ADS5517IRGZTG4 [TI]
11-BIT, 200 MSPS ADC; 11位， 200 MSPS ADC
| 型号： | ADS5517IRGZTG4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 11-BIT, 200 MSPS ADC |
| 文件： | 总54页 (文件大小：1606K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ADS5517
www.ti.com
SLWS203–DECEMBER 2007
11-BIT, 200 MSPS ADC
1
FEATURES
•
•
•
•
Clock Duty Cycle Stabilizer
•
Maximum Sample Rate: 200 MSPS
No External Reference Decoupling Required
Internal and External Reference Support
•
•
•
•
•
•
•
•
11-Bit Resolution
No Missing Codes
Programmable Output Clock Position to Ease
Data Capture
Total Power Dissipation 1.23 W
Internal Sample and Hold
•
•
3.3-V Analog and Digital Supply
48-QFN Package (7 mm × 7 mm)
67-dBFS SNR at 70-MHz IF
84-dBc SFDR at 70-MHz IF, 0-dB Gain
High Analog Bandwidth up to 800 MHz
APPLICATIONS
•
•
•
•
•
•
•
•
Wireless Communications Infrastructure
Software Defined Radio
Power Amplifier Linearization
802.16d/e
Test and Measurement Instrumentation
High Definition Video
Double Data Rate (DDR) LVDS and Parallel
CMOS Output Options
•
Programmable Gain up to 6 dB for SNR/SFDR
Trade-Off at High IF
•
•
Reduced Power Modes at Lower Sample Rates
Supports Input Clock Amplitude Down to
400 mVPP
Medical Imaging
Radar Systems
In a compact 48-pin QFN, the device offers fully
differential LVDS DDR (Double Data Rate) interface
while parallel CMOS outputs can also be selected.
Flexible output clock position programmability is
available to ease capture and trade-off setup for hold
times. At lower sampling rates, the ADC can be
operated at scaled down power with no loss in
performance. The ADS5517 includes an internal
reference, while eliminating the traditional reference
pins and associated external decoupling. The device
also supports an external reference mode.
DESCRIPTION
ADS5517 is a high performance 11-bit, 200-MSPS
A/D converter. It offers state-of-the art functionality
and performance using advanced techniques to
minimize board space. With high analog bandwidth
and low jitter input clock buffer, the ADC supports
both high SNR and high SFDR at high input
frequencies. It features programmable gain options
that can be used to improve SFDR performance at
lower full-scale analog input ranges.
The device is specified over the industrial
temperature range (-40°C to 85°C).
ADS5517 PRODUCT FAMILY
210 MSPS
ADS5547
ADS5527
190 MSPS
ADS5546
-
170 MSPS
ADS5545
ADS5525
14 bit
12 bit
ADS5517
(200MSPS)
11 bit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
ADS5517
www.ti.com
SLWS203–DECEMBER 2007
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
CLKP
CLKOUTP
CLKOUTM
CLOCKGEN
CLKM
LOW_D0_P
LOW_D0_M
D1_D2_P
D1_D2_M
D3_D4_P
D3_D4_M
Digital
Encoder
and
INP
INM
11-Bit
ADC
D5_D6_P
D5_D6_M
SHA
Serializer
D7_D8_P
D7_D8_M
D9_D10_P
D9_D10_M
Control
Interface
VCM
Reference
OVR
LVDS MODE
PACKAGE/ORDERING INFORMATION(1)
SPECIFIED
TEMPERATURE
RANGE
TRANSPORT
MEDIA,
QUANTITY
PACKAGE-
PACKAGE
DESIGNATOR
PACKAGE
MARKING
ORDERING
NUMBER
PRODUCT
LEAD
Tape and Reel,
250
ADS5517IRGZT
ADS5517IRGZR
ADS5517
QFN-48(2)
RGZ
–40°C to 85°C
AZ5517
Tape and Reel,
2500
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) For thermal pad size on the package, see the mechanical drawings at the end of this data sheet. θJA = 25.41°C/W (0 LFM air flow),
θJC = 16.5°C/W when used with 2 oz. copper trace and pad soldered directly to a JEDEC standard four layer 3 in x 3 in (7.62 cm x 7.62
cm) PCB.
2
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SLWS203–DECEMBER 2007
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
VALUE
UNIT
Supply voltage range, AVDD
–0.3 to 3.9
–0.3 to 3.9
-0.3 to 0.3
-0.3 to 3.3
-0.3 to 1.8
V
V
V
V
V
Supply voltage range, DRVDD
Voltage between AGND and DRGND
Voltage between AVDD to DRVDD
Voltage applied to VCM pin (in external reference mode)
Voltage applied to analog input pins, INP and INM
Voltage applied to input clock pins, CLKP and CLKM
–0.3 to minimum (3.6, AVDD + 0.3)
V
-0.3 to AVDD + 0.3
–40 to 85
V
TA
Operating free-air temperature range
Operating junction temperature range
Storage temperature range
°C
°C
°C
TJ
125
Tstg
–65 to 150
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
MIN
TYP
MAX
UNIT
SUPPLIES
Analog supply voltage, AVDD
Digital supply voltage, DRVDD
ANALOG INPUTS
3
3
3.3
3.3
3.6
3.6
V
V
Differential input voltage range
2
1.5 ±0.1
1.5
VPP
V
Input common-mode voltage
Voltage applied on VCM in external reference mode
1.45
1.55
V
CLOCK INPUT
Input clock sample rate
(1)
MSPS
MSPS
DEFAULT SPEED mode
LOW SPEED mode
50
1
200
60
Input clock amplitude differential (V(CLKP) - V(CLKM)
)
Sine wave, ac-coupled
0.4
1.5
1.6
VPP
VPP
VPP
V
LVPECL, ac-coupled
LVDS, ac-coupled
0.7
LVCMOS, single-ended, ac-coupled
Input clock duty cycle (See Figure 25)
3.3
35%
50%
65%
DIGITAL OUTPUTS
CL
Maximum external load capacitance from each output pin to DRGND (LVDS and CMOS modes)
Without internal termination (default after reset)
5
10
pF
pF
Ω
(2)
With 100 Ω internal termination
RL
Differential load resistance between the LVDS output pairs (LVDS mode)
100
Operating free-air temperature
–40
85
°C
(1) See the section on Low Sampling Frequency Operation for more information.
(2) See the section on LVDS Buffer Internal termination for more information.
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ELECTRICAL CHARACTERISTICS
Typical values are at 25°C, min and max values are across the full temperature range TMIN = –40°C to TMAX = 85°C,
AVDD = DRVDD = 3.3 V, sampling rate = 200 MSPS, sine wave input clock, 1.5 VPP differential clock amplitude, 50% clock
duty cycle, –1 dBFS differential analog input, internal reference mode, 0-db gain, DDR LVDS data output (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Resolution
11
bits
ANALOG INPUT
Differential input voltage range
Differential input capacitance
Analog input bandwidth
2
7
VPP
pF
800
MHz
Analog input common mode current
(per input pin)
342
µA
REFERENCE VOLTAGES
V(REFB)
V(REFT)
ΔV(REF)
VCM
Internal reference bottom voltage
Internal reference top voltage
Internal reference error
Internal reference mode
0.5
2.5
±25
1.5
±4
V
V
Internal reference mode
V(REFT) - V(REFB)
-60
60
mV
V
Common mode output voltage
VCM output current capability
Internal reference mode
Internal reference mode
mA
DC ACCURACY
No Missing Codes
Specified
±0.3
±0.6
5
DNL
INL
Differential non-linearity
Integral non-linearity
Offset error
-0.6
-1.5
-10
1.0
1.5
10
LSB
LSB
mV
Offset temperature coefficient
0.002
±1
ppm/°C
%FS
Gain error due to internal reference
error alone
(ΔV(REF) / 2.0V)%
-3
-2
3
2
Gain error excluding internal reference
error(1)
± 1
%FS
Gain temperature coefficient
0.01
0.6
Δ%/°C
PSRR
DC Power supply rejection ratio
mV/V
POWER SUPPLY
I(AVDD)
I(DRVDD)
ICC
Analog supply current
306
66
mA
mA
LVDS mode, IO = 3.5 mA,
RL = 100 Ω, CL = 5 pF
Digital supply current
CMOS mode, FIN = 2.5 MHz,
CL = 5 pF
47
mA
Total supply current
Total power dissipation
Standby power
LVDS mode
372
1.23
100
100
mA
W
LVDS mode
1.4
150
150
In STANDBY mode with clock stopped
With input clock stopped
mW
mW
Clock stop power
(1) Gain error is specified from design and characterization; it is not tested in production.
