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SM840051KA датащи(PDF) 5 Page - Micrel Semiconductor

номер детали SM840051KA
подробное описание детали  10 Gigabit Ethernet Ultra-Low Jitter Clock Synthesizer
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SM840051KA датащи(HTML) 5 Page - Micrel Semiconductor

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Micrel, Inc.
SM840051
May 2010
5
M9999-050710-C
hbwhelp@micrel.com or (408) 955-1690
Functional Description
The SM840051 synthesizer provides a high performance
solution to frequency generation. Low cost crystals of
20.141601MHz, 19.53125MHz, and 19.44MHz are used to
provide low jitter output clocks of 161.132MHz, 156.25MHz
, and 155.52MHz, respectively. A single LVCMOS output,
capable of driving a 50 ohm load, is provided, which may
be tri-stated by the OE input.
The design of the SM840051 consumes very low power in
the PLL due to a patented technology in the VCO and the
associated dividers. The VCO range is ~3.2GHz to 3.5GHz
providing high resolution and easy integer divide ratios.
Output Divider ratios are fixed at either ÷20 or ÷40
controlled via the FSEL pin, and the feedback divider also
fixed at ÷160. Duty Cycle is inherently improved and
guarantees tight control and stability on this critical
specification. This provides improved specifications for
Duty Cycle, Jitter, Phase Noise, Power Consumption, and
noise sensitivity. Additionally, the SM840051 will operate
at either 3.3V or 2.5V supplies.
RMS Phase Noise/Jitter
Phase Noise Plot: 156.25MHz @ 3.3V
Offset Frequency ( Hz)
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 58 fs (typical)
Noise Power
dBc/Hz
(Random)
1.875MHz to
20MHz


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