA_CFG1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
0
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 101. JESD_ILA_CFG1 Field Descriptions
Bit
Field
Type
Reset
Description
JESD M-1 configuration value used only for ILA checking; may
be set independently of the actual JESD mode
15:8
ILA_M
R/W
0x01
JESD F-1 configuration value used only for ILA checking; may
be set independently of the actual JESD mode
7:0
ILA_F
R/W
0x00
102
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8.5.55 JESD ILA Check 2 Register (address = 0x54) [reset = 0x8E60]
Figure 107. JESD ILA Check 2 Register (JESD_ILA_CFG2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
0
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 102. JESD_ILA_CFG2 Field Descriptions
Bit
Field
Type
Reset
Description
JESD HD configuration value used only for ILA checking; may
be set independently of the actual JESD mode
15
ILA_HD
R/W
1
JESD L-1 configuration value used only for ILA checking; may
be set independently of the actual JESD mode
14:10
9:5
ILA_L
ILA_K
ILA_S
R/W
R/W
R/W
00011
10011
00000
JESD K-1 configuration value used only for ILA checking; may
be set independently of the actual JESD mode
JESD S-1 configuration value used only for ILA checking; may
be set independently of the actual JESD mode
4:0
8.5.56 JESD SYSREF Mode Register (address = 0x5C) [reset = 0x0001]
Figure 108. JESD SYSREF Mode Register (JESD_SYSR_MODE)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 103. JESD_SYSR_MODE Field Descriptions
Bit
15:4
3
Field
Type
R/W
R/W
Reset
0x000
0
Description
Reserved
ERR_CNT_CLR
Reserved
A transition from 0->1 causes the error_cnt to be cleared
Determines how SYSREF is used in the JESD synchronizing
block.
000 = Don’t use SYSREF pulse
001 = Use all SYSREF pulses
2:0
SYSREF_MODE
R/W
001
010 = Use only the next SYSREF pulse
011 = Skip one SYSREF pulse then use only the next one
100 = Skip one SYSREF pulse then use all pulses.
101 = skip two SYSREFs and then use one
110 = skip two SYSREFs and then use all
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8.5.57 JESD Crossbar Configuration 1 Register (address = 0x5F) [reset = 0x0123]
Figure 109. JESD Crossbar Configuration 1 Register (JESD_CROSSBAR1)
15
14
0
13
0
12
0
11
10
0
9
0
8
x
Reserved
R/W
Reserved
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
1
3
1
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 104. JESD_CROSSBAR1 Field Descriptions
Bit
Field
Type
Reset
Description
15
Reserved
R/W
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
14:12
OCTETPATH0_SEL
R/W
R/W
R/W
R/W
R/W
R/W
R/W
000
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
111 = treat as lane7
11
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
10:8
OCTETPATH1_SEL
001
111 = treat as lane7
7
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
6:4
OCTETPATH2_SEL
010
111 = treat as lane7
3
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
2:0
OCTETPATH3_SEL
011
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
111 = treat as lane7
104
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8.5.58 JESD Crossbar Configuration 2 Register (address = 0x60) [reset = 0x4567]
Figure 110. JESD_CROSSBAR2 Field DBits to Determine What Version of Build for the chip.escriptions
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
1
4
0
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 105. JESD_CROSSBAR2 Field Descriptions
Bit
Field
Type
Reset
Description
15
Reserved
R/W
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
14:12
OCTETPATH4_SEL
R/W
R/W
R/W
R/W
R/W
R/W
R/W
100
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
111 = treat as lane7
11
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
10:8
OCTETPATH5_SEL
101
111 = treat as lane7
7
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
6:4
OCTETPATH6_SEL
110
111 = treat as lane7
3
Reserved
0
Reserved
These bits are used by the cross-bar switch to map any lane to
any other lane. The 3 bit term tells the mapper block what lane
this particular lane is supposed to be treated as.
000 = treat as lane0
001 = treat as lane1
010 = treat as lane2
2:0
OCTETPATH7_SEL
111
011 = treat as lane3
100 = treat as lane4
101 = treat as lane5
110 = treat as lane6
111 = treat as lane7
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8.5.59 JESD Alarms for Lane 0 Register (address = 0x64) [reset = 0x0000]
Figure 111. JESD Alarms for Lane 0 Register (JBits to determine what version of build for the
chip.ESD_ALM_L0)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
0
2
1
1
0
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 106. JESD_ALM_L0 Field Descriptions
Bit
Field
Type
Reset
Description
Lane0 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE0_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane0 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO0_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
106
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8.5.60 JESD Alarms for Lane 1 Register (address = 0x65 01100101) [reset = 0x0000]
Figure 112. JESD Alarms for Lane 1 Register (JESD_ALM_L1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
0
2
1
1
0
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 107. JESD_ALM_L1 Field Descriptions
Bit
Field
Type
Reset
Description
Lane1 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE1_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane1 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO1_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
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8.5.61 JESD Alarms for Lane 2 Register (address = 0x66) [reset = 0x0000]
Figure 113. JESD Alarms for Lane 2 Register (JESD_ALM_L2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
0
2
1
1
1
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 108. JESD_ALM_L2 Field Descriptions
Bit
Field
Type
Reset
Description
Lane2 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE2_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane2 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO2_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
108
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8.5.62 JESD Alarms for Lane 3 Register (address = 0x67) [reset = 0x0000]
Figure 114. JESD Alarms for Lane 3 Register (JESD_ALM_L3)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
0
2
1
1
1
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 109. JESD_ALM_L3 Field Descriptions
Bit
Field
Type
Reset
Description
Lane3 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE3_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane3 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO3_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
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8.5.63 JESD Alarms for Lane 4 Register (address = 0x68) [reset = 0x0000]
Figure 115. JESD Alarms for Lane 4 Register (JESD_ALM_L4)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
0
1
0
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 110. JESD_ALM_L4 Field Descriptions
Bit
Field
Type
Reset
Description
Lane4 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE4_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane4 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO4_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
110
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8.5.64 JESD Alarms for Lane 5 Register (address = 0x69) [reset = 0x0000]
Figure 116. 8.4.60 JESD Alarms for Lane 5 Register (address = 0x69) [reset = 0x0000]
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
0
1
0
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 111. JESD_ALM_L5 Field Descriptions
Bit
Field
Type
Reset
Description
Lane5 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE5_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane5 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO5_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
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8.5.65 JESD Alarms for Lane 6 Register (address = 0x6A [reset = 0x0000]
Figure 117. JESD Alarms for Lane 6 Register (JESD_ALM_L6)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
0
1
1
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 112. JESD_ALM_L6 Field Descriptions
Bit
Field
Type
Reset
Description
Lane6 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE6_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane6 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO6_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
112
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8.5.66 JESD Alarms for Lane 7 Register (address = 0x6B) [reset = 0x0000]
Figure 118. JESD Alarms for Lane 7 Register (JESD_ALM_L7)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
0
1
1
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 113. JESD Alarms for Lane 7 Register (JESD_ALM_L7)
Bit
Field
Type
Reset
Description
Lane7 errors:
bit 15 = multiframe alignment error
bit 14 = frame alignment error
bit 13 = link configuration error
bit 12 = elastic buffer overflow (bad RBD value)
bit 11 = elastic buffer match error. The first non-/K/ doesn’t
match “match_ctrl” and “match_data” programmed values.