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SLWS203–DECEMBER 2007
ELECTRICAL CHARACTERISTICS
Typical values are at 25°C, min and max values are across the full temperature range TMIN = –40°C to TMAX = 85°C,
AVDD = DRVDD = 3.3 V, sampling rate = 200 MSPS, sine wave input clock, 1.5 VPP differential clock amplitude, 50% clock
duty cycle, –1 dBFS differential analog input, internal reference mode, 0-db gain, DDR LVDS data output (unless otherwise
noted)
PARAMETER
AC CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
67.1
66.9
66.8
66.6
66
64.5
SNR
Signal to noise ratio
dBFS
0 dB gain, 2 VPP FS(1)
FIN = 230 MHz
FIN = 400 MHz
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
65.4
65
64.5
86
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
75
84
78
79
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
75
SFDR
Spurious free dynamic range
FIN = 230 MHz
FIN = 300 MHz
FIN = 400 MHz
dBc
dBFS
dBc
78
74
76
68
70
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
67
64
66.8
66.6
66.4
65
SINAD Signal to noise and distortion ratio
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
FIN = 230 MHz
FIN = 400 MHz
65
62.8
62.9
91
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
75
88
87
87
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
86
HD2
Second harmonic
FIN = 230 MHz
FIN = 300 MHz
FIN = 400 MHz
88
78
80
69
71
(1) FS = Full scale range
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ELECTRICAL CHARACTERISTICS (continued)
Typical values are at 25°C, min and max values are across the full temperature range TMIN = –40°C to TMAX = 85°C,
AVDD = DRVDD = 3.3 V, sampling rate = 200 MSPS, sine wave input clock, 1.5 VPP differential clock amplitude, 50% clock
duty cycle, –1 dBFS differential analog input, internal reference mode, 0-db gain, DDR LVDS data output (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
86
84
78
79
75
78
74
76
68
70
95
92
92
90
90
88
87
83
82
76
77
73
72
65
10.8
91
MAX
UNIT
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
75
0 dB gain, 2 VPP FS
HD3
Third harmonic
FIN = 230 MHz
FIN = 300 MHz
FIN = 400 MHz
dBc
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
0 dB gain, 2 VPP FS
3 dB gain, 1.4 VPP FS
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
FIN = 230 MHz
FIN = 300 MHz
FIN = 400 MHz
FIN = 20 MHz
FIN = 70 MHz
FIN = 100 MHz
FIN = 170 MHz
FIN = 230 MHz
FIN = 300 MHz
FIN = 400 MHz
FIN = 70 MHz
Worst harmonic (other than HD2, HD3)
dBc
73
THD
Total harmonic distortion
dBc
ENOB
IMD
Effective number of bits
10.3
bits
dBFS
dBc
FIN1 = 50.03 MHz, FIN2 = 46.03 MHz,
-7 dBFS each tone
Two-tone intermodulation distortion
FIN1 = 190.1 MHz, FIN2 = 185.02 MHz,
-7 dBFS each tone
86
35
1
PSRR
AC power supply rejection ratio
Voltage overload recovery time
30 MHz, 200 mVPP signal on 3.3-V supply
Recovery to 1% (of final value) for 6-dB overload
with sine-wave input at Nyquist frequency
Clock
cycles
6
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DIGITAL CHARACTERISTICS(1)
The DC specifications refer to the condition where the digital outputs are not switching, but are permanently at a valid logic
(2)
level 0 or 1 AVDD = DRVDD = 3.3 V, IO = 3.5 mA, RL = 100 Ω
PARAMETER
DIGITAL INPUTS
TEST CONDITIONS
MIN
TYP
MAX UNIT
High-level input voltage
Low-level input voltage
High-level input current
Low-level input current
Input capacitance
2.4
V
0.8
V
33
–33
4
µA
µA
pF
DIGITAL OUTPUTS – CMOS MODE
High-level output voltage
Low-level output voltage
Output capacitance
3.3
0
V
V
Output capacitance inside the device, from each output to
ground
2
pF
DIGITAL OUTPUTS – LVDS MODE
High-level output voltage
1375
1025
350
mV
mV
mV
mV
Low-level output voltage
Output differential voltage, |VOD
|
225
425
VOS Output offset voltage, single-ended Common-mode voltage of OUTP and OUTM
1200
Output capacitance inside the device, from either output to
Output capacitance
ground
2
pF
(1) All LVDS and CMOS specifications are characterized, but not tested at production.
(2) IO refers to the LVDS buffer current setting, RL is the differential load resistance between the LVDS output pair.
TIMING CHARACTERISTICS – LVDS AND CMOS MODES(1)
Typical values are at 25°C, min and max values are across the full temperature range TMIN = –40°C to TMAX = 85°C, AVDD =
DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP clock amplitude, CL = 5 pF(2), IO = 3.5 mA,
RL = 100 Ω (3), no internal termination, unless otherwise noted.
For timings at lower sampling frequencies, see the Output Timing section in the APPLICATION INFORMATION of this data
sheet.
PARAMETER
Aperture delay
TEST CONDITIONS
MIN
TYP
1.2
MAX
UNIT
ns
ta
tj
Aperture jitter
150
fs rms
Time to valid data after coming out of
STANDBY mode
100
100
Wake-up time
µs
Time to valid data after stopping and
restarting the input clock
clock
cycles
Latency
14
DDR LVDS MODE(4)
tsu
Data setup time(5)
Data valid (6) to zero-cross of CLKOUTP
1.0
1.5
0.8
ns
ns
Zero-cross of CLKOUTP to data becoming
invalid(6)
th
Data hold time(5)
0.35
(1) Timing parameters are specified by design and characterization and not tested in production.
(2) CL is the effective external single-ended load capacitance between each output pin and ground.
(3) IO refers to the LVDS buffer current setting; RL is the differential load resistance between the LVDS output pair.
(4) Measurements are done with a transmission line of 100 Ω characteristic impedance between the device and the load.
(5) Setup and hold time specifications take into account the effect of jitter on the output data and clock. These specifications also assume
that the data and clock paths are perfectly matched within the receiver. Any mismatch in these paths within the receiver would appear
as reduced timing margin.
(6) Data valid refers to logic high of +50 mV and logic low of –50 mV.
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TIMING CHARACTERISTICS – LVDS AND CMOS MODES (continued)
For timings at lower sampling frequencies, see the Output Timing section in the APPLICATION INFORMATION of this data
sheet.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input clock rising edge zero-cross to output
clock rising edge zero-cross
tPDI
Clock propagation delay(7)
3.7
4.4
5.1
ns
Duty cycle of differential clock,
(CLKOUTP-CLKOUTM)
80 ≤ Fs ≤ 200 MSPS
LVDS bit clock duty cycle
45%
50
50%
100
55%
200
Rise time measured from –50 mV to 50
mV
Fall time measured from 50 mV to –50 mV
1 ≤ Fs ≤ 200 MSPS
tr ,
tf
Data rise time,
Data fall time
ps
ps
Rise time measured from –50 mV to 50
mV
Fall time measured from 50 mV to –50 mV
1 ≤ Fs ≤ 200 MSPS
tCLKRISE
,
Output clock rise time,
50
100
120
200
1
tCLKFALL Output clock fall time
Output clock jitter
Cycle-to-cycle jitter
ps pp
Output enable (OE) to valid data
delay
Time to valid data after OE becomes
active
tOE
µs
PARALLEL CMOS MODE
Data valid(8) to 50% of CLKOUT rising
edge
ns
(5)
tsu
th
Data setup time
1.8
0.4
2.6
2.6
0.8
50% of CLKOUT rising edge to data
becoming invalid(8)
(5)
Data hold time
ns
ns
Input clock rising edge zero-cross to 50%
of CLKOUT rising edge
tPDI
Clock propagation delay(7)
Output clock duty cycle
3.4
4.2
2.0
Duty cycle of output clock (CLKOUT)
80 ≤ Fs ≤ 200 MSPS
45%
Rise time measured from 20% to 80% of
DRVDD
Fall time measured from 80% to 20% of
DRVDD
tr ,
tf
Data rise time,
Data fall time
0.8
0.4
1.5
0.8
ns
1 ≤ Fs ≤ 200 MSPS
Rise time measured from 20% to 80% of
DRVDD
Fall time measured from 80% to 20% of
DRVDD
tCLKRISE
,
Output clock rise time,
tCLKFALL Output clock fall time
1.2
50
ns
ns
1 ≤ Fs ≤ 200 MSPS
Output enable (OE) to valid data
delay
Time to valid data after OE becomes
active
tOE
(7) To use the input clock as the data capture clock, it is necessary to delay the input clock by a delay (tD) to get the desired setup and hold
times. Use either of these equations to calculate tD:
Desired setup time = tD - (tPDI - tsu
Desired hold time = (tPDI + th ) - tD
)
(8) Data valid refers to logic high of 2 V and logic low of 0.8 V
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N+17
N+16
N+4
N+3
N+15
N+2
Sample
N
N+1
N+14
Input
Signal
ta
CLKP
Input
Clock
CLKM
CLKOUTM
CLKOUTP
tsu
th
tPDI
14 Clock Cycles
DDR
LVDS
Output Data
DXP, DXM
O
E
O
E
O
E
O
E
O
E
O
E
O
E
O
E
O
E
O
E
E – Even Bits D0,D2,D4,D6,D8,D10
O – Odd Bits D1,D3,D5,D7,D9
N–14
N–13
N–12
N–11
N–10
N–1
N
N+1
N+2
tPDI
CLKOUT
tsu
Parallel
CMOS
14 Clock Cycles
th
Output Data
D0–D10
N–14
N–13
N–12
N–11
N–10
N–1
N
N+1
N+2
Figure 1. Latency
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CLKM
CLKP
Input
Clock
tPDI
CLKOUTP
CLKOUTM
Output
Clock
th
tsu
tsu
th
Dn(Note A)
Dn+1(Note B)
Output
Data Pair
Dn_Dn+1_P,
Dn_Dn+1_M
A. Dn – Bits D1, D3, D5, D7, and D9
B. Dn+1 – Bits D0, D2, D4, D6, D8, and D10
Figure 2. LVDS Mode Timing
CLKM
Input
Clock
CLKP
tPDI
Output
Clock
CLKOUT
th
tsu
Dn(Note A)
Output
Data
Dn
A. Dn – Bits D0–D10
Figure 3. CMOS Mode Timing
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DEVICE PROGRAMMING MODES
ADS5517 offers flexibility with several programmable features that are easily configured.
The device can be configured independently using either parallel interface control or serial interface
programming.
In addition, the device supports a third configuration mode, where both the parallel interface and the serial control
registers are used. In this mode, the priority between the parallel and serial interfaces is determined by a priority
table (Table 2). If this additional level of flexibility is not required, the user can select either the serial interface
programming or the parallel interface control.
USING PARALLEL INTERFACE CONTROL ONLY
To control the device using parallel interface, keep RESET tied to high (DRVDD). Pins DFS, MODE, SEN,
SCLK, and SDATA are used to directly control certain modes of the ADC. The device is configured by
connecting the parallel pins to the correct voltage levels (as described in Table 3 to Table 7). There is no need to
apply reset.
In this mode, SEN, SCLK, and SDATA function as parallel interface control pins. Frequently used functions are
controlled in this mode—standby, selection between LVDS/CMOS output format, internal/external reference,
two's complement/straight binary output format, and position of the output clock edge.
Table 1 has a description of the modes controlled by the parallel pins.
Table 1. Parallel Pin Definition
PIN
DFS
CONTROL MODES
DATA FORMAT and the LVDS/CMOS output interface
MODE
SEN
Internal or external reference
CLKOUT edge programmability
SCLK
SDATA
LOW SPEED mode control for low sampling frequencies (< 50 MSPS)
STANDBY mode – Global (ADC, internal references and output buffers are powered down)
USING SERIAL INTERFACE PROGRAMMING ONLY
To program using the serial interface, the internal registers must first be reset to their default values, and the
RESET pin must be kept low. In this mode, SEN, SDATA, and SCLK function as serial interface pins and are
used to access the internal registers of ADC. The registers are reset either by applying a pulse on the RESET
pin, or by a high setting on the <RST> bit (D1 in register 0x6C). The serial interface section describes the
register programming and register reset in more detail.
