SM802117 查看數據表（PDF） - Micrel
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SM802117 Datasheet PDF : 10 Pages
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SM802117
ClockWorks™ GbE (125MHz)
Ultra-Low Jitter, LVPECL
Frequency Synthesizer
General Description
The SM802117 is a member of the ClockWorks™ family of
devices from Micrel and provides an extremely low-noise
timing solution for GbE 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 LVPECL output clocks at 125MHz. There
are two differential clock outputs each with it’s own OE pin
allowing them to be disabled independently. The
SM802117 accepts a 25 MHz crystal or LVCMOS
reference clock.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
HU
UH
Features
• Generates one or two LVPECL clock outputs at 125MHz
• 2.5V or 3.3V operating range
• Typical phase jitter @ 125MHz
(1.875MHz to 20MHz): 115fs
• Industrial temperature range (–40°C to +85°C)
• Green, RoHS, and PFOS compliant
• Available in 24-pin 4mm × 4mm QFN package
Applications
• Gigabit Ethernet - PHY
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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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2011
M9999-101311-B
hbwhelp@micrel.com or (408) 955-1690
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