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SM840004-11 Fiches technique(PDF) 1 Page - Micrel Semiconductor

No de pièce SM840004-11
Description  62.5/125MHz Gigabit Ethernet, 4 Output, Ultra-Low Jitter Clock Synthesizer
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Fabricant  MICREL [Micrel Semiconductor]
Site Internet  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

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SM840004-11
62.5/125MHz Gigabit Ethernet, 4 Output,
Ultra-Low Jitter Clock Synthesizer
RotaryWave is a 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
July 2010
M9999-070110-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SM840004-11 clock synthesizer was designed for
Gigabit Ethernet applications. The device design is
optimized for 62.5MHz and 125MHz using a standard
25MHz fundamental parallel resonant crystal, with
unparalleled stability and accuracy over the full operating
range, and provides an easy fit for Jitter and Phase Noise
standards for these high performance interfaces.
The SM840004-11 design includes a unique power
reduction
methodology,
along
with
a
patented
RotaryWave™ architecture, that provides a stable clock
with very low noise for optimized performance. This yields
an overall improved Bit Error Rate (BER) and improved
waveform integrity.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Generates 4 optimized LVCMOS clock outputs
• RMS phase jitter @ 125MHz: ~55 fs (typ)
• Integrated loop filter components
• Operates with either a 3.3V or 2.5V supply
• Power consumption 65mA (typ @ 2.5V)
• Selectable output frequency: 125MHz or 62.5MHz
• Input frequency of 25MHz
• Fundamental parallel resonant crystal interface
• Pin compatible with the ICS/IDT840004-11
• Industrial temperature range: –40°C to +85°C
• Green, RoHS-compliant and PFOS-compliant
___________________________________________________________________________________________________________
Block Diagram


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