DSC2120 [MICREL]
Low-Jitter I2C/SPI Programmable LVPECL Oscillator;型号: | DSC2120 |
厂家: | MICREL SEMICONDUCTOR |
描述: | Low-Jitter I2C/SPI Programmable LVPECL Oscillator |
文件: | 总5页 (文件大小:664K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
DSC2120 DSC2220
Low-Jitter I2C/SPI Programmable LVPECL Oscillator
General Description
Features
The DSC2120 and DSC2220 series of
programmable, high-performance LVPECL
oscillators utilizes a proven silicon MEMS
technology to provide excellent jitter and
stability while incorporating high output
frequency flexibility. DSC2120 and DSC2229
allow the user to modify the output
frequency using I2C or SPI interface,
respectively. User can also select from two
pre-programmed default output frequencies
using the control pin.
Low RMS Phase Jitter: <1 ps (typ)
High Stability: ±10, ±25, ±50 ppm
Wide Temperature Range
o Industrial: -40° to 85° C
o Ext. commercial: -20° to 70° C
High Supply Noise Rejection: -50 dBc
I2C/SPI Programmable Output Freq
Short Lead Times: 2 Weeks
Wide Freq. Range:
o LVPECL Output: 2.3 to 460 MHz
DSC2120 and DSC2220 are packaged in 14-
pin 3.2x2.5 mm QFN packages and available
in temperature grades from Ext. Commercial
to Industrial.
Miniature Footprint of 3.2x2.5mm
Excellent Shock & Vibration Immunity
o Qualified to MIL-STD-883
High Reliability
o 20x better MTF than quartz oscillators
Block Diagram
Supply Range of 2.25 to 3.6 V
Lead Free & RoHS Compliant
Applications
Consumer Electronics
Storage Area Networks
o SATA, SAS, Fibre Channel
Passive Optical Networks
o EPON, 10G-EPON, GPON, 10G-PON
Ethernet
o 1G, 10GBASE-T/KR/LR/SR, and FCoE
HD/SD/SDI Video & Surveillance
PCI Express
Pin # DSC2120 (I2C)
DSC2220 (SPI)
3
5
6
7
NC
SDA
SCL
SCLK
MOSI
MISO
SS
CS_bar
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DSC2120 DSC2220 Page 1 MK-Q-B-P-D-12050103
Low-Jitter I2C/SPI Programmable LVPECL Oscillator
DSC2120 DSC2220
Pin Description
Pin No. Pin Name Pin Type
Description
Enables outputs when high and disables when low
Leave unconnected or grounded
DSC2120: Leave unconnected or grounded
DSC2220: Serial clock from master
Ground
1
2
Enable
NC
I
NA
NA
I
Power
I
NC
3
4
5
SCLK
GND
SDA
MOSI
SCL
DSC2120: I2C Serial Data
DSC2220: SPI Serial Data from Master to Slave
I
O
I
I
O
DSC2120: I2C Serial Clock
6
7
MISO
CS_bar
SS
Output1+
Output1-
NC
DSC2220: SPI Serial Data from Slave to Master
DSC2120: I2C Chip Select (Active Low)
DSC2220: SPI Slave Select (Active Low)
Positive LVPECL Output
8
9
O
NA
Negative LVPECL Output
10
11
12
13
14
Leave unconnected or grounded
Leave unconnected or grounded
Power Supply
Power Supply
Default output clock frequency bit
NC
NA
VDD2
VDD
FS
Power
Power
I
Operational Description
The DSC2120/2220 is a LVPECL oscillator
consisting of a MEMS resonator and a support
pin (FS) selects the initial frequency. Once
the device is powered up, a new output
frequency can be programmed. Programming
details are provided in the Programming
Guide. Standard default frequencies are
described in the following sections. Discera
supports customer defined versions of the
DSC2120/2220.
PLL IC.
The LVPECL output is generated
through independent 8-bit programmable
dividers from the output of the internal PLL.
DSC2120/2220 allows for easy programming
of the output frequencies using I2C/SPI
interface. Upon power-up, the initial output
frequency is controlled by an internal pre-
programmed memory (OTP). This memory
stores all coefficients required by the PLL for
two different default frequencies. The control
When Enable (pin 1) is floated or connected to
VDD, the DSC2120/2220 is in operational
mode. Driving Enable to ground will disable
both output drivers (hi-impedance mode).
Default Output Clock Frequencies
Table 2 lists the standard frequency configurations and the associated ordering information to be
used in conjunction with the ordering code. Customer defined combinations are available.
Table 2. Pre-programmed pin-selectable output frequency combinations
Select Bit [FS] – Default is [1]
Ordering
Info
Freq
(MHz)
0
1
B0001
BXXXX
fOUT
fOUT
125
212.5
Contact factory for additional configurations.