Since the parallel pins DFS and MODE are not used in this mode, they must be tied to ground.
USING BOTH THE SERIAL INTERFACE AND PARALLEL CONTROLS
For increased flexibility, a combination of serial interface registers and parallel pin controls (DFS, MODE) can
also be used to configure the device.
The serial registers must first be reset to their default values and the RESET pin must be kept low. In this mode,
SEN, SDATA, and SCLK function as serial interface pins and are used to access the internal registers of ADC.
The registers are reset either by applying a pulse on RESET pin or by a high setting on the <RST> bit (D1 in
register 0x6C). The serial interface section describes the register programming and register reset in more detail.
The parallel interface control pins DFS and MODE are used and their function is determined by the appropriate
voltage levels as described in Table 6 and Table 7. The voltage levels are derived by using a resistor string as
illustrated in Figure 4. Since some functions are controlled using both the parallel pins and serial registers, the
priority between the two is determined by a priority table (Table 2).
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Table 2. Priority Between Parallel Pins and Serial Registers
PIN
FUNCTIONS SUPPORTED
PRIORITY
When using the serial interface, bit <REF> (register 0x6D, bit D4) controls this mode, ONLY
if the MODE pin is tied low.
MODE
Internal/External reference
DATA FORMAT
When using the serial interface, bit <DF> (register 0x63, bit D3) controls this mode, ONLY if
the DFS pin is tied low.
DFS
When using the serial interface, bit <ODI> (register 0x6C, bits D3-D4) controls LVDS/CMOS
selection independent of the state of DFS pin
LVDS/CMOS
AVDD
(2/3) AVDD
R
(2/3) AVDD
(1/3) AVDD
GND
AVDD
R
R
(1/3) AVDD
To Parallel Pin
Figure 4. Simple Scheme to Configure Parallel Pins
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DESCRIPTION OF PARALLEL PINS
Table 3. SCLK Control Pin
SCLK (Pin 29)
DESCRIPTION
0
LOW SPEED mode Disabled - Use for sampling frequencies above 50 MSPS.
LOW SPEED mode Enabled - Use for sampling frequencies below 50 MSPS.
DRVDD
Table 4. SDATA Control Pin
SDATA (Pin 28)
DESCRIPTION
0
Normal operation (Default)
DRVDD
STANDBY. This is a global power down, where ADC, internal references and the output buffers are powered down.
Table 5. SEN Control Pin
SEN (Pin 27)
0
DESCRIPTION
CMOS mode: CLKOUT edge later by (3/12)Ts (1); LVDS mode: CLKOUT edge aligned with data transition
CMOS mode: CLKOUT edge later by (2/12)Ts ; LVDS mode: CLKOUT edge aligned with data transition
CMOS mode: CLKOUT edge later by (1/12)Ts ; LVDS mode: CLKOUT edge earlier by (1/12)Ts
Default CLKOUT position
(1/3)DRVDD
(2/3)DRVDD
DRVDD
(1) Ts = 1/Sampling Frequency
Table 6. DFS Control Pin
DFS (Pin 6)
DESCRIPTION
0
2's complement data and DDR LVDS output (Default)
2's complement data and parallel CMOS output
(1/3)DRVDD
(2/3)DRVDD
DRVDD
Offset binary data and parallel CMOS output
Offset binary data and DDR LVDS output
Table 7. MODE Control Pin
MODE (Pin 23)
0
DESCRIPTION
Internal reference
External reference
External reference
Internal reference
(1/3)AVDD
(2/3)AVDD
AVDD
SERIAL INTERFACE
The ADC has a set of internal registers, which can be accessed through the serial interface formed by pins SEN
(Serial interface Enable), SCLK (Serial Interface Clock), SDATA (Serial Interface Data) and RESET. After device
power-up, the internal registers must be reset to their default values by applying a high-going pulse on RESET
(of width greater than 10 ns).
Serial shift of bits into the device is enabled when SEN is low. Serial data SDATA is latched at every falling edge
of SCLK when SEN is active (low). The serial data is loaded into the register at every 16th SCLK falling edge
when SEN is low. If the word length exceeds a multiple of 16 bits, the excess bits are ignored. Data is loaded in
multiples of 16-bit words within a single active SEN pulse.
The first 8 bits form the register address and the remaining 8 bits form the register data. The interface can work
with SCLK frequency from 20 MHz down to very low speeds (few Hertz) and also with non-50% SCLK duty
cycle.
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REGISTER INITIALIZATION
After power-up, the internal registers must be reset to their default values. This is done in one of two ways:
1. Either through hardware reset by applying a high-going pulse on RESET pin (of width greater than 10 ns) as
shown in Figure 5.
OR
2. By applying software reset. Using the serial interface, set the <RST> bit (D1 in register 0x6C) to high. This
initializes the internal registers to their default values and then self-resets the <RST> bit to low. In this case
the RESET pin is kept low.
Register Address
Register Data
SDATA
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
t(DH)
D1
D0
t(SCLK)
t(DSU)
SCLK
t(SLOADH)
t(SLOADS)
SEN
RESET
Figure 5. Serial Interface Timing Diagram
SERIAL INTERFACE TIMING CHARACTERISTICS
Typical values at 25°C, min and max values across the full temperature range TMIN = –40°C to TMAX = 85°C,
AVDD = DRVDD = 3.3 V (unless otherwise noted)
MIN
TYP
MAX
20
UNIT
MHz
ns
fSCLK
tSLOADS
tSLOADH
tDSU
SCLK frequency
> DC
SEN to SCLK setup time
SCLK to SEN hold time
SDATA setup time
SDATA hold time
25
25
25
25
ns
ns
tDH
ns
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RESET TIMING
Typical values at 25°C, min and max values across the full temperature range TMIN = –40°C to TMAX = 85°C,
AVDD = DRVDD = 3.3 V (unless otherwise noted)
PARAMETER
Power-on delay
Reset pulse width
Register write delay
Power-up time
TEST CONDITIONS
MIN
5
TYP
MAX
UNIT
ms
ns
t1
Delay from power-up of AVDD and DRVDD to RESET pulse active
Pulse width of active RESET signal
t2
10
25
t3
Delay from RESET disable to SEN active
ns
tPO
Delay from power-up of AVDD and DRVDD to output stable
6.5
ms
Power Supply
AVDD, DRVDD
t1
RESET
t2
t3
SEN
NOTE: A high-going pulse on RESET pin is required in serial interface mode in case of initialization through hardware reset.
For parallel interface operation, RESET has to be tied permanently HIGH.
Figure 6. Reset Timing Diagram
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SERIAL REGISTER MAP
Table 8 gives a summary of all the modes that can be programmed through the serial interface.
(1)(2)
Table 8. Summary of Functions Supported by Serial Interface
REGISTER
ADDRESS
IN HEX
REGISTER FUNCTIONS
D4 D3
A7 – A0
D7
D6
D5
D2
D1
D0
<DATA POSN>
OUTPUT DATA
POSITION
<CLKOUT POSN>
OUTPUT CLOCK POSITION PROGRAMMABILITY
62
PROGRAMMABILITY
<LOW SPEED>
ENABLE LOW
SAMPLING
FREQUENCY
OPERATION
<DF>
DATA FORMAT -
2's COMP or
STRAIGHT
BINARY
<STBY>
GLOBAL
POWER
DOWN
63
65
<TEST PATTERN> – ALL 0S, ALL 1s,
TOGGLE, RAMP, CUSTOM PATTERN
68
69
6A
6B
<GAIN> GAIN PROGRAMMING <GAIN> - 1 dB to 6 dB
<CUSTOM A> CUSTOM PATTERN (D7 TO D0)
<CUSTOM B> CUSTOM PATTERN (D13 TO D8)
<CLKIN GAIN> INPUT CLOCK BUFFER GAIN PROGRAMMABILITY
<RST>
<ODI> OUTPUT DATA INTERFACE
SOFTWARE
6C
- DDR LVDS or PARALLEL CMOS
RESET
<REF>
INTERNAL or
EXTERNAL
REFERENCE
6D
<SCALING> POWER SCALING
<DATA TERM>
INTERNAL TERMINATION – DATA
OUTPUTS
<LVDS CURR>
LVDS CURRENT
PROGRAMMABILITY
<CLKOUT TERM>
INTERNAL TERMINATION – OUTPUT CLOCK
7E
7F
<CURR DOUBLE>
LVDS CURRENT
DOUBLE
(1) The unused bits in each register (shown by blank cells in above table) must be programmed as ‘0’.
(2) Multiple functions in a register can be programmed in a single write operation.
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DESCRIPTION OF SERIAL REGISTERS
Each register function is explained in detail below.
Table 9. Serial Register A
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
<DATA POSN>
OUTPUT DATA
POSITION
<CLKOUT POSN>
OUTPUT CLOCK POSITION PROGRAMMABILITY
62
PROGRAMMABILITY
D4 — D0
<CLKOUT POSN> Output clock position programmability
00001
Default CLKOUT position after reset. Setup/hold timings with this clock
position are specified in the timing characteristics table.
XX011
XX101
XX111
01XX1
10XX1
11XX1
CMOS – Falling edge later by (1/12) Ts
LVDS – Falling edge earlier by (1/12) Ts
CMOS – Falling edge later by (3/12) Ts
LVDS – Falling edge aligned with data transition
CMOS – Falling edge later by (2/12) Ts
LVDS – Falling edge aligned with data transition
CMOS – Rising edge later by (1/12) Ts
LVDS – Rising edge earlier by (1/12) Ts
CMOS – Rising edge later by (3/12) Ts
LVDS – Rising edge aligned with data transition
CMOS – Rising edge later by (2/12) Ts
LVDS – Rising edge aligned with data transition
D6 — D5
<DATA POSN> Output Switching Noise and Data Position
Programmability (in CMOS mode ONLY) (Only in CMOS mode)
00
Data Position 1 – Default output data position after reset. Setup/hold
timings with this data position are specified in the timing characteristics
table.
