SI598 Datasheet, PDF (1/28 Pages) Silicon Laboratories – Programmable with 28 parts per trillion frequency resolution

Si598/Si599
1 0 – 8 1 0 M H Z I ²C P ROGRAMMABLE X O / V C X O
Features
 I²C programmable output
frequencies from 10 to 810 MHz
 0.5 ps RMS phase jitter
 Superior power supply rejection:
0.3–0.4 ps additive jitter
 Available LVPECL, CMOS, LVDS,
and CML outputs
 1.8, 2.5, or 3.3 V supply
 Pin- and register-compatible with
Si570/571
 Programmable with 28 parts per
trillion frequency resolution
 Integrated crystal provides stability
and low phase noise
 Frequency changes up to
±3500 ppm are glitchless
 –40 to 85 °C operation
 Industry-standard 5x7 mm package
Applications
 SONET / SDH / xDSL
 Ethernet / Fibre Channel
 3G SDI / HD SDI
 Multi-rate PLLs
 Multi-rate reference clocks
Description
 Frequency margining
 Digital PLLs
 CPU / FPGA FIFO control
 Adaptive synchronization
 Agile RF local oscillators
The Si598 XO/Si599 VCXO utilizes Silicon Laboratories' advanced DSPLL®
circuitry to provide a low-jitter clock at any frequency. They are user-
programmable to any output frequency from 10 to 810 MHz with 28 parts per
trillion (PPT) resolution. The device is programmed via a 2-pin I²C compatible
serial interface. The wide frequency range and ultra-fine programming resolution
make these devices ideal for applications that require in-circuit dynamic frequency
adjustments or multi-rate operation with non-integer related rates. Using an
integrated crystal, these devices provide stable low jitter frequency synthesis and
replace multiple XOs, clock generators, and DAC controlled VCXOs.
Functional Block Diagram
OE
Vc
(Si599)
V_DD
Power Supply Filtering
Fixed
Frequency
Oscillator
ADC
Any Frequency
DSPLL®
10 to 810 MHz
Clock Synthesis
I2C Interface
SDA
SCL
GND
CLK+
CLK–
Si5602
Ordering Information:
See page 22.
Pin Assignments:
See page 21.
(Top View)
SDA
7
NC ₁
6 VDD
OE 2
5 CLK–
GND 3
4 CLK+
8
SCL
Si598
V_{C 1}
SDA
7
6 VDD
OE 2
5 CLK–
GND 3
4
8
SCL
CLK+
Si599
Rev. 1.0 11/11
Copyright © 2011 by Silicon Laboratories
Si598/Si599