bit 10 = code synchronization error
15:8
ALM_LANE7_ERR
W0C
0x00
bit 9 = 8b/10b not-in-table code error
bit 8 = 8b/10b disparity error
7:4
3:0
Reserved
W0C
W0C
0x0
0x0
Reserved
Lane7 FIFO errors:
bit 3 = write_error : High if write request and FIFO is full (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 2 = write_full : FIFO is FULL
ALM_FIFO7_FLAGS
bit 1 = read_error : High if read request with empty FIFO (NOTE:
only released when JESD block is initialize with mem_init_state)
bit 0 = read_empty : FIFO is empty
8.5.67 SYSREF and PAP Alarms Register (address = 0x6C) [reset = 0x0000]
Figure 119. SYSREF and PAP Alarms Register (ALM_SYSREF_PAP)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
1
1
0
0
0
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 114. ALM_SYSREF_PAP Field Descriptions
Bit
15:13
12
Field
Type
W0C
W0C
W0C
Reset
Description
Reserved
0
Reserved
ALM_SYSREF_ERR
ALM_FROM_SHORTTEST
Alarm caused when the sysref is placed at an incorrect location
This is the alarm from JESD during the SHORT TEST checking.
11
The alarms from the PAP blocks indicated which PAP was
triggered. bit0 = PAPA bit1 = PAPB bit2 = PAPC bit3 = PAPD
10:7
6:2
1
ALM_PAP
W0C
W0C
W0C
W0C
0x0
0x0
0
Reserved
Reserved
This is asserted if the clkdiv192 in the CDRV_SER shift register
is all zeros.
ALM_DIV192_ZERO
Not Used
0
0
Not Used
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8.5.68 Clock Divider Alarms 1 Register (address = 0x6D) [reset = 0x0000]
Figure 120. Clock Divider Alarms 1 Register (ALM_CLKDIV1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
7
0
6
1
5
1
4
0
3
1
2
1
1
0
0
1
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset; -n = value after reset
Table 115. ALM_CLKDIV1 Field Descriptions
Bit
Field
Type
Reset
Description
15
ALM_DIV8_ZERO
W0C
0
Asserted if the clkdiv8 in the CDRV_SER shift register is all
zeros.
14
13
12
11
10
9
ALM_DIV12_ZERO
ALM_DIV16_ZERO
ALM_DIV24_ZERO
ALM_DIV20_ZERO
ALM_DIV32_ZERO
ALM_DIV36_ZERO
ALM_DIV40_ZERO
ALM_DIV48_ZERO
ALM_DIV64_ZERO
ALM_DIV72_ZERO
ALM_DIV80_ZERO
ALM_DIV96_ZERO
ALM_DIV128_ZERO
ALM_DIV144_ZERO
ALM_DIV160_ZERO
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
W0C
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Asserted if the clkdiv12 in the CDRV_SER shift register is all
zeros.
Asserted if the clkdiv16 in the CDRV_SER shift register is all
zeros.
Asserted if the clkdiv24 in the CDRV_SER shift register is all
zeros. (Connected to the div18 port)
Asserted if the clkdiv20 in the CDRV_SER shift register is all
zeros.
Asserted if the clkdiv32 in the CDRV_SER shift register is all
zeros.
Asserted if the clkdiv36 in the CDRV_SER shift register is all
zeros.
8
Asserted if the clkdiv40 in the CDRV_SER shift register is all
zeros.
7
Asserted if the clkdiv48 in the CDRV_SER shift register is all
zeros.
6
Asserted if the clkdiv64 in the CDRV_SER shift register is all
zeros.
5
Asserted if the clkdiv72 in the CDRV_SER shift register is all
zeros.
4
Asserted if the clkdiv80 in the CDRV_SER shift register is all
zeros.
3
Asserted if the clkdiv96 in the CDRV_SER shift register is all
zeros.
2
Asserted if the clkdiv128 in the CDRV_SER shift register is all
zeros.
1
Asserted if the clkdiv144 in the CDRV_SER shift register is all
zeros.
0
Asserted if the clkdiv160 in the CDRV_SER shift register is all
zeros.
114
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8.5.69 Clock Configuration Register (address = 0x0A) [reset = 0xF000]
Figure 121. Clock Configuration Register (CLK_CONFIG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 116. CLK_CONFIG Field Descriptions
Bit
Field
Type
Reset
Description
15
RCLK_SYNC_ENA
RW
1
When asserted the sysref is used to sync the clock divider in the
centralclkdiv. This should be disabled after initial syncing.