01
10
11
Data Position 2 – Setup time increases by (2/36) Ts
Data Position 3 – Setup time increases by (5/36) Ts
Data Position 4 – Setup time decreases by (6/36) Ts
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Table 10. Serial Register B
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
<DF>
DATA
FORMAT
2's COMP or
STRAIGHT
BINARY
<LOW SPEED>
ENABLE LOW
SAMPLING
FREQUENCY
OPERATION
<STBY>
GLOBAL
POWER
DOWN
63
D3
0
<DF> Output data format
2's complement
1
Straight binary
D4
0
<LOW SPEED> Low sampling frequency operation
Default SPEED mode for 50 < Fs ≤ 200 MSPS
Low SPEED mode 1≤ Fs ≤ 50 MSPS
1
D7
0
<STBY> Global power down
Normal operation
1
Global power down (includes ADC, internal references and output buffers)
Table 11. Serial Register C
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
<TEST PATTERNS> — ALL 0S, ALL 1s,
TOGGLE, RAMP, CUSTOM PATTERN
65
D7 — D5
000
<TEST PATTERN> Outputs selected test pattern on data lines
Normal operation
All 0s
001
010
All 1s
011
Toggle pattern – alternate 1s and 0s on each data output and across
data outputs
100
101
111
Ramp pattern – Output data ramps from 0x0000 to 0x3FFF by one
code every clock cycle
Custom pattern – Outputs the custom pattern in CUSTOM PATTERN
registers A and B
Unused
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Table 12. Serial Register D
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
68
<GAIN> GAIN PROGRAMMING <GAIN> - 1 dB to 6 dB
D3 — D0
1000
<GAIN> Gain programmability
0 dB gain, default after reset
1001
1 dB
2 dB
3 dB
4 dB
5 dB
6 dB
1010
1011
1100
1101
1110
Table 13. Serial Register E
A7 – A0 (hex)
D7
D6
<CUSTOM A> CUSTOM PATTERN (D4 TO D0)
<CUSTOM B> CUSTOM PATTERN (D10 TO D5)
D5
D4
D3
D2
D1
D0
69
6A
Reg 69
Reg 6A
D7 — D3
D5 — D0
Program bits D4 to D0 of custom pattern
Program bits D10 to D5 of custom pattern
Table 14. Serial Register F
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
6B
<CLKIN GAIN> INPUT CLOCK BUFFER GAIN PROGRAMMABILITY
D5 - D0
110010
101010
100110
100000
100011
<CLKIN GAIN> Input clock buffer gain programming
Gain 4, maximum gain
Gain 3
Gain 2
Gain1, default after reset
Gain 0 minimum gain
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Table 15. Serial Register G
A7 – A0 (hex)
D7
D6
D5
D4
D3
D2
D1
D0
<ODI> OUTPUT DATA
INTERFACE - DDR LVDS OR
PARALLEL CMOS
<RST>
SOFTWARE
RESET
6C
D1
<RST> Software resets the ADC
1
Resets all registers to default values
D4 — D3
<ODI> Output data interface
DDR LVDS outputs, default after reset
DDR LVDS outputs
00
01
11
Parallel CMOS outputs
Table 16. Serial Register H
A7 – A0
D7
D6
D5
D4
D3
D2
D1
D0
<REF> INTERNAL or
EXTERNAL REFERENCE
6D
<SCALING> POWER SCALING
D4
0
<REF> Reference
Internal reference
1
External reference mode, force voltage on Vcm to set reference.
D7 — D5
<SCALING> Program power scaling at lower sampling
frequencies
001
011
101
111
Use for Fs > 150 MSPS, default after reset
Power Mode 1, use for 105 < Fs ≤ 150 MSPS
Power Mode 2, use for 50 < Fs ≤ 105
Power Mode 3, use for Fs ≤ 50 MSPS
Table 17. Serial Register I
A7 – A0
D7
D6
D5
D4
D3
D2
D1
D0
<LVDS CURR> LVDS
CURRENT
PROGRAMMABILITY
<DATA TERM> INTERNAL TERMINATION –
<CLKOUT TERM> INTERNAL
TERMINATION – OUTPUT CLOCK
7E
DATA OUTPUTS
D1 — D0
<LVDS CURR> LVDS buffer current programming
00
01
10
11
3.5 mA, default
2.5 mA
4.5 mA
1.75 mA
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D4 — D2
<CLKOUT TERM> LVDS internal termination for output
clock pin (CLKOUT)
000
001
010
011
100
101
110
111
No internal termination
325 Ω
200 Ω
125 Ω
170 Ω
120 Ω
100 Ω
75 Ω
D7 — D5
<DATA TERM> LVDS internal termination for output data
pins
000
001
010
011
100
101
110
111
No internal termination
325 Ω
200 Ω
125 Ω
170 Ω
120 Ω
100 Ω
75 Ω
Table 18. Serial Register J
A7 – A0
D7
D6
D5
D4
D3
D2
D1
D0
<CURR DOUBLE> LVDS
CURRENT DOUBLE
7F
D7 — D6
<CURR DOUBLE> LVDS buffer current double
Value specified by <LVDS CURR>
2x data, 2x clockout currents
00
01
10
11
1x data, 2x clockout currents
2x data, 4x clockout currents
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PIN CONFIGURATION (LVDS MODE)
RGZ PACKAGE
(TOP VIEW)
1
36
35
34
33
32
31
30
29
28
27
26
25
DRGND
DRVDD
OVR
DRGND
DRVDD
NC
2
Thermal Pad
3
4
CLKOUTM
CLKOUTP
DFS
NC
5
NC
6
NC
7
OE
RESET
SCLK
SDATA
SEN
8
AVDD
9
AGND
CLKP
10
11
12
CLKM
AVDD
AGND
AGND
Figure 7. LVDS Mode Pinout
PIN ASSIGNMENTS – LVDS Mode
PIN
TYPE
PIN
NUMBER
NUMBER
OF PINS
PIN NAME
DESCRIPTION
8, 18, 20,
22, 24, 26
AVDD
AGND
Analog power supply
I
6
6
9, 12, 14,
17, 19, 25
Analog ground
I
CLKP, CLKM
INP, INM
Differential clock input
I
I
10, 11
15, 16
2
2
Differential analog input
Internal reference mode – Common-mode voltage output.
External reference mode – Reference input. The voltage forced on this pin sets
the internal references.
VCM
IREF
I/O
I
13
21
1
1
Current-set resistor, 56.2-kΩ resistor to ground.
Serial interface RESET input.
When using the serial interface mode, the user MUST initialize internal registers
through hardware RESET by applying a high-going pulse on this pin, or by using
the software reset option. See the SERIAL INTERFACE section.
In parallel interface mode, the user has to tie the RESET pin permanently HIGH.
(SDATA and SEN are used as parallel pin controls in this mode)
The pin has an internal 100-kΩ pull-down resistor.
RESET
I
30
1
22
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PIN ASSIGNMENTS – LVDS Mode (continued)
PIN
TYPE
PIN
NUMBER
NUMBER
OF PINS
PIN NAME
DESCRIPTION
This pin functions as serial interface clock input when RESET is low.
It functions as LOW SPEED control pin when RESET is tied high. Tie SCLK to
LOW for Fs > 50 MSPS and SCLK to HIGH for Fs ≤ 50 MSPS. See Table 3.
The pin has an internal 100-kΩ pull-down resistor.
SCLK
I
I
I
29
28
27
1
1
1
This pin functions as serial interface data input when RESET is low. It functions as
STANDBY control pin when RESET is tied high.
SDATA
SEN
See Table 4 for detailed information.
The pin has an internal 100 kΩ pull-down resistor.
This pin functions as serial interface enable input when RESET is low. It functions
as CLKOUT edge programmability when RESET is tied high. See Table 5 for
detailed information.
The pin has an internal 100-kΩ pull-up resistor to DRVDD.
Output buffer enable input, active high. The pin has an internal 100-kΩ pull-up
resistor to DRVDD.
OE
I
I
I
7
6
1
1
1
Data Format Select input. This pin sets the DATA FORMAT (Twos complement or
Offset binary) and the LVDS/CMOS output mode type. See Table 6 for detailed
information.
DFS
MODE
Mode select input. This pin selects the Internal or External reference mode. See
Table 7 for detailed information.
23
CLKOUTP
CLKOUTM
LOW_D0_P
LOW_D0_M
D1_D2_P
D1_D2_M
D3_D4_P
D3_D4_M
D5_D6_P
D5_D6_M
D7_D8_P
D7_D8_M
D9_D10_P
D9_D10_M
OVR
Differential output clock, true
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
5
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
Differential output clock, complement
Differential output data LOW and D0 multiplexed, true
Differential output data LOW and D0 multiplexed, complement
Differential output data D1 and D2 multiplexed, true
Differential output data D1 and D2 multiplexed, complement
Differential output data D3 and D4 multiplexed, true
Differential output data D3 and D4 multiplexed, complement
Differential output data D5 and D6 multiplexed, true
Differential output data D5 and D6 multiplexed, complement
Differential output data D7 and D8 multiplexed, true
Differential output data D7 and D8 multiplexed, complement
Differential output data D9 and D10 multiplexed, true
Differential output data D9 and D10 multiplexed, complement
Out-of-range indicator, CMOS level signal
38
37
40
39
42
41
44
43
46
45
48
47
3
DRVDD
Digital and output buffer supply
2, 35
1, 36
DRGND
Digital and output buffer ground
I
31, 32, 33,
34
NC
Do not connect
4
1
Connect the pad to the ground plane. See Board Design Considerations in
application information section.
PAD
0
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PIN CONFIGURATION (CMOS MODE)
RGZ PACKAGE
(TOP VIEW)
1
36
35
34
33
32
31
30
29
28
27
26
25
DRGND
DRVDD
OVR
DRGND
DRVDD
NC
2
Thermal Pad
3
4
UNUSED
CLKOUT
DFS
NC
5
NC
6
NC
7
OE
RESET
SCLK
SDATA
SEN
8
AVDD
AGND
CLKP
9
10
11
12
CLKM
AGND
AVDD
AGND
Figure 8. CMOS Mode Pinout
PIN ASSIGNMENTS – CMOS Mode
PIN
TYPE
PIN
NUMBER
NUMBER
OF PINS
PIN NAME
DESCRIPTION
8, 18, 20,
22, 24, 26
AVDD
AGND
Analog power supply
Analog ground
I
6
6
9, 12, 14, 17,
19, 25
I
CLKP, CLKM Differential clock input
I
I
10, 11
15, 16
2
2
INP, INM
Differential analog input
Internal reference mode – Common-mode voltage output.
