Si598/Si599
2
10810 MHZ I C PROGRAMMABLE XO/VCXO
Features
2
Programmable with 28 parts per
I C programmable output
trillion frequency resolution
frequencies from 10 to 810 MHz
Si5602
Integrated crystal provides stability
0.5 ps RMS phase jitter
and low phase noise
Superior power supply rejection:
Frequency changes up to
0.30.4 ps additive jitter
3500 ppm are glitchless
Available LVPECL, CMOS, LVDS,
40 to 85 C operation
and CML outputs
Industry-standard 5x7 mm package
1.8, 2.5, or 3.3 V supply
Pin- and register-compatible with
Si570/571
Applications
Ordering Information:
See page 21.
SONET / SDH / xDSL Frequency margining
Ethernet / Fibre Channel Digital PLLs
3G SDI / HD SDI CPU / FPGA FIFO control
Pin Assignments:
Multi-rate PLLs Adaptive synchronization
Multi-rate reference clocks Agile RF local oscillators
See page 20.
Description
(Top View)
The Si598 XO/Si599 VCXO utilizes Silicon Laboratories' advanced DSPLL
SDA
circuitry to provide a low-jitter clock at any frequency. They are user-
7
programmable to any output frequency from 10 to 810 MHz with 28 parts per
NC
1 6 V
2 DD
trillion (PPT) resolution. The device is programmed via a 2-pin I C compatible
serial interface. The wide frequency range and ultra-fine programming resolution
make these devices ideal for applications that require in-circuit dynamic frequency
OE 2 5
CLK
adjustments or multi-rate operation with non-integer related rates. Using an
integrated crystal, these devices provide stable low jitter frequency synthesis and
GND 3 4 CLK+
replace multiple XOs, clock generators, and DAC controlled VCXOs.
8
Functional Block Diagram
SCL
Si598
V
DD
Power Supply Filtering
OE
SDA
Fixed 7
Any Frequency
CLK+
Frequency DSPLL
V
C 1 6 V
DD
10 to 810 MHz
Oscillator CLK
Clock Synthesis
OE 2 5
CLK
Vc
ADC
I2C Interface
(Si599)
GND 3 4 CLK+
8
SCL
SDA
SCL
GND
Si599
Rev. 1.1 6/18 Copyright 2018 by Silicon Laboratories Si598/Si599Si598/Si599
TABLE OF CONTENTS
Section Page
1. Detailed Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.1. Programming a New Output Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2
3.2. I C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4. Serial Port Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5. Si598 (XO) Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6. Si599 (VCXO) Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
7. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
8. Si59x Mark Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
9. Outline Diagram and Suggested Pad Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
10. 8-Pin PCB Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Rev. 1.1 2