SM802121

ClockWorks

 10GbE

(156.25MHz), Ultra-Low Jitter, LVPECL

Frequency Synthesizer

ClockWorks is a trademark of Micrel, Inc

RotaryWave is a registered trademark of Multigig, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

January 2012

M9999-011212-A

General Description

The SM802121 is a member of the ClockWorks

 family of

devices from Micrel and provides an extremely low-noise

timing solution for 10GbE Ethernet clock signals. It is

based upon a unique patented RotaryWave

that provides very-low phase noise.

The device operates from a 2.5V or 3.3V power supply

and synthesizes an LVPECL output clock at 156.25MHz.

The SM802121 accepts a 25MHz crystal or LVCMOS

reference clock.

Data sheets and support documentation can be found on

Features

 Generates one LVPECL clock outputs at 156.25MHz

 2.5V or 3.3V operating range

 Typical phase jitter @ 156.25MHz

(1.875MHz to 20MHz): 110fs

 Industrial temperature range

 Green, RoHS-, and PFOS- compliant

 Available in 24-pin 4mm  4mm QFN package

Applications

 10 Gigabit Ethernet

Block Diagram