14
FRCLK_DIV_ENA
RW
1
When asserted the full rate clock divider that provides the DIV4
phases to the DACs is enabled
13
12
11
10
9:2
1
DACA_FRCLK_ENA
DACB_FRCLK_ENA
DACA_DUMDATA
DACB_DUMDATA
Reserved
RW
RW
RW
RW
RW
RW
RW
1
When asserted the full rate clock to the DACA block is enabled
When asserted the full rate clock to the DACB block is enabled
Enables distortion enhancement for DACA when set high
Enables distortion enhancement for DACB when set high
Reserved
1
0
0
0x000
QRCLOCK_DACA_ENA
QRCLOCK_DACB_ENA
1
1
Turns on the quarter rate clock for DACA when '1'
Turns on the quarter rate clock for DACB when '1'
0
8.5.70 Sleep Configuration Register (address = 0x0B) [reset = 0x0022]
Figure 122. Clock Configuration Register (SLEEP_CONFIG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 117. SLEEP_CONFIG Field Descriptions
Bit
15:9
8
Field
Type
RW
RW
RW
RW
RW
RW
Reset
Description
Reserved
0000000
Reserved
VBGR_SLEEP
Reserved
0
0
0
1
0
Turns off the 'bandgap-over-R' bias
Reserved
7
6
TSENSE_SLEEP
PLL_SLEEP
CLKRECV_SLEEP
Turns off the temperature sensor
5
Puts the PLL into sleep mode (FUSE Controlled)
4
When asserted the clock input receiver gets put into sleep
mode. This also affects the FIFO_OSTR receiver as well.
3
2
1
0
DACA_SLEEP
DACB_SLEEP
CLK_TX_SLEEP
Reserved
RW
RW
RW
RW
0
0
1
0
Puts the DACA into sleep mode
Puts the DACB into sleep mode
When asserted the PLL TX clock output is in low power mode.
Reserved
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8.5.71 Divided Output Clock Configuration Register (address = 0x0C) [reset = 0x8000]
Figure 123. Divided Output Clock Configuration Register (CLK_OUT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 118. CLK_OUT Field Descriptions
Bit
Field
Type
Reset
Description
15
CLK_TX_IDLE
R/W
1
When high puts the CLK_TX circuitry in idle mode during which
the CLKTX+ and CLKTX- output pins are driven to the proper
common-mode levels in order to charge the external AC
coupling caps. When low allows the divided clock to be driven
onto the CLKTX+ and CLKTX- output pins.
14:13
CLK_TX_DIVSELECT
R/W
01
Selects either div2, div3 or div 4 output.
00 = divided by 3
01 = divided by 4
10 = divided by 2
11 = not valid
12
Reserved
R/W
R/W
0
Reserved
11:8
CLK_TX_SWING
0x0
Sets desired swing on CLKTX+ and CLKTX- outputs in mVpp-
diff
0x0 125
0x1 232
0x2 337
0x3 440
0x4 540
0x5 639
0x6 736
0x7 831
0x8 924
0x9 1012
0xA 1097
0xB 1178
0xC 1255
0xD 1329
0xE 1398
0xF 1462
7:3
2
Reserved
R/W
R/W
R/W
R/W
00000
Reserved
CLK_TX_FLIP
TX_SYNC_ENA
EXTREF_ENA
0
1
0
Flips the polarity of CLKTX
Syncs the CLKTX with SYSREF when asserted
1
0
Allows the chip to use an external refernce(1) or the internal
reference(0)
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8.5.72 DAC Fullscale Current Register (address = 0x0D) [reset = 0xF000]
Figure 124. DAC Fullscale Current Register (DACFS)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 119. DACFS Field Descriptions
Bit
Field
Type
R/W
R/W
Reset
Description
Scales the output current is 16 equal steps from 10-40mA
(10mA + 2mA*DACFS)
15:12
10:0
DACFS
Reserved
0xF
0x000
Reserved
8.5.73 Internal SYSREF Generator Register (address = 0x10) [reset = 0x0000]
Figure 125. Internal SYSREF Register (LCMGEN)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 120. LCMGEN Field Descriptions
Bit
15:4
3
Field
Type
R/W
R/W
R/W
R/W
R/W
Reset
Description
Reserved
0x00
Reserved
LCMGEN_ENA
0
0
0
0
Enables the LCM custom logic
Reset the LCM custom logic
TBD
2
LCMGEN_RESET
LCMGEN_SPI_SYSREF_ENA
LCM_SYSREF_OUTSEL
1
0
Chooses between internal and external SYSREF
8.5.74 Counter for Internal SYSREF Generator Register (address = 0x11) [reset = 0x0000]
Figure 126. Counter for Internal SYSREF Generator Register (LCMGEN_DIV)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 121. LCMGEN_DIV Field Descriptions
Bit
Field
Type
Reset
Description
Counter setting for the LCMGEN block
15:0
LCMGEN_DIV
R/W
0x00
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8.5.75 SPI SYSREF for Internal SYSREF Generator Register (address = 0x12) [reset = 0x0000]
Figure 127. SPI SYSREF for Internal SYSREF Generator Register (LCMGEN_SPISYSREF)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
0
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 122. LCMGEN_SPISYSREF Field Descriptions
Bit
15:1
0
Field
Type
R/W
R/W
Reset
0x00
0
Description
Reserved
Reserved
LCMGEN_SPI_SYSREF
SPI SYSREF for the LCMGEN block
8.5.76 Digital Test Signals Register (address = 0x1B) [reset = 0x0000]
Figure 128. Digital Test Signals Register (DTEST)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
0
4
1
3
1
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 123. DTEST Field Descriptions
Bit
Field
Type
Reset
Description
15
Reserved
R/W
0
Reserved
Selects the lane to check for the signals selected by field
DTEST
14:12
DTEST_LANE
R/W
000
Allows digital test signals to come out the ALARM pin.
0000 : Test disabled; normal ALARM pin function
0001 : SERDES lanes 0 – 3 PLL clock/80
0010 : SERDES lanes 4 – 7 PLL clock/80
0011 : TESTFAIL (lane selected by field DTEST_LANE)
0100 : SYNC (lane selected by field DTEST_LANE)
0101 : OCIP (lane selected by field DTEST_LANE)
0110 : EQUNDER (lane selected by field DTEST_LANE)
0111 : EQOVER (lane selected by field DTEST_LANE)
1000 – 1111 : not used
11:8
7:0
DTEST
R/W
R/W
0x0
Reserved
0x00
Reserved
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8.5.77 Sleep Pin Control Register (address = 0x23) [reset = 0xFFFF]
These fields control the routing of the SLEEP signal to different blocks. Assertion means that the SLEEP signal
will be sent to the block. These bits do not override the SPI bits; just the SLEEP signal from the PAD.
