SM802124 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – ClockWorks™ DUAL 125MHz Ultra-Low Jitter, CMOS Frequency Synthesizer

SM802124
ClockWorks™ DUAL 125MHz
Ultra-Low Jitter, CMOS
Frequency Synthesizer
General Description
The SM802124 is a member of the ClockWorks™ family of
devices from Micrel and provides an extremely low-noise
timing solution for Ethernet clock signals. It is based upon
a unique patented RotaryWave^® architecture that provides
very-low phase noise.
The device operates from a 3.3V or 2.5V power supply
and synthesizes two CMOS output clocks at 125MHz from
a 15MHz LVCMOS reference clock.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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Features
• Generates two LVCMOS clock outputs at 125MHz
• 2.5V or 3.3V operating range
• Typical rms phase jitter @ 125MHz
1.875MHz to 20MHz : 85fs
(Input source dependent)
• Industrial temperature range (–40°C to +85°C)
• Green, RoHS, and PFOS compliant
• Available in 24-pin 4mm × 4mm QFN package
Applications
• Gigabit Ethernet
Block Diagram
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 [phone] • fax + 1 [phone] • http://www.micrel.com
September 2011
M9999-101311-B
[e-mail] or [phone]