Frequency select bit are weakly tied high so if left unconnected the default setting will be [1] and
the device will output the associated frequency highlighted in Bold.
______________________________________________________________________________________________________________________________________________
DSC2120 DSC2220
Page 2
MK-Q-B-P-D-12050103
Low-Jitter I2C/SPI Programmable LVPECL Oscillator
DSC2120 DSC2220
Absolute Maximum Ratings
Ordering Code
Item
Min
Max
Unit Condition
Prog Mode
1: I2C bus
2: SPI bus
Temp Range
E: -20 to 70
I: -40 to 85
Packing
T: Tape & Reel
: Tube
Supply Voltage
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
-0.3
+4.0
V
V
-0.3 VDD+0.3
-
-55
-
+150
+150
+260
°C
°C
°C
V
DSC2 1 20 F I 2
xxxxx
T
40sec max.
Package
F: 3.2x2.5mm
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
Freq (MHz)
See Freq. table
ESD
HBM
MM
-
4000
400
CDM
1500
Note: 1000+ years of data retention on internal memory
Specifications (Unless specified otherwise: T=25° C)
Parameter
Supply Voltage1
Condition
Min.
Typ.
Max.
3.6
23
Unit
VDD
IDD
IDD
2.25
V
Supply Current
Supply Current2
EN pin low – output is disabled
Output Enabled, RL=50Ω
21
mA
mA
56.5
58
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
±10
±25
±50
Frequency Stability
Δf
ppm
Aging
Startup Time2
Δf
tSU
1 year @25°C
T=25°C
±5
5
ppm
ms
Input Logic Levels
Input logic high
Input logic low
VIH
VIL
0.75xVDD
-
-
V
0.25xVDD
Output Disable Time3
Output Enable Time
Pull-Up Resistor4
tDA
5
ns
ns
tEN
20
Pull-up exists on all digital IO
40
kΩ
LVPECL Output
Output Logic Levels
Output logic high
Output logic low
VOH
VOL
RL=50Ω
VDD-1.08
-
-
V
VDD-1.55
Pk to Pk Output Swing
Output Transition time4
Rise Time
Single-Ended
800
250
mV
ps
20% to 80%
tR
tF
RL=50Ω
Fall Time
Frequency
f0
Single Frequency
Differential
2.3
48
460
52
MHz
%
Output Duty Cycle
Period Jitter5
SYM
JPER
FO=156.25 MHz
2.5
0.25
0.38
1.7
psRMS
200kHz to 20MHz @156.25MHz
100kHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
Integrated Phase Noise
JPH
psRMS
2
Notes:
1.
Pin 4 VDD should be filtered with 0.01uf capacitor.
2.
3.
4.
5.
Output is enabled if Enable pad is floated or not connected.
tsu is time to 100PPM stable output frequency after VDD is applied and outputs are enabled.
Output Waveform and Test Circuit figures below define the parameters.
Period Jitter includes crosstalk from adjacent output.
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DSC2120 DSC2220 Page 3 MK-Q-B-P-D-12050103
Low-Jitter I2C/SPI Programmable LVPECL Oscillator
DSC2120 DSC2220
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
LVPECL
LVPECL
LVPECL
LVPECL Phase jitter (integrated phase noise)
Output Waveform: LVPECL
tR
tF
Output
80%
830 mv
50%
20%
Output
tEN
1/fo
tDA
VIH
Enable
VIL
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DSC2120 DSC2220 Page 4 MK-Q-B-P-D-12050103
Low-Jitter I2C/SPI Programmable LVPECL Oscillator
DSC2120 DSC2220
Solder Reflow Profile
20-40
Sec
260°C
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max.
217°C
200°C
60-150
Sec
Preheat Time 150°C to 200°C
Time maintained above 217°C
Peak Temperature
Time within 5°C of actual Peak
Ramp-Down Rate
60-180 Sec
60-150 Sec
255-260°C
20-40 Sec
6°C/Sec Max.
8 min Max.
Reflow
60-180
Sec
150°C
Cool
Pre heat
25°C
Time 25°C to Peak Temperature
Time
8 min max
Package Dimensions
3.2 x 2.5 mm 14 Lead Plastic Package
Disclaimer:
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information
is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and
descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted
by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims
any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the
body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or
sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any
damages resulting from such use or sale.
MICREL, Inc.
Phone: +1 (408) 944-0800
●
●
2180 Fortune Drive,
Fax: +1 (408) 474-1000
San Jose, California
95131
●
●
USA
●
Email: hbwhelp@micrel.com
www.micrel.com
______________________________________________________________________________________________________________________________________________
DSC2120 DSC2220 Page 5 MK-Q-B-P-D-12050103
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