Figure 129. Sleep Pin Control Register (SLEEP_CNTL)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
0
3
0
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 124. SLEEP_CNTL Field Descriptions
Bit
Field
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
Description
15:10
Reserved
11111
Reserved
9
8
CLKOUT_SLEEP
BG_SLEEP
1
Allows the output clock to sleep
Allows the band gap to sleep
Allows the temp sensor to sleep
1
7
TEMP_SLEEP
PLL_CP_SLEEP
PLL_SLEEP
CLK_RECV_SLEEP
Reserved
1
6
1
Allows the PLL charge pump to sleep
Allows the PLL to sleep
Allows the clock receiver to sleep
Reserved
5
1
4
1
3:2
1
11
1
DACB_SLEEP
DACA_SLEEP
Allows DACB to sleep
0
1
Allows DACA to sleep
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8.5.78 SYSREF Capture Circuit Control Register (address = 0x24) [reset = 0x1000]
Figure 130. SYSREF Capture Circuit Control Register (SYSR_CAPTURE)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
1
5
0
4
0
3
0
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 125. SYSR_CAPTURE Field Descriptions
Bit
Field
Type
Reset
Description
sysref phase alignment tolerance window Centers sysref capture
window as follows:
00 = Centered on phase φ12 (**DEFAULT**)
01 = Centered on phase φ23
15:14
SYSR_PHASE_WDW
R/W
00
10 = Centered on phase φ34
11 = Centered on phase φ41
sysref alignment offset delay Optional alignment offset that
allows system designer to work around hardware (e.g. PCB)
alignment errors by letting him specify that the sysref pulse
should be treated as occurring one device clock earlier or later
than its observed position. Legal settings are as follows:
00 = Offset by -1 device clock cycles. Treat sysref as if it were
captured 1 cycle earlier.
13:12
SYSR_ALIGN_DLY
R/W
01
01 = No offset (**DEFAULT**)
10 = Offset by +1 device clock cycles. Treat sysref as if it were
captured 1 cycle later.
11 = Reserved
Enable alignment status monitoring Enable logic that generates
sysref alignment status information and accumulates statistics
that can be read by the user.
11
SYSR_STATUS_ENA
R/W
0
0 = Disable sysref alignment status outputs (**DEFAULT**).
Used during normal operation.
1 = Enable sysref alignment status outputs. Used when
characterizing sysref capture timing.
10:2
1
Reserved
R/W
R/W
0x000
0
Reserved
SYSR_ALIGN_SYNC
Write a ‘1’ to this bit to clear accumulated sysref align statistics
Bypass sysref alignment logic. Bypass the 4x oversampled
sysref alignment logic and instead capture the sysref signal
using the legacy implementation of a flip-flop clocked directly by
the rising edge of the device clock.
0
SYSR_BYPS_ALIGN
R/W
0
0 = Capture sysref using full-featured alignment circuit
(**DEFAULT**)
1 = Bypass sysref alignment logic
NOTE: When mem_sysref_bypass_align is enabled, the other
sysref alignment controls have no effect.
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8.5.79 Clock Input and PLL Configuration Register (address = 0x31) [reset = 0x0200]
Figure 131. Clock Input and PLL Configuration Register (CLK_PLL_CFG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 126. Clock Input and PLL Configuration Register (CLK_PLL_CFG)
Bit
Field
Type
Reset
Description
15:14
Reserved
R/W
00
Reserved
Selects the external differential or single ended clock for
DACCLK.
0 = differential
1 = single ended
13
SEL_EXTCLK_DIFFSE
R/W
0
12
11
PLL_RESET
R/W
R/W
0
0
When set the M divider; N divider and PFD are held reset
When asserted; the SYSREF input is used to sync the N
dividers of the PLL.
PLL_NDIVSYNC_ENA
Enables the PLL output as the DAC clock when set; the clock
provided at the DACCLKP/N is used as the PLL reference clock.
When cleared; the PLL is bypassed and the clock provided at
the DACCLKP/N pins is used as the DAC clock
10
9
PLL_ENA
R/W
0
1
Must be set to '0' for proper PLL operation.
1 = Charge pump is put to sleep and can be driven by external
source through the ATEST pins.
PLL_CP_SLEEP
R/W
8
Reserved
R/W
R/W
0
Reserved
7:3
PLL_N_M1
00000
Reference clock divider; divide by is N+1
Adjusts the lock detector sensitivity. Upper bit isn't used:
x00 - highest sensitivity x11 - lowest sensitivity
2:0
LOCKDET_ADJ
R/W
000
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8.5.80 PLL Configuration 1 Register (address = 0x32) [reset = 0x0308]
Figure 132. PLL Configuration 1 Register (PLL_CONFIG1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 127. CONFIG1 Field Descriptions
Bit
15:8
7:4
Field
Type
R/W
R/W
R/W
Reset
0x03
0x0
Description
PLL_M_M1
Reserved
VCO feedback divider; divide by is 4(M+1)
Reserved
3:0
PLL_VCO_RDAC
0x8
Controls the VCO amplitude
8.5.81 PLL Configuration 2 Register (address = 0x33) [reset = 0x4018]
Figure 133. PLL Configuration 2 Register (PLL_CONFIG2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
0
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 128. PLL_CONFIG2 Field Descriptions
Bit
Field
Type
Reset
Description
Selects between two VCOs
15
PLL_VCOSEL
R/W
0
0 = 5.9 GHz VCO(2 turn inductor in upper VCO)
1 = 8.9 GHz VCO (1 turn in the lower VCO)
14:8
7:6
PLL_VCO
Reserved
R/W
R/W
1000000
000
VCO frequency range
Reserved
Adjusts the charge pump current; 0 to 1.55 mA in 50 µA steps.