External reference mode – Reference input. The voltage forced on this pin sets the
internal references.
VCM
I/O
I
13
21
1
1
IREF
Current-set resistor, 56.2-kΩ resistor to ground.
Serial interface RESET input.
When using the serial interface mode, the user MUST initialize internal registers
through hardware RESET by applying a high-going pulse on this pin, or by using
the software reset option. See the SERIAL INTERFACE section.
RESET
SCLK
I
I
30
29
1
1
In parallel interface mode, the user has to tie RESET pin permanently HIGH.
(SDATA and SEN are used as parallel pin controls in this mode).
The pin has an internal 100-kΩ pull-down resistor.
This pin functions as serial interface clock input when RESET is low.
It functions as LOW SPEED control pin when RESET is tied high. Tie SCLK to
LOW for Fs > 50 MSPS and SCLK to HIGH for Fs ≤ 50 MSPS. See Table 3.
The pin has an internal 100-kΩ pull-down resistor.
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PIN ASSIGNMENTS – CMOS Mode (continued)
PIN
TYPE
PIN
NUMBER
NUMBER
OF PINS
PIN NAME
DESCRIPTION
This pin functions as serial interface data input when RESET is low. It functions as
STANDBY control pin when RESET is tied high.
SDATA
SEN
I
I
28
27
1
1
See Table 4 for detailed information.
The pin has an internal 100 kΩ pull-down resistor.
This pin functions as serial interface enable input when RESET is low. It functions
as CLKOUT edge programmability when RESET is tied high. See Table 5 for
detailed information.
The pin has an internal 100-kΩ pull-up resistor to DRVDD.
Output buffer enable input, active high. The pin has an internal 100-kΩ pull-up
resistor to DRVDD.
OE
I
I
I
7
6
1
1
1
Data Format Select input. This pin sets the DATA FORMAT (Twos complement or
Offset binary) and the LVDS/CMOS output mode type. See Table 6 for detailed
information.
DFS
MODE
Mode select input. This pin selects the internal or external reference mode. See
Table 7 for detailed information.
23
CLKOUT
D0
CMOS output clock
O
O
O
O
O
O
O
O
O
O
O
O
O
I
5
38
39
40
41
42
43
44
45
46
47
48
3
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
CMOS output data D0 (LSB)
CMOS output data D1
D1
D2
CMOS output data D2
D3
CMOS output data D3
D4
CMOS output data D4
D4
CMOS output data D5
D6
CMOS output data D6
D7
CMOS output data D7
D8
CMOS output data D8
D9
CMOS output data D9
D10
CMOS output data D10 (MSB)
Out-of-range indicator, CMOS level signal
Digital and output buffer supply
Digital and output buffer ground
Unused pin in CMOS mode
OVR
DRVDD
DRGND
UNUSED
2, 35
1, 36
4
I
31, 32, 33,
34, 37
NC
Do not connect
5
1
Connect the pad to the ground plane. See Board Design Considerations in
application information section.
PAD
0
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TYPICAL CHARACTERISTICS
All plots are at 25°C, AVDD = DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, DDR LVDS data
output (unless otherwise noted)
FFT for 20 MHz INPUT SIGNAL
SFDR = 86.68 dBc,
FFT for 70 MHz INPUT SIGNAL
SFDR = 89.4 dBc,
SNR = 66.91 dBFS,
SINAD = 66.84 dBFS
THD = 84.11 dBc
0
-20
-40
0
-20
-40
SNR = 67.27 dBFS,
SINAD = 67.19 dBFS
THD = 83.31 dBc
-60
-80
-60
-80
-100
-100
-120
-140
-120
-140
0
0
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
f - Frequency - MHz
f - Frequency - MHz
Figure 9.
Figure 10.
FFT for 130 MHz INPUT SIGNAL
FFT for 270 MHz INPUT SIGNAL
0
-20
-40
0
-20
-40
SFDR = 82.5 dBc,
SNR = 66.82 dBFS,
SINAD = 66.69 dBFS
THD = 81.18 dBc
SFDR = 74.46 dBc,
SNR = 66.09 dBFS,
SINAD = 65.13 dBFS
THD = 71.17 dBc
-60
-80
-60
-80
-100
-100
-120
-140
-120
-140
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
f - Frequency - MHz
f - Frequency - MHz
Figure 11.
Figure 12.
FFT for 430 MHz INPUT SIGNAL
INTERMODULATION DISTORTION (IMD) vs FREQUENCY
0
-20
-40
0
SFDR = 66.56 dBc,
SNR = 65.04 dBFS,
SINAD = 62.77 dBFS
THD = 65.61 dBc
fIN1 = 185.3 MHz, -7 dBFS,
-20
fIN2 = 190.1 MHz, -7 dBFS,
SFDR = 98 dBFS,
2-Tone IMD, 87 dBFS
-40
-60
-60
-80
-80
-100
-100
-120
-140
-120
-140
20 30 40 50 60 70 80 90 100
10 20 30 40 50 60 70 80 90 100
0
10
f - Frequency - MHz
f - Frequency - MHz
Figure 13.
Figure 14.
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TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, AVDD = DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, DDR LVDS data
output (unless otherwise noted)
SFDR vs INPUT FREQUENCY
SNR vs INPUT FREQUENCY
69
68
67
66
65
64
63
90
86
82
78
74
70
66
62
62
61
0
50 100 150 200 250 300 350 400 450 500
fIN − Input Frequency − MHz
Figure 16.
0
50 100 150 200 250 300 350 400 450 500
f
- Input Frequency - MHz
IN
Figure 15.
SFDR vs GAIN
SNR vs GAIN
68
96
92
1 dB
3 dB
0 dB
1 dB
5 dB
2 dB
4 dB
2 dB 3 dB
67
66
65
64
88
84
80
76
6 dB
0 dB
72
68
64
5 dB
4 dB
6 dB
0
0
50 100 150 200 250 300 350 400 450
50 100 150 200 250 300 350 400 450 500
fIN − Input Frequency − MHz
Figure 17.
fIN − Input Frequency − MHz
Figure 18.
PERFORMANCE vs AVDD
PERFORMANCE vs DRVDD
70
86
70
87
86
85
SFDR
SFDR
84
82
69
69
FIN = 50.1 MHz
68
fIN = 50.1 MHz
68
DRVDD = 3.3 V
AVDD = 3.3 V
SNR
SNR
80
78
67
67
84
83
66
66
3
3.1
3.2
AV
3.3
3.4
3.5
3.6
3.0
3.1
3.2
3.3
3.4
3.5
3.6
- Supply Voltage - V
DRVDD − Supply Voltage − V
DD
Figure 19.
Figure 20.
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TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, AVDD = DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, DDR LVDS data
output (unless otherwise noted)
SNR vs SAMPLING FREQUENCY
PERFORMANCE vs TEMPERATURE
fIN = 50.1 MHz
(Across Power Scaling Modes)
90
88
70
69
69
68
67
66
65
64
63
Default
Power Mode 1
SFDR
Power Mode 2
68
86
SNR
84
82
67
66
62
61
60
Power Mode 3
−40
−15
10
35
50
85
TA − Free-Air Temperature − oC
40
60
80
100 120 140 160 180 200
FS − Sampling Frequency − MSPS
Figure 21.
Figure 22.
PERFORMANCE vs INPUT AMPLITUDE
PERFORMANCE vs CLOCK AMPLITUDE
105
95
85
75
65
55
45
35
25
71
86
71
70
69
fIN = 50.1 MHz
70
69
68
SFDR
85
84
SFDR (dBc)
f
= 20.1 MHz
IN
Sine Wave Input Clock
67
66
65
64
63
SNR (dBFS)
68
83
82
81
67
66
SNR
−40
−30
−20
−10
0
0.3 0.5 0.8 1.1 1.3 1.5 1.8 2.1 2.3 2.5 2.8
Clock Amplitude - V
PP
Input Amplitude − dBFS
Figure 23.
Figure 24.
OUTPUT NOISE HISTOGRAM WITH
INPUTS TIED TO COMMON-MODE
PERFORMANCE vs INPUT CLOCK DUTY CYCLE
71
87
86
110
100
90
fIN = 20.1 MHz
70
69
68
67
66
80
SFDR
70
60
50
40
30
85
84
SNR
83
82
20
10
0
35
40
45
50
55
60
65
Input Clock Duty Cycle − %
Output Code
Figure 25.
Figure 26.
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TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, AVDD = DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, DDR LVDS data
output (unless otherwise noted)
PERFORMANCE IN EXTERNAL REFERENCE MODE
71
COMMON-MODE REJECTION RATIO vs FREQUENCY
-35
87
86
SFDR
-40
70
69
68
67
66
-45
-50
-55
-60
85
fIN = 20 MHz
84
83
SNR
-65
-70
82
1.4
1.45
1.5
1.55
1.6
0
20
40
60
80
100
Voltage Forced on the CM Pin − V
f - Frequency of AC Common-Mode Voltage - MHz
Figure 27.
Figure 28.
POWER DISSIPATION vs
SAMPLING FREQUENCY
DIGITAL CURRENT vs
SAMPLING FREQUENCY (Parallel CMOS)
1.24
1.18
1.12
100
90
CMOS
10-pF Load Cap
LVDS Mode
80
Default
70
60
50
40
30
20
10
0
1.06
1.00
0.94
0.88
0.82
0.76
DDR LVDS
Power Mode 1
Power Mode 2
CMOS
0-pF Load Cap
CMOS
5-pF Load Cap
0.70
0.64
Power Mode 3
0
20 40 60 80 100 120 140 160 180 200
f − Frequency − MSPS
0
20 40 60 80 100 120 140 160 180 200
FS − Sampling Frequency − MSPS
Figure 29.
Figure 30.
