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SI5322 датащи(PDF) 5 Page - Silicon Laboratories

номер детали SI5322
подробное описание детали  PIN-PROGRAMMABLE PRECISION CLOCK MULTIPLIER
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI5322 датащи(HTML) 5 Page - Silicon Laboratories

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Si5322
Preliminary Rev. 0.47
5
1. Functional Description
The Si5322 is a low jitter, precision clock multiplier for
high-speed communication systems, including SONET
OC-48/OC-192, Ethernet, and Fibre Channel. The
Si5322 accepts dual clock inputs ranging from 19.44 to
707 MHz and generates two frequency-multiplied clock
outputs ranging from 19.44 to 1050 MHz. The two input
clocks are at the same frequency and the two output
clocks are at the same frequency. The input clock
frequency and clock multiplication ratio are selectable
from a table of popular SONET, Ethernet, and Fibre
Channel
rates.
In
addition
to
providing
clock
multiplication in SONET and datacom applications, the
Si5322
supports
SONET-to-datacom
frequency
translations. Silicon Laboratories offers a PC-based
software utility, DSPLLsim, that can be used to look up
valid Si5322 frequency translations. This utility can be
downloaded
from
www.silabs.com/timing.
This
information is also available in the Any-Rate Precision
Clock Family Reference Manual, also available from
www.silabs.com/timing.
The Si5322 is recommended for applications in which
the input clock is relatively low jitter and only clock
multiplication is required. The Si5322 is based on
Silicon
Laboratories'
3rd-generation
DSPLL®
technology,
which
provides
any-rate
frequency
synthesis in a highly integrated PLL solution that
eliminates the need for external VCXO and loop filter
components. The Si5322 PLL loop bandwidth is
selectable via the BWSEL[1:0] pins and supports a
range from 30 kHz to 1.5 MHz. The DSPLLsim software
utility can be used to calculate valid loop bandwidth
settings for a given input clock frequency/clock
multiplication ratio. The Si5322 monitors all input clocks
for loss of signal and provides a LOS alarm when it
detects a missing clock.
In the case when the input clocks enter alarm
conditions, the PLL will freeze the DCO output
frequency near its last value to maintain operation with
an internal state close to the last valid operating state.
The Si5322 has two differential clock outputs. The
electrical format of the clock outputs is programmable to
support LVPECL, LVDS, CML, or CMOS loads. If not
required, the second clock output can be powered down
to minimize power consumption. The phase difference
between the selected input clock and the output clocks
is adjustable in 200 ps increments for system skew
control. For system-level debugging, a bypass mode is
available which drives the output clock directly from the
input clock, bypassing the internal DSPLL. The device is
powered by a single 1.8, 2.5, or 3.3 V supply.
1.1. Further Documentation
Consult the Silicon Laboratories Any-Rate Precision
Clock Family Reference Manual (FRM) for more
detailed information about the Si5322. The FRM can be
downloaded from www.silabs.com/timing.
Silicon Laboratories has developed a PC-based
software utility called DSPLLsim to simplify device
configuration, including frequency planning and loop
bandwidth selection. This utility can be downloaded
from www.silabs.com/timing.


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