Setting to 0000 will hold the LPF pin at 0 V
5:2
PLL_CP_ADJ
R/W
0110
1
0
Reserved
Reserved
R/W
R/W
0
0
Reserved
Reserved. Always write 0
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8.5.82 LVDS Output Configuration Register (address = 0x34) [reset = 0x0000]
Figure 134. LVDS Output Configuration Register (LVDS_CONFIG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
0
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 129. LVDS_CONFIG Field Descriptions
Bit
Field
Type
Reset
Description
LVDS Output current control LSB; allows output current to be
scaled from ~2 mA to ~4 mA
15
LVDS_LOPWRB
R/W
0
LVDS Output current control MSB; allows output current to be
scaled from ~2 mA to ~4 mA
14
LVDS_LOPWRA
R/W
R/W
0
0
SYNC LVDS output on chip termination control; 100 Ω when
cleared; 200 Ω
Output current settings for the combination of bits 15:13
110 = 4.00 mA
010 = 3.50 mA
13
LVDS_LPSEL
100 = 3.00 mA
000 = 2.50 mA – Default current
111 = 4.00 mA
011 = 3.33 mA
101 = 2.66 mA
001 = 2.00 mA
Enable LVDS bias bandgap reference voltage to the ATEST
multiplexer.
12
LVDS_EFUSE_SEL
LVDS_TRIM
R/W
R/W
0
Adjusts the LVDS 1.2 V reference. LVDS_TRIM_ENA must be
set and LVDS_EFUSE_SEL must be cleared for these bits to
have any effect.
10 +70 mV
00 -70 mV
11:10
00
01 default
11 -20 mV.
When set and LVDS_EFUSE_SEL is cleared; the LVDS_TRIM
adjustment is enabled. When cleared; the LVDS_TRIM has no
effect.
9
LVDS_TRIM_ENA
R/W
0
8
7
LVDS_SYNC0\_PD
Reserved
R/W
R/W
0
0
The SYNC0 LVDS output is in power down.
Reserved
SYNC0 LVDS output common mode is 1.2 V when cleared; 0.9
V when set.
6
LVDS_SYNC0\_CM
Reserved
R/W
R/W
0
5:0
0x00
Reserved
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8.5.83 Fuse Farm clock divider Register (address = 0x35) [reset = 0x0018]
Figure 135. Fuse Farm clock divider Register (PLL_FDIV)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
0
1
1
0
1
R/W
R/W
R/1W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after rese1t
Table 130. PLL_FDIV Field Descriptions
Bit
15:8
7:0
Field
Type
R/W
R/W
Reset
0
Description
Reserved
PLL_FDIV
Reserved
0x18
Clock divider for the Fuse farm
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8.5.84 Serdes Clock Configuration Register (address = 0x3B) [reset = 0x0002]
Figure 136. Serdes Clock Configuration Register (SRDS_CLK_CFG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
0
1
1
0
1
R/W
R/W
R/1W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after rese1t
Table 131. SRDS_CLK_CFG Field Descriptions
Bit
Field
Type
Reset
Description
Select either the PLL output of the DACCLK from the pad.
15
SERDES_CLK_SEL
R/W
0
0 = DACCLK pad
1 = PLL output
14:11
10:2
SERDES_REFCLK_DIV
Reserved
R/W
R/W
0x0
The divide amount for the serdes REFCLK minus 1
Reserved
0x000
These bits select the pre-divide on the DACCLK input clock
before the DACCLK is used in the dividers used in the SERDES
PLL REFCLK and the Fusefarm SYSCLK.
00 = if DACCLK input ≤ 2 GHz; prediv is set to div1
01 = if DACCLK input is ≤ 4 GHz and > 2 GHz, prediv is set to
div2
1:0
SERDES_REFCLK_PREDIV
R/W
10
10 = if DACCLK input is ≤ 9 GHz and > 4 GHz, prediv is set to
div4
11 = Not valid
8.5.85 Serdes PLL Configuration Register (address = 0x3C) [reset = 0x8228]
Figure 137. Serdes PLL Configuration Register (SRDS_PLL_CFG)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 132. SRDS_PLL_CFG Field Descriptions
Bit
15
Field
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
Description
ENDIVCLK
CLKBYP
LB
1
Enable divided by 5 output clock
Serdes clock bypass
14:3
12:11
10
00
00
0
Serdes PLL loop bandwidth
Serdes PLL Sleep
SLEEPPLL
VRANGE
MPY
9
1
Serdes PLL loop filter range
8:1
0
00010100 Serdes reference clock multiplication factor Table 4
AND'ed with LANE_ENA so it must be set to 1 for correct
behavior
CORRECT
0
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8.5.86 Serdes Configuration 1 Register (address = 0x3D) [reset = 0x0x0088]
Figure 138. Serdes Configuration 1 Register (SRDS_CFG1)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
1
1
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 133. RDS_CFG1 Field Descriptions
Bit
15
Field
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
Description
Reserved
TESTPATT
BSINRXN
BSINRXP
Reserved
ENOC
Reserved
14:12
11
000
0
Test pattern
Enable boundary scan - pins
Enable boundary scan + pins
Reserved
10
0
9:8
7
00
1
Enable Serdes offset compensation
Equalizer hold
6
EQHLD
EQ
0
5:3
2:0
001
000
Serdes equalizer
CDR
Clock data recovery algorithm settings
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8.5.87 Serdes Configuration 2 Register (address = 0x3E) [reset = 0x0x0909]
Figure 139. Serdes Configuration 2 Register (SRDS_CFG2)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
1
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 134. SRDS_CFG2 Field Descriptions
Bit
Field
Type
Reset
Description
Enables loss of signal detection.
000 - Disable detection
100 - Enable detection
other - reserved
15:13
LOS
R/W
000
Enables external or internal symbol alignment
00 : Disabled
01 : Comma alignment
10: Align jog
12:11
10:8
ALIGN
TERM
R/W
R/W
01
Valid programming:
001 – AC coupling with common mode = 0.7 V
100 – 0 V common mode.
001
101 – 0.25 V common mode
111 – DC coupling with common mode of 0.6 V.
(NOTE: This is not compatible with JESD)
7
Reserved
RATE
R/W
R/W
0
Reserved
Selects full (00), half (01), quarter (10) or eighth (11) rate
operation.
6:5
00
Selects the parallel interface width (16 or 20 bits).
4:2
BUSWIDTH
R/W
010
0 : 20 bits
1: 16 bits
Powers the receiver down into the sleep (fast power up) state
when high.