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TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, AVDD = DRVDD = 3.3 V, sampling frequency = 200 MSPS, sine wave input clock, 1.5 VPP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain, DDR LVDS data
output (unless otherwise noted)
200
65.5
180
66.5
160
140
64.5
65.5
120
66.5
100
80
64.5
65.5
63.5
66.5
60
40
66.5
50
62.5
400
61.5
64.5
63.5
65.5
10
100
150
200
250
300
350
450
500
f
- Input Frequency - MHz
IN
60
61
62
63
64
65
66
67
SNR - dBFS
Figure 31. SNR Contour in dBFS
200
180
160
140
120
100
82
82
78
82
82
74
66
70
62
86
58
86
78
82
74
86
70
66
62
58
82
86
80
60
40
78
86
62
66
74
70
54
82
100
10
50
150
200
250
300
350
400
450
500
f
- Input Frequency - MHz
IN
50
55
60
65
70
80
85
90
75
SFDR - dBc
Figure 32. SFDR Contour in dBc
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APPLICATION INFORMATION
THEORY OF OPERATION
ADS5517 is a low power 11-bit 200 MSPS pipeline ADC in a CMOS process. ADS5517 is based on switched
capacitor technology and runs off a single 3.3-V supply. The conversion process is initiated by a rising edge of
the external input clock. Once the signal is captured by the input sample and hold, the input sample is
sequentially converted by a series of lower resolution stages, with the outputs combined in a digital correction
logic block. At every clock edge, the sample propagates through the pipeline resulting in a data latency of 14
clock cycles. The output is available as 11-bit data, in DDR LVDS or CMOS and coded in either straight offset
binary or binary 2’s complement format.
ANALOG INPUT
The analog input consists of a switched-capacitor based differential sample and hold architecture, shown in
Figure 33.
This differential topology results in good ac-performance even for high input frequencies at high sampling rates.
The INP and INM pins have to be externally biased around a common-mode voltage of 1.5 V available on VCM
pin 13. For a full-scale differential input, each input pin INP, INM has to swing symmetrically between VCM +
0.5 V and VCM – 0.5 V, resulting in a 2-VPP differential input swing. The maximum swing is determined by the
internal reference voltages REFP (2.5 V nominal) and REFM (0.5 V, nominal).
Sampling
Switch
Lpkg
6 nH
Sampling
Capacitor
R-C-R Filter
INP
Ron
15 W
10 W
Csamp
2.4 pF
Cbond
2 pF
Cpar2
1 pF
50 W
1.6 pF
50 W
Resr
200 W
Ron
10 W
Cpar1
0.8 pF
Lpkg
6 nH
Csamp
2.4 pF
Ron
15 W
10 W
INM
Sampling
Capacitor
Cbond
2 pF
Cpar2
1 pF
Resr
200 W
Sampling
Switch
Figure 33. Input Stage
The input sampling circuit has a high 3-dB bandwidth that extends up to 800 MHz (measured from the input pins
to the voltage across the sampling capacitors)
Drive Circuit Requirements
The input sampling circuit of the ADS5517 has a high 3-dB analog bandwidth of 800 MHz making it possible to
sample input signals up to very high frequencies. To get best performance, it is recommended to have an
external R-C-R filter across the input pins (Figure 34). This helps to filter the glitches due to the switching of the
sampling capacitors. The R-C-R filter has to be designed to provide adequate filtering (for good performance)
and at the same time ensure sufficient bandwidth over the desired frequency range.
In addition, it is recommended to have a 15-Ω series resistor on each input line to damp out ringing caused by
the package parasitic. At higher input frequencies (> 100 MHz), a lower series resistance around 5 Ω to 10 Ω
should be used. It is also necessary to present low impedance (< 50 Ω) for the common-mode switching
currents. For example, this could be achieved by using two resistors from each input terminated to the
common-mode voltage (Vcm).
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Using 10-Ω series resistance and 25 Ω-3.3 pF-25 Ω as the R-C-R filter, high effective bandwidth (700 MHz) can
be achieved, (see Figure 35, transfer function from the analog input pins to the voltage across the sampling
capacitors).
In addition to the above ADC requirements, the drive circuit may have to be designed to provide a low insertion
loss over the desired frequency range and matched impedance to the source. For this, the ADC input impedance
has to be taken into account (Figure 36).
Example Drive Circuits
A suitable configuration using RF transformers and including the R-C-R filter is shown in Figure 34. Note the
15-Ω series resistors and the low common-mode impedance (using 33-Ω resistors terminated to VCM).
Z and TFADC
i
15 W
(Note A)
WBC1-1TLB
WBC1-1TLB
0.1 mF
INP
100 W
100 W
25 W
3.3 pF
25 W
33 W
33 W
0.1 mF
INM
15 W
(Note A)
1:1
1:1
VCM
A. Use lower series resistance (≈ 5 Ω to 10 Ω) at high input frequencies (> 100 MHz)
Figure 34. Example Drive Circuit With RF Transformers
2
500
450
1
0
400
350
300
250
200
150
100
-1
-2
-3
-4
-5
-6
50
0
0
100
200 300 400
500 600 700
800 900 1000
0
100
200 300 400
500 600 700
800 900 1000
f − Frequency − MHz
f − Frequency − MHz
Figure 35. Analog Input Bandwidth, TFADC (Actual
Silicon Data)
Figure 36. Input Impedance, ZI
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Using RF transformers
For optimum performance, the analog inputs have to be driven differentially. This improves the common-mode
noise immunity and even order harmonic rejection. The single-ended signal is fed to the primary winding of the
RF transformer. The transformer is terminated on the secondary side. Putting the termination on the secondary
side helps to shield the kickbacks caused by the sampling circuit from the RF transformer’s leakage inductances.
The termination is accomplished by two resistors connected in series, with the center point connected to the 1.5
V common-mode (VCM pin 13).
At higher input frequencies, the mismatch in the transformer parasitic capacitance (between the windings) results
in degraded even-order harmonic performance. Connecting two identical RF transformers back to back helps
minimize this mismatch and good performance is obtained for high frequency input signals. An additional
termination resistor pair (Figure 34) may be required between the two transformers to improve the balance
between the P and M sides. The center point of this termination must be connected to ground. (Note that the
drive circuit has to be tuned to account for this additional termination, to get the desired S11 and impedance
match).
Using Differential Amplifier Drive Circuits
Figure 37 shows a drive circuit using a differential amplifier (TI's THS4509) to convert a single-ended input to
differential output that can be interface to the ADC analog input pins. In addition to the single-ended to differential
conversion, the amplifier also provides gain (10 dB in Figure 37). RFIL helps to isolate the amplifier outputs from
the switching input of the ADC. Together with CFIL, it forms a low-pass filter that band-limits the noise (and signal)
at the ADC input. As the amplifier output is ac-coupled, the common-mode voltage of the ADC input pins is set
using two 200 Ω resistors connected to VCM.
The amplifier output can also be dc-coupled. Using the output common-mode control of the THS4509, the ADC
input pins can be biased to 1.5 V. In this case, use +4 V and -1 V supplies for the THS4509 so that its output
common-mode voltage (1.5 V) is at mid-supply.
RF
+VS
0.1 mF
RFIL
500 W
5 W
0.1 mF 10 mF
0.1 mF
INP
RS
RG
CFIL
200 W
0.1 mF
RT
CM THS4509
RG
200 W
5 W
CFIL
RFIL
INM
0.1 mF
500 W
RS || RT
VCM ADS5517
0.1 mF
–VS
0.1 mF 10 mF
0.1 mF
RF
Figure 37. Drive Circuit Using the THS4509
See the EVM User Guide (SLWU028) for more information.
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Input Common-Mode
To ensure a low-noise common-mode reference, the VCM pin is filtered with a 0.1-µF low-inductance capacitor
connected to ground. The VCM pin is designed to directly drive the ADC inputs. The input stage of the ADC
sinks a common-mode current in the order of 342 µA (at 200 MSPS). Equation 1 describes the dependency of
the common-mode current and the sampling frequency.
(342 mA) x Fs
200 MSPS
(1)
This equation helps to design the output capability and impedance of the CM driving circuit accordingly.
Reference
ADS5517 has built-in internal references REFP and REFM, requiring no external components. Design schemes
are used to linearize the converter load seen by the references; this and the integration of the requisite reference
capacitors on-chip eliminates the need for external decoupling. The full-scale input range of the converter can be
controlled in the external reference mode as explained below. The internal or external reference modes can be
selected by controlling the MODE pin 23 (see Table 7 for details) or by programming the serial interface register
bit <REF> (Table 16).
INTREF
Internal
Reference
VCM
INTREF
EXTREF
REFM
REFP
Figure 38. Reference Section
Internal Reference
When the device is in internal reference mode, the REFP and REFM voltages are generated internally.
Common-mode voltage (1.5 V nominal) is output on VCM pin, which can be used to externally bias the analog
input pins.
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External Reference
When the device is in external reference mode, the VCM acts as a reference input pin. The voltage forced on the
VCM pin is buffered and gained by 1.33 internally, generating the REFP and REFM voltages. The differential
input voltage corresponding to full-scale is given by Equation 2.
Full−scale differential input pp + (Voltage forced on VCM) 1.33
(2)
In this mode, the 1.5 V common-mode voltage to bias the input pins has to be generated externally. There is no
change in performance compared to internal reference mode.
Low Sampling Frequency Operation
For best performance at high sampling frequencies, ADS5517 uses a clock generator circuit to derive internal
timing for the ADC. The clock generator operates from 200 MSPS down to 50 MSPS in the DEFAULT SPEED
mode. The ADC enters this mode after applying reset (with serial interface configuration) or by tying SCLK pin to
low (with parallel configuration).
For low sampling frequencies (below 50 MSPS), the ADC must be put in the LOW SPEED mode. This mode can
be entered by:
•
•
setting the register bit <LOW SPEED> through the serial interface, OR
tying the SCLK pin to high (see Table 3) using the parallel configuration.
Clock Input
ADS5517 clock inputs can be driven differentially (SINE, LVPECL or LVDS) or single-ended (LVCMOS), with
little or no difference in performance between configurations. The common-mode voltage of the clock inputs is
set to VCM using internal 5-kΩ resistors as shown in Figure 39. This allows the use of transformer-coupled drive
circuits for sine wave clock, or ac-coupling for LVPECL, LVDS clock sources (Figure 40 and Figure 41)
VCM
VCM
5 kW
5 kW
CLKP
CLKM
Figure 39. Internal Clock Buffer
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For best performance, it is recommended to drive the clock inputs differentially, reducing susceptibility to
common-mode noise. In this case, it is best to connect both clock inputs to the differential input clock signal with
0.1-µF capacitors, as shown in Figure 40.
