SM843251-156 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – ClockWorks™ 10-Gigabit Ethernet, 156.25MHz, Ultra-Low Jitter LVPECL Clock Frequency Synthesizer

SM843251-156
ClockWorks™ 10-Gigabit Ethernet,
156.25MHz, Ultra-Low Jitter LVPECL Clock
Frequency Synthesizer
General Description
The SM843251-156 is a 10-Gigabit Ethernet, 156.25MHz
LVPECL clock frequency synthesizer and a member of the
ClockWorks™ family of devices from Micrel. It provides a
low-noise timing solution for high-speed, high-accuracy
synthesis of clock signals. It includes a patented
RotaryWave^® architecture that provides a very stable clock
with very low noise.
Power supplies of either 2.5V or 3.3V are supported, with
superior jitter and phase noise performance. The device
synthesizes a 156.25MHz, low-noise, LVPECL output for
Ethernet applications. The crystal reference frequency is
25MHz.
The SM843251-156 is an excellent replacement for IDT
FemtoClocks®, with improved waveform integrity, and
jitter.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Generates a low-noise 156.25MHz LVPECL output
• 2.5V or 3.3V operating voltage
• Typical phase jitter @156.25MHz~110fs
(1.875MHz − 20MHz)
• Crystal frequency: 25MHz
• 156.25MHz output frequency
• Phase Noise @ 156.25MHz:
− 1kHz: −123dBc/Hz
− 10kHz: −130dBc/Hz
− 100kHz: −135dBc/Hz
− 1MHz: −140dBc/Hz
− 10MHz: −161dBc/Hz
− 20MHz: −166/dBc/Hz
• Industrial temperature range
• Green-, RoHS-, and PFOS-compliant
• Available in 8-pin TSSOP
Applications
• Gigabit Ethernet
• 10-Gigabit Ethernet
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Block Diagram
ClockWorks is a trademark of Micrel, Inc.
RotaryWave is a registered trademark of Multigig, Inc.
FemtoClocks is a registered trademark of IDT, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2010
M9999-100110-A
[e-mail] or [phone]