1
0
SLEEPRX
Reserved
R/W
R/W
0
1
Reserved
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8.5.88 Serdes Polarity Control Register (address = 0x3F) [reset = 0x0000]
Figure 140. Serdes Polarity Control Register (SRDS_POL)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
1
1
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 135. SRDS_POL Field Descriptions
Bit
Field
Type
Reset
Description
15:8
Reserved
R/W
0x00
Reserved
Allows the PN pairs of the different lanes to be inverted.
bit 7 = lane7
bit 6 = lane6
bit 5 = lane5
bit 4 = lane4
bit 3 = lane3
bit 2 = lane2
bit 1 = lane1
bit 0 = lane0
7:0
INVPAIR
R/W
0x00
8.5.89 JESD204B SYNCB OUTPUT Register (address = 0x76) [reset = 0x0000]
Figure 141. JESD204B SYNCB OUTPUT Register (SYNCBOUT)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
x
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
0
6
0
5
1
4
1
3
1
2
0
1
1
0
1
R/W
R/W
R/1W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 136. SYNCBOUT Field Descriptions
Bit
Field
Type
Reset
Description
15:2
Reserved
R/W
0x00
Reserved
If the CMOS SYNC outputs are turned on, this bit will show the
status of the JESD SYNCB1 signal
1
0
SYNCBOUT1
SYNCBOUT0
R/W
R/W
0
0
If the CMOS SYNC outputs are turned on, this bit will show the
status of the JESD SYNCB0 signal
128
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9 Application and Implementation
注
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Start-up Sequence
PULL TXENABLE LOW
ñ
Provide all 1V supply rails, 1.8V rails and -1.8V rail.
ñ
ñ
ñ
Pull TRSTB pin of the JTAG port low
Provide a clock to the differential or single ended clock input
Toggle RESETB pin low then high (recommended pulse duration
>10us)
Read SPI Page 0, Register 0x7F
Bits[15:10] B 10000b
Bits[15:10]=10000b
Configure the SPI resgisters for the desired mode
Increment/decrement
VCO tune value
SPI Page 4, address
0x33, bits[14:8]
Read page 0, address 0x06
Tj = bits[15:8]
On chip PLL mode
YES
LFVOLT = bits[7:5]
NO
108/ G Çi < 125C, LFVOLT =5or6
Start SYSREF Generation
92/ G Çi < 108C, LFVOLT=4or5
26/ G Çi < 92C, LFVOLT =3or4
-40/ G Çi < 26C, LFVOLT =2or3
ñ
Reset encoder block:
Page 1/2:address 0x24:bits [6:4] = 000b
Page 1/2:address 0x5C:bits [2:0] = 000b
Page 4:address 0x0A:bit [15] = 1b
Ensure at least 2 SYSREF rising edges occur to reset the encoder
Page 4:address 0x0A:bit [15] = 0b
ñ
ñ
Put JESD204B core in reset
Page 0:address 0x00:bits [1:0] = 11b
Sync CDRV and JESD204B blocks
Page 1/2:address 0x24:bits [6:4] = 010b
Ensure at least 2 SYSREF rising edges occur to reset the CDRV
Page 1/2:address 0x5C:bits [2:0] = 011b
Ensure at least 2 SYSREF rising edges occur to reset the JESD
Take JESD Core out of reset
ñ
Page 0:address 0x00:bits [1:0] = 00b
Ensure at least 2 SYSREF rising edges occur
ñ
Clear all DAC alarms: Write 0x0000 to alarm registers on
Page0: 0x04, 0x05 and Page1/2: 0x64 to 0x6D
Stop SYSREF generation to DAC (optional)
Pull TXENABLE HIGH
Copyright © 2017, Texas Instruments Incorporated
图 142. DAC38RF82/89 Recommended Startup Sequence
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9.2 Typical Application
The block diagram of a typical DOCSIS downstream network is shown in 图 143. The physical layer (PHY) of the
cable modem termination system (or CMTS) must support normal downstream operating range from 54 MHz to
1002 MHz as well as extended operating range up to 1794 MHz. The high input bandwidth (up to 3.33 GHz) of
DAC38RF82 and DAC38RF89 makes these devices suitable for DOCSIS CMTS. Also the integrated high
performance PLL simplifies system clocking by eliminating the need to generate and distribute high frequency
sampling clock to the DAC. In the following sections, the performance of DAC38RF82 (and DAC38RF89) used to
generate DOCSIS 3.0, Annex A, 6 MHz 256-QAM carriers will be described.
CM
Hybrid fibre/coax
Network
Management
CMTS
HFC Network
Cable Modem Termination
System
CM
Cable modem
(Home Network)
图 143. DOCSIS Downstream Network
表 137. DOCSIS CMTS Design Features
9.2.1 Design Requirements
Feature
Frequency range
No of carriers
Channel width
Modulation type
Modulation rate
Data rate
Specification
54 MHz to 1002 MHz
1
6 MHz
256 QAM
5.3605 Msym/s
2.4576 GSPS
>48 dB
MER (unequalized)
ACPR
>70 dBc
9.2.2 Detailed Design Procedure
A sample rate of 4.9152 GHz is selected for the DAC. This will make it possible to meet the out of band (up to
3GHz) spurious requirement of 65 dBc by pushing the DAC images to the 2nd Nyquist zone (2.4576 MHz to
4.9152 GHz). Because the input data rate is 2.4576 GSPS, the DAC interpolation is set to 2. To generate the
4.9152 GHz sampling clock for the DAC, a low frequency 409.6 MHz clock is provided to the DAC reference
clock input. A detailed block diagram is shown in 图 144
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4915.2 MHz
409.6 MHz
SYSREF
Low Jitter
PLL
16 bit, real data
2.4576 GSPS
1.333 : 1
14-b
DAC
x
sin(x)
100Q
75Q
2x interp
图 144. DOCSIS Downstream Network
9.2.3 Calculating the JESD204B SerDes rate
SerDes rate = 1.25 x (M/L) x Baseband data rate x Number of bits per sample (16)
M is a JESD204B interface parameter that refers to the number of data streams from FPGA to DAC
L is a JESD204B interface parameter that refers to the number of SerDes lanes used to transmit data
1.25 is a factor due to the 8B10B encoding of the baseband data
Example,
if the baseband data rate = 2457.6 MSPS and L-M-F-S-Hd = 4-1-1-2-1
SerDes rate = 1.25 x (1/4) x 2457.6 x 16 = 12.288 Gbps
(19)
9.2.4 Calculating valid JESD204B SYSREF Frequency
Valid SYSREF frequencies depend on the following parameters:
1. Sample clock frequency
2. JESD204B internal clock divider value (CLKJESD_DIV). This depends on the DAC JESD204B L-M-F-S
mode and interpolation
3. Number of octets in a frame (F)
4. Number of frames in a multi-frame (K)
Maximum SYSREF frequency = (Sample clock frequency/N),
where N =LCM(CLKJESD_DIV,4 x K x F). N is the Least common multiple of 4 x K x F and CLKJESD_DIV.