0.1 mF
CLKP
Differential Sine-Wave
or PECL or LVDS
Clock Input
0.1 mF
CLKM
Figure 40. Differential Clock Driving Circuit
A single-ended CMOS clock can be ac-coupled to the CLKP input, with CLKM (pin 11) connected to ground with
a 0.1-µF capacitor, as shown in Figure 41.
0.1 mF
CMOS Clock Input
CLKP
0.1 mF
CLKM
Figure 41. Single-Ended Clock Driving Circuit
For best performance, the clock inputs have to be driven differentially, reducing susceptibility to common-mode
noise. For high input frequency sampling, the use a clock source with low jitter is recommended. Bandpass
filtering of the clock source can help reduce the effect of jitter. There is no change in performance with a
non-50% duty cycle clock input. Figure 25 shows the performance variation of the ADC versus clock duty cycle
Clock Buffer Gain
When using a sinusoidal clock input, the noise contributed by clock jitter improves as the clock amplitude is
increased. Therefore, using a large amplitude clock is recommended. In addition, the clock buffer has a
programmable gain option to amplify the input clock. The clock buffer gain can be set by programming the
register bits <CLKIN GAIN> (Table 14). The clock buffer gain decreases monotonically from Gain 4 to Gain 0
settings.
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Programmable Gain
ADS5517 has programmable gain from 0 dB to 6 dB in steps of 1 dB. The corresponding full-scale input range
varies from 2 VPP down to 1 VPP, with 0 dB being the default gain. At high IF, this is especially useful as the
SFDR improvement is significant with marginal degradation in SNR.
The gain can be programmed using the serial interface (bits D3-D0 in register 0x68).
Power Down
ADS5517 has three power-down modes – global STANDBY, output buffer disabled, and input clock stopped.
Global STANDBY
This mode can be initiated by controlling SDATA (pin 28) or by setting the register bit <STBY> (Table 10)
through the serial interface. In this mode, the A/D converter, reference block and the output buffers are powered
down and the total power dissipation reduces to about 100 mW. The output buffers are in high impedance state.
The wake-up time from the global power down to data becoming valid normal mode is maximum 100 µs.
Output Buffer Disable
The output buffers can be disabled using OE pin 7 in both the LVDS and CMOS modes, reducing the total power
by about 100 mW. With the buffers disabled, the outputs are in high impedance state. The wake-up time from
this mode to data becoming valid in normal mode is maximum 1 µs in LVDS mode and 50 ns in CMOS mode.
Input Clock Stop
The converter enters this mode when the input clock frequency falls below 1 MSPS. The power dissipation is
about 100 mW and the wake-up time from this mode to data becoming valid in normal mode is maximum 100 µs.
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Power Scaling Modes
ADS5517 has a power scaling mode in which the device can be operated at reduced power levels at lower
sampling frequencies with no difference in performance. (See Figure 29)(1) There are four power scaling modes
for different sampling clock frequency ranges, using the serial interface register bits <SCALING> (Table 16).
Only the AVDD power is scaled, leaving the DRVDD power unchanged.
Table 19. Power Scaling vs Sampling Speed
Sampling Frequency
MSPS
Analog Power
(Typical)
Power Scaling Mode
Analog Power in Default Mode
> 150
105 to 150
50 to 105
< 50
Default
1010 mW at 200 MSPS
841 mW at 150 MSPS
670 mW at 105 MSPS
525 mW at 50 MSPS
1010 mW at 200 MSPS
917 mW at 150 MSPS
830 mW at 105 MSPS
760 mW at 50 MSPS
Power Mode 1
Power Mode 2
Power Mode 3
(1) The performance in the power scaling modes is from characterization and not tested in production.
Power Supply Sequence
During power-up, the AVDD and DRVDD supplies can come up in any sequence. The two supplies are
separated inside the device. Externally, AVDD and DRVDD can be driven from separate supplies or from a
single supply.
Digital Output Information
ADS5517 provides 11-bit data, an output clock synchronized with the data and an out-of-range indicator that
goes high when the output reaches the full-scale limits. In addition, output enable control (OE pin 7) is provided
to power down the output buffers and put the outputs in high-impedance state.
Output Interface
Two output interface options are available – Double Data Rate (DDR) LVDS and parallel CMOS. The options are
selected using the DFS (see Table 6) or the serial interface register bit <ODI> (Table 15).
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DDR LVDS Outputs
In this mode, the 11 data bits and the output clock are available as LVDS (Low Voltage Differential Signal) levels.
Two successive data bits are multiplexed and output on each LVDS differential pair as shown in Figure 42. So,
there are 6 LVDS output pairs for the 11 data bits and 1 LVDS output pair for the output clock.
Pins
CLKOUTP
Output Clock
CLKOUTM
LOW_D0_P
Data Bits Low, D0
LOW_D0_M
D1_D2_P
Data Bits D1, D2
D1_D2_M
D3_D4_P
Data Bits D3, D4
D3_D4_M
D5_D6_P
Data Bits D5, D6
D5_D6_M
D7_D8_P
Data Bits D7, D8
D7_D8_M
D9_D10_P
Data Bits D9, D10
D9_D10_M
OVR
Out-of-Range Indicator
Figure 42. DDR LVDS Outputs
Even data bits D0, D2, D4, D6, D8, and D10 are output at the rising edge of CLKOUTP and the odd data bits D1,
D3, D5, D7, and D9 are output at the falling edge of CLKOUTP. Both the rising and falling edges of CLKOUTP
must be used to capture all the 11 data bits (see Figure 43).
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CLKOUTP
CLKOUTM
LOW_D0_P,
LOW_D0_M
LOW
D1
D0
D2
LOW
D1
D0
D2
D1_D2_P,
D1_D2_M
D3_D4_P,
D3_D4_M
D3
D4
D3
D4
D5_D6_P,
D5_D6_M
D5
D6
D5
D6
D7_D8_P,
D7_D8_M
D7
D8
D7
D8
D9_D10_P,
D9_D10_M
D9
D10
D9
D10
Sample N
Sample N+1
Figure 43. DDR LVDS Interface
LVDS Buffer Current Programmability
The default LVDS buffer output current is 3.5 mA. When terminated by 100 Ω, the results is a 350-mV
single-ended voltage swing (700-mVPP differential swing). The LVDS buffer currents can also be programmed to
2.5 mA, 4.5 mA, and 1.75 mA using the register bits <LVDS CURR> (Table 17). In addition, there exists a
current double mode, where this current is doubled for the data and output clock buffers (register bits <CURR
DOUBLE>, Table 18).
LVDS Buffer Internal Termination
An internal termination option is available (using the serial interface), by which the LVDS buffers are differentially
terminated inside the device. The termination resistences available are – 325, 200, and 170 Ω (nominal with
±20% variation). Any combination of these three terminations can be programmed; the effective termination is
the parallel combination of the selected resistences. This results in eight effective terminations from open (no
termination) to 75 Ω.
The internal termination helps to absorb any reflections coming from the receiver end, improving the signal
integrity. With 100-Ω internal and 100-Ω external termination, the voltage swing at the receiver end is halved
(compared to no internal termination). The voltage swing can be restored by using the LVDS current double
mode. Figure 44 shows the eye diagram of one of the LVDS data outputs with a 10-pF load capacitance (from
each pin to ground) and 100-Ω internal termination enabled. The termination can be programmed using register
bits <DATA TERM> and <CLKOUT TERM> (Table 17).
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Figure 44. Eye Diagram of LVDS Data Output With Internal Termination
Parallel CMOS
In this mode, the 11 data outputs and the output clock are available as 3.3-V CMOS voltage levels. Each data bit
and the output clock is available on a separate pin in parallel. By default, the data outputs are valid during the
rising edge of the output clock. The output clock is CLKOUT (pin 5).
CMOS Mode Power Dissipation
With CMOS outputs, the DRVDD current scales with the sampling frequency and the load capacitance on every
output pin (see Figure 30). The maximum DRVDD current occurs when each output bit toggles between 0 and 1
every clock cycle. In actual applications, this condition is unlikely to occur. The actual DRVDD current is
determined by the average number of output bits switching, which is a function of the sampling frequency and
the nature of the analog input signal.
Digital current due to CMOS output switching = CL x VDRVDD x (N x FAVG
)
where CL = load capacitance, N x FAVG = average number of output bits switching
Figure 30 shows the current with various load capacitances across sampling frequencies at 2MHz analog input
frequency.
Output Switching Noise and Data Position Programmability (in CMOS mode ONLY)
Switching noise (caused by CMOS output data transitions) can couple into the analog inputs during the instant of
sampling and degrade the SNR. To minimize this, the device includes programmable options to move the output
data transitions with respect to the output clock. This can be used to position the data transitions at the optimum
place away from the sampling instant and improve the SNR. Figure 30 shows the variation of SNR for different
CMOS output data positions at 200 MSPS.
Note that the optimum output data position varies with the sampling frequency. The data position can be
programmed using the register bits <DATA POSN> (Table 9).
It is recommended to put series resistors (50 to 100 Ω) on each output line placed close to the converter pins.
This helps to isolate the outputs from seeing large load capacitances and in turn reduces the amount of switching
noise. For example, the data in Figure 30 was taken with 50-Ω resistors on each output line.
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Output Clock Position Programmability
In both the LVDS and CMOS modes, the output clock can be moved around its default position. This can be
done using SEN pin 27 (as described in Table 5) or using the serial interface register bits <CLKOUT POSN>
(Table 9). Using this allows to trade-off the setup and hold times leading to reliable data capture. There also
exists an option to align the output clock edge with the data transition.
Note that programming the output clock position also affects the clock propagation delay times.
Output Data Format
Two output data formats are supported – 2's complement and offset binary. They can be selected using the DFS
(pin 6) or the serial interface register bit <DF> (Table 10).
Out-of-Range Indicator (OVR)
When the input voltage exceeds the full-scale range of the ADC, OVR (pin 3) goes high, and the output code is
clamped to the appropriate full-scale level for the duration of the overload. For a positive overdrive, the output
code is 0x7FF in offset binary output format, and 0x3FF in 2's complement output format. For a negative input
overdrive, the output code is 0x000 in offset binary output format and 0x400 in 2's complement output format.
