Rev. 1.0 6/12

Copyright © 2012 by Silicon Laboratories

Si516

Features

Applications

Description

The Si516 dual frequency VCXO utilizes Silicon Laboratories' advanced PLL

technology to provide any frequency from 100 kHz to 250 MHz. Unlike a

traditional VCXO where a different crystal is required for each output

frequency, the Si516 uses one fixed crystal and Silicon Labs’ proprietary

synthesizer to generate any frequency across this range. This IC-based

approach allows the crystal resonator to provide enhanced reliability,

improved mechanical robustness, and excellent stability. In addition, this

solution provides superior control voltage linearity and supply noise

rejection, improving PLL stability and simplifying low jitter PLL design in

noisy environments. The Si516 is factory-configurable for a wide variety of

user specifications, including frequency, supply voltage, output format,

tuning slope and stability. Specific configurations are factory-programmed at

time of shipment, eliminating long lead times and non-recurring engineering

charges associated with custom frequency oscillators.

Functional Block Diagram



Supports any frequency from

100 kHz to 250 MHz



Two selectable output frequencies



Low-jitter operation



Short lead times: <2 weeks



AT-cut fundamental mode crystal

ensures high reliability/low aging



High power supply noise rejection



1% control voltage linearity



Available CMOS, LVPECL,

LVDS, and HCSL outputs



Optional 1:2 CMOS fanout buffer



3.3 and 2.5 V supply options



Industry-standard 3.2 x 5.0 mm

and 5 x 7 mm package/pinouts



Pb-free/RoHS-compliant



Selectable Kv (60, 90, 120,

150 ppm/V)



SONET/SDH/OTN



PON



Low Jitter PLLs



xDSL



Broadcast video



Telecom



Switches/routers



FPGA/ASIC clock generation

Ordering Information:

See page 14.

Pin Assignments:

See page 12.

Si5602

1

2

3

6

5

4

NC

CLK

GND

FS

Vc

CMOS Dual VCXO

1

2

3

6

5

4

CLK–

CLK+

GND

FS

Vc

LVPECL/LVDS/HCSL/Dual CM O S

Dual VCXO

Si516