All valid SYSREF frequencies are integer divisors of the maximum SYSREF frequency.
Example:
Given sampling clock frequency = 4.9152 GSPS, interpolation =2, DAC Mode=L-M-F-S=4-1-1-2 and K=20:
CLKJESD_DIV = 8 (CLKJESD_DIV)
Maximum SYSREF Frequency = 4915.2 MHz/80 = 61.44 MHz
Valid SYSREF Frequencies = 61.44 MHz/n, where n is any positive integer.
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9.2.5 Application Curves
图 145. ACPR Performance of 6 MHz Single Carrier at 591 MHz
图 146. ACPR performance of 6 MHz Single Carrier at 998 MHz
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图 147. Unequalized MER of 6 MHz Single Carrier at 591 MHz
图 148. Unequalized MER of 6 MHz Single Carrier at 998 MHz
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10 Power Supply Recommendations
Internally, DAC38RF82 (DAC38RF89) comprises a digital subsystem, an analog subsystem, and a clock
subsystem. Ideally, the power supply scheme should be partitioned according to these three relatively
independent blocks to minimize interactions between them. Most importantly, sensitive analog and clock circuit
power supply must be separated from digital switching noise to reduce direct coupling and mixing of switching
spurs. 表 138 shows the power supply rails for DAC38RF82 (DAC38RF89) grouped under their respective
domains.
表 138. Power Supply Domains
Supply rail
VDDIG1
Nominal voltage (V)
Domain
+1.0
+1.8
+1.8
+1.8
+1.0
+1.0
+1.0
-1.8
VDDIO18
VDDR18
VDDS18
Digital
VDDT1
VDDE1
VDDL1_1
VEE18N
VDDA1
+1.0
+1.8
+1.8
+1.0
+1.8
+1.8
+1.0
+1.0
+1.0
+1.8
Analog
VDDA18
VDDOUT18
VDDPLL1
VDDAPLL18
VDDAVCO18
VDDCLK1
VDDL2_1
VDDTX1
VDDTX18
Clock
An example power supply scheme suitable for most applications of DAC38RF82 (DAC38RF89) is shown in 图
149. It is recommended to use ferrite beads (FB) to isolate the individual rails from each other.
5Vin
1 V
TPS62085
(3 A)
VDDDIG1 (2.5 A)
1 V
VDDT1 (375 mA)
VDDL1_1 (45 mA)
VDDL2_1 (45 mA)
VDDCLK1 (425 mA)
VDDA1 (25 mA)
TPS74401
(2 A)
1 V
VDDPLL1 (30 mA)
VDDTX1 (14 mA)
VDDE1 (650 mA)
VDDA18 (45 mA)
1.8 V
TPS62085
(3 A)
VDDOUT18 (100 mA)
VDDAVCO18 (40 mA)
VDDAPLL18 (20 mA)
1.8 V
VDDR18 + VDDS18 + VDDIO18 (135 mA)
VDDTX18 (14 mA)
LM27761
(250 mA)
VEE18 (152 mA)
œ1.8 V
Copyright © 2017, Texas Instruments Incorporated
图 149. Power Supply Scheme for DAC38RF82 (DAC38RF89)
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10.1 Power Supply Sequencing
There are no power supply sequencing requirements for all the 1-V and 1.8-V power supplies. For the -1.8 V
VEE18 rail, it is recommended that this supply is the last to be enabled. Enabling VEE18 (while other supply
voltages are disabled) can cause a small negative voltage to be present at the other rails (that is, VDDA1 and
VDDDIG1). This small negative voltage can interfere with the startup of some DC-DC converters or LDO
connected to the 1 V and 1.8 V input power rails.
11 Layout
11.1 Layout Guidelines
•
DAC RF output traces
–
–
Differential 100 Ω co-planar wave guide for output traces is recommended.
Use short RF traces. Place DAC close to edge of PCB to shorten the length of output and clock traces.
This helps to minimize PCB loss and coupling
–
–
Stitch the ground plane with ground vias uniformly along the output trace.
Avoid width/spacing differences when entering a landing pad (eg. a balun) by tapering or by redefining
width/space rules for the traces
•
Power supply planes
–
Ensure sufficient lateral spacing between two power planes (about 3x the thickness of the plane is
recommended)
–
Insert ground plane between adjacent power planes where possible
图 150. Example Power Plane Routing
•
Bypass Capacitors
–
Use bypass capacitors with in-pad vias and place between the pin and the power plane. Avoid sharing
ground vias or pads of bypass caps used for different power rails
–
Minimize stubs on bypass capacitors to avoid parasitic inductance
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Layout Guidelines (接下页)
图 151. Bypass Capacitors Placed on the Power Supply Pin With In-pad Vias
High speed SerDes traces
•
–
–
Route all SerDes traces straight and minimized sharp curves or serpentines. Route for best signal integrity
Some skew between SerDes traces can be tolerated. It is recommended to limit skew between traces to
320ps or less
–
Place ground planes between the SerDes traces for improved isolation
图 152. Layout Example of High Speed SerDes Traces
136
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11.2 Layout Example
A
B
C
D
E
F
G
H
J
K
L
M
Rbias
12
11
10
9
Bottom Trace
Top Trace
Capacitor
Resistor
Via
8
7
6
5
4
3
2
1
图 153. Layout Example
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12 器件和文档支持
12.1 相关链接
下表列出了快速访问链接。类别包括技术文档、支持与社区资源、工具和软件,以及申请样片或购买产品的快速链
接。
表 139. 相关链接
器件
产品文件夹
单击此处
单击此处
立即订购
单击此处
单击此处
技术文档
单击此处
单击此处
工具和软件
单击此处
单击此处
支持和社区
单击此处
单击此处
DAC38RF82
DAC38RF89
12.2 接收文档更新通知
要接收文档更新通知,请导航至 ti.com.cn 上的器件产品文件夹。单击右上角的通知我进行注册,即可每周接收产
品信息更改摘要。有关更改的详细信息,请查看任何已修订文档中包含的修订历史记录。
12.3 支持资源
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do
not necessarily reflect TI's views; see TI's Terms of Use.