Figure 45 shows the behavior of OVR during the overload. Note that OVR and the output code react to the
overload after a latency of 14 clock cycles.
POL − Positive overload code
0x7FF for straight binary
0x3FF for 2s complement
NOL − Negative overload code
0x000 for straight binary
0x400 for 2s complement
Figure 45. OVR During Input Overvoltage
Output Timing
For the best performance at high sampling frequencies, ADS5517 uses a clock generator circuit to derive internal
timing for ADC. This results in optimal setup and hold times of the output data and 50% output clock duty cycle
for sampling frequencies from 80 MSPS to 200 MSPS. See Table 20 for timing information above 80 MSPS.
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(1)
Table 20. Timing Characteristics (80 MSPS to 200 MSPS)
tsu DATA SETUP TIME, ns
th DATA HOLD TIME, ns
TYP
tPDI CLOCK PROPAGATION DELAY, ns
Fs, MSPS
MIN
TYP
MAX
MIN
MAX
MIN
TYP
MAX
DDR LVDS
190
1.2
1.3
1.6
2.0
3.6
1.7
1.8
2.1
2.5
4.1
0.4
0.5
0.6
0.8
1.6
0.9
1.0
1.1
1.3
2.1
4.0
3.9
4.3
4.5
4.7
4.7
4.6
5.0
5.2
5.7
5.4
5.3
5.7
5.9
6.7
170
150
130
80
PARALLEL CMOS
190
170
150
130
80
2.2
2.5
2.8
3.3
6.0
3.0
3.3
3.6
4.1
7.0
0.5
0.8
1.2
1.7
3.7
0.9
1.2
1.6
2.1
4.1
2.4
1.9
3.2
2.7
2.5
1.9
12
4.0
3.5
1.7
3.3
1.1
2.7
10.8
13.2
(1) Timing parameters are specified by design and characterization and not tested in production.
Below 80 MSPS, the setup and hold times do not scale with the sampling frequency. The output clock duty cycle
also progressively moves away from 50% as the sampling frequency is reduced from 80 MSPS.
See Table 21 for timings at sampling frequencies below 80 MSPS. Figure 46 shows the clock duty cycle across
sampling frequencies in the DDR LVDS and CMOS modes.
(1)
Table 21. Timing Characteristics (1 MSPS to 80 MSPS)
tsu DATA SETUP TIME, ns
TYP MAX
th DATA HOLD TIME, ns
TYP
tPDI CLOCK PROPAGATION DELAY, ns
Fs, MSPS
MIN
3.6
6
MIN
1.6
MAX
MIN
TYP
5.7
12
MAX
DDR LVDS
1 to 80
PARALLEL CMOS
1 to 80
3.7
(1) Timing parameters are specified by design and characterization and not tested in production.
100
90
80
70
DDR LVDS
50% Duty Cycle
60
50
40
CMOS
45% Duty Cycle
30
20
10
0
0
20 40 60 80 100 120 140 160 180 200
Sampling Frequency − MHz
Figure 46. Output Clock Duty Cycle (Typical) vs Sampling Frequency
The latency of ADS5517 is 14 clock cycles from the sampling instant (input clock rising edge). In the LVDS
mode, the latency remains constant across sampling frequencies. In the CMOS mode, the latency is 14 clock
cycles above 80 MSPS and 13 clock cycles below 80 MSPS.
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Board Design Considerations
Grounding
A single ground plane is sufficient to give good performance, provided the analog, digital and clock sections of
the board are cleanly partitioned. See the EVM User Guide (SLWU028) for details on layout and grounding.
Supply Decoupling
As the ADS5517 already includes internal decoupling, minimal external decoupling can be used without loss in
performance. Note that decoupling capacitors can help to filter external power supply noise, so the optimum
number of capacitors would depend on the actual application. The decoupling capacitors should be placed close
to the converter supply pins.
It is recommended to use separate supplies for the analog and digital supply pins to isolate digital switching
noise from sensitive analog circuitry. If only a single 3.3V supply is available, it should be routed first to AVDD. It
can then be tapped and isolated with a ferrite bead (or inductor) with decoupling capacitor, before being routed to
DRVDD.
Series Resistors on Data Outputs
It is recommended to put series resistors (50 to 100 Ω) on each output line placed close to the converter pins.
This helps to isolate the outputs from seeing large load capacitances and in turn reduces the amount of switching
noise.
Exposed Thermal Pad
It is necessary to solder the exposed pad at the bottom of the package to a ground plane for best thermal
performance. For detailed information, see application notes QFN Layout Guidelines (SLOA122) and QFN/SON
PCB Attachment (SLUA271).
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DEFINITION OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the power of the fundamental is reduced by 3 dB with respect to the low
frequency value.
Aperture Delay
The delay in time between the rising edge of the input sampling clock and the actual time at which the sampling
occurs.
Aperture Uncertainty (Jitter)
The sample-to-sample variation in aperture delay.
Clock Pulse Width/Duty Cycle
The duty cycle of a clock signal is the ratio of the time the clock signal remains at a logic high (clock pulse width)
to the period of the clock signal. Duty cycle is typically expressed as a percentage. A perfect differential
sine-wave clock results in a 50% duty cycle.
Maximum Conversion Rate
The maximum sampling rate at which certified operation is given. All parametric testing is performed at this
sampling rate unless otherwise noted.
Minimum Conversion Rate
The minimum sampling rate at which the ADC functions.
Differential Nonlinearity (DNL)
An ideal ADC exhibits code transitions at analog input values spaced exactly 1 LSB apart. The DNL is the
deviation of any single step from this ideal value, measured in units of LSBs
Integral Nonlinearity (INL)
The INL is the deviation of the ADC’s transfer function from a best fit line determined by a least squares curve fit
of that transfer function, measured in units of LSBs.
Gain Error
The gain error is the deviation of the ADC’s actual input full-scale range from its ideal value. The gain error is
given as a percentage of the ideal input full-scale range.
Offset Error
The offset error is the difference, given in number of LSBs, between the ADC’s actual average idle channel
output code and the ideal average idle channel output code. This quantity is often mapped into mV.
Temperature Drift
The temperature drift coefficient (with respect to gain error and offset error) specifies the change per degree
Celsius of the parameter from TMIN to TMAX. It is calculated by dividing the maximum deviation of the parameter
across the TMIN to TMAX range by the difference TMAX–TMIN
.
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Signal-to-Noise Ratio
SNR is the ratio of the power of the fundamental (PS) to the noise floor power (PN), excluding the power at dc
and the first nine harmonics.
P
P
s
SNR + 10Log10
N
(4)
SNR is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the
reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s
full-scale range.
Signal-to-Noise and Distortion (SINAD)
SINAD is the ratio of the power of the fundamental (PS) to the power of all the other spectral components
including noise (PN) and distortion (PD), but excluding dc.
P
s
SINAD + 10Log10
P
) P
N
D
(5)
SINAD is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the
reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s
full-scale range.
Effective Number of Bits (ENOB)
The ENOB is a measure of a converter’s performance as compared to the theoretical limit based on quantization
noise.
SINAD * 1.76
ENOB +
6.02
(6)
(7)
Total Harmonic Distortion (THD)
THD is the ratio of the power of the fundamental (PS) to the power of the first nine harmonics (PD).
P
P
s
THD + 10Log10
N
THD is typically given in units of dBc (dB to carrier).
Spurious-Free Dynamic Range (SFDR)
The ratio of the power of the fundamental to the highest other spectral component (either spur or harmonic).
SFDR is typically given in units of dBc (dB to carrier).
Two-Tone Intermodulation Distortion
IMD3 is the ratio of the power of the fundamental (at frequencies f1 and f2) to the power of the worst spectral
component at either frequency 2f1–f2 or 2f2–f1. IMD3 is either given in units of dBc (dB to carrier) when the
absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when the power of the
fundamental is extrapolated to the converter’s full-scale range.
DC Power Supply Rejection Ratio (DC PSRR)
The DC PSSR is the ratio of the change in offset error to a change in analog supply voltage. The DC PSRR is
typically given in units of mV/V.
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AC Power Supply Rejection Ratio (AC PSRR)
AC PSRR is the measure of rejection of variations in the supply voltage of the ADC. If ΔVSUP is the change in the
supply voltage and ΔVOUT is the resultant change in the ADC output code (referred to the input), then
DVOUT
PSRR = 20Log10
(Expressed in dBc)
DVSUP
(8)
Common Mode Rejection Ratio (CMRR)
CMRR is the measure of rejection of variations in the input common-mode voltage of the ADC. If ΔVcm is the
change in the input common-mode voltage and ΔVOUT is the resultant change in the ADC output code (referred
to the input), then
DVOUT
10
CMRR = 20Log
(Expressed in dBc)
DVCM
(9)
Voltage Overload Recovery
The number of clock cycles taken to recover to less than 1% error for a 6-dB overload on the analog inputs. A
6-dBFS sine wave at Nyquist frequency is used as the test stimulus.
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PACKAGE OPTION ADDENDUM
www.ti.com
20-Mar-2008
PACKAGING INFORMATION
Orderable Device
ADS5517IRGZR
ADS5517IRGZRG4
ADS5517IRGZT
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
QFN
RGZ
48
48
48
48
2500 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
QFN
QFN
QFN
RGZ
RGZ
RGZ
2500 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
ADS5517IRGZTG4
250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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 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 1
PACKAGE MATERIALS INFORMATION
www.ti.com
19-Mar-2008
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0 (mm)
B0 (mm)
K0 (mm)
P1
W
Pin1
Diameter Width
(mm) W1 (mm)
(mm) (mm) Quadrant
ADS5517IRGZR
ADS5517IRGZT
QFN
QFN
RGZ
RGZ
48
48
2500
250
330.0
330.0
16.4
16.4
7.3
7.3
7.3
7.3
1.5
1.5
12.0
12.0
16.0
16.0
Q2
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
19-Mar-2008
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
ADS5517IRGZR
ADS5517IRGZT
QFN
QFN
RGZ
RGZ
48
48
2500
250
333.2
333.2
345.9
345.9
28.6
28.6
Pack Materials-Page 2
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