12.4 商标
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.5 静电放电警告
这些装置包含有限的内置 ESD 保护。 存储或装卸时,应将导线一起截短或将装置放置于导电泡棉中,以防止 MOS 门极遭受静电损
伤。
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 机械、封装和可订购信息
以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。数据如有变更,恕不另行通知,且
不会对此文档进行修订。如需获取此数据表的浏览器版本,请查阅左侧的导航栏。
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PACKAGE OPTION ADDENDUM
www.ti.com
19-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
DAC38RF82IAAV
DAC38RF82IAAVR
DAC38RF89IAAV
DAC38RF89IAAVR
ACTIVE
ACTIVE
ACTIVE
ACTIVE
FCCSP
FCCSP
FCCSP
FCCSP
AAV
AAV
AAV
AAV
144
144
144
144
168
RoHS & Green
SNAGCU
Level-3-260C-168 HR
Level-3-260C-168 HR
Level-3-260C-168 HR
Level-3-260C-168 HR
-40 to 85
-40 to 85
-40 to 85
-40 to 85
DAC38RF82I
Samples
Samples
Samples
Samples
1000 RoHS & Green
168 RoHS & Green
1000 RoHS & Green
SNAGCU
SNAGCU
SNAGCU
DAC38RF82I
DAC38RF89I
DAC38RF89I
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
19-Oct-2022
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Oct-2022
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
K0
P1
W
B0
Reel
Diameter
Cavity
A0
A0 Dimension designed to accommodate the component width
B0 Dimension designed to accommodate the component length
K0 Dimension designed to accommodate the component thickness
Overall width of the carrier tape
W
P1 Pitch between successive cavity centers
Reel Width (W1)
QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE
Sprocket Holes
Q1 Q2
Q3 Q4
Q1 Q2
Q3 Q4
User Direction of Feed
Pocket Quadrants
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
DAC38RF82IAAVR
DAC38RF89IAAVR
FCCSP
FCCSP
AAV
AAV
144
144
1000
1000
330.0
330.0
24.4
24.4
10.3
10.3
10.3
10.3
2.5
2.5
16.0
16.0
24.0
24.0
Q1
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Oct-2022
TAPE AND REEL BOX DIMENSIONS
Width (mm)
H
W
L
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
DAC38RF82IAAVR
DAC38RF89IAAVR
FCCSP
FCCSP
AAV
AAV
144
144
1000
1000
350.0
350.0
350.0
350.0
43.0
43.0
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Oct-2022
TRAY
L - Outer tray length without tabs
KO -
Outer
tray
height
W -
Outer
tray
width
Text
P1 - Tray unit pocket pitch
CW - Measurement for tray edge (Y direction) to corner pocket center
CL - Measurement for tray edge (X direction) to corner pocket center
Chamfer on Tray corner indicates Pin 1 orientation of packed units.
*All dimensions are nominal
Device
Package Package Pins SPQ Unit array
Max
matrix temperature
(°C)
L (mm)
W
K0
P1
CL
CW
Name
Type
(mm) (µm) (mm) (mm) (mm)
DAC38RF82IAAV
DAC38RF89IAAV
AAV
AAV
FCCSP
FCCSP
144
144
168
168
8 X 21
8 X 21
150
150
315 135.9 7620 14.65
315 135.9 7620 14.65
11
11
11.95
11.95
Pack Materials-Page 3
PACKAGE OUTLINE
AAV0144A
FCBGA - 1.91 mm max height
SCALE 1.400
BALL GRID ARRAY
10.15
9.85
A
B
BALL A1 CORNER
10.15
9.85
(
8)
(0.67)
1.91
1.70
(0.5)
C
SEATING PLANE
NOTE 4
BALL TYP
0.405
0.325
TYP
0.1 C
8.8 TYP
SYMM
(0.6) TYP
(0.6) TYP
0.8 TYP
M
L
K
J
H
G
F
SYMM
8.8
TYP
E
D
C
B
A
0.51
0.41
144X
0.15
0.08
C A B
NOTE 3
C
1
2
3
4
5
6
7
8
9
10
11
12
0.8 TYP
4219578/C 05/2022
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Dimension is measured at the maximum solder ball diameter, parallel to primary datum C.
4. Primary datum C and seating plane are defined by the spherical crowns of the solder balls.
www.ti.com
EXAMPLE BOARD LAYOUT
AAV0144A
FCBGA - 1.91 mm max height
BALL GRID ARRAY
(0.8) TYP
1
3
5
6
7
8
9
10 11
4
12
2
A
B
(0.8) TYP
C
D
E
F
144X ( 0.4)
SYMM
G
H
J
K
L
M
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:8X
(
0.4)
0.05 MAX
METAL UNDER
SOLDER MASK
0.05 MIN
METAL
EXPOSED
METAL
EXPOSED
METAL
(
0.4)
SOLDER MASK
OPENING
SOLDER MASK
OPENING
NON-SOLDER MASK
DEFINED
SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
NOT TO SCALE
4219578/C 05/2022
NOTES: (continued)
5. Final dimensions may vary due to manufacturing tolerance considerations and also routing constraints.
For more information, see Texas Instruments literature number SPRU811 (www.ti.com/lit/spru811).
www.ti.com
EXAMPLE STENCIL DESIGN
AAV0144A
FCBGA - 1.91 mm max height
BALL GRID ARRAY
(0.8) TYP
144X ( 0.4)
10 11
1
3
5
6
7
8
9
4
12
2
A
B
(0.8) TYP
C
D
E
F
SYMM
G
H
J
K
L
M
SYMM
SOLDER PASTE EXAMPLE
BASED ON 0.15 mm THICK STENCIL
SCALE:8X
4219578/C 05/2022
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release.
www.ti.com
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