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CS61600 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers

Part No. CS61600
Description  PCM JITTER ATTENUATOR
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Maker  ETC1 [List of Unclassifed Manufacturers]
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APPLICATIONS
Selecting an Oscillator Crystal
Specific crystal parameters are required for
proper operation of the CS61600. It is recom-
me nd ed that th e Crystal Semi conducto r
CXT6176 crystal be used for T1 applications
and the CXT8192 crystal be used for PCM-30
applications.
General Applications
The CS61600 will tolerate and attenuate at least
seven unit intervals of jitter over the specified
range of input clock and oscillator frequencies. If
the oscillator crystal is chosen so that the center
frequency of its pull range is close to the input
frequency, CLKIN, the CS61600 will tolerate
more jitter; up to 14 unit intervals will be toler-
ated under optimal conditions.
Consider the case where the average clock
frequency at CLKIN approaches the slow end of
the range, 1.544 MHz - 130 ppm. In this case,
the oscillator will be near the bottom of its
pull range, restricting its ability to achieve
frequencies well below the CLKIN frequency.
The result is that the read pointer of the FIFO
will begin to catch up to the write pointer. If
enough jitter is introduced, the read pointer will
overtake the write pointer resulting in an error
(i.e. the device will try to read out data before it
is written in). A similar situation occurs when
the CLKIN signal approaches the fast end of its
range, 1.544 MHz + 130 ppm.
Taking care in selecting the proper crystal can
result in improved jitter tolerance without de-
grading the performance of the CS61600. If the
center frequency of the oscillator is precisely
four times the CLKIN frequency, and the crystal
has at least the specified pull range, the CS61600
will tolerate 14 unit intervals of jitter. In this
case, the read and write pointers of the FIFO
will maintain optimal separation
when the
signal is jitter free, allowing the device to toler-
ate maximum jitter input.
Master/Slave Configuration
Some T1 applications require separate repre-
sentations of the positive and negative going
pulses for an AMI signal. Two CS61600s can be
used to remove jitter from a set of signals con-
sisting of POS, NEG and CLK. Figure A2 shows
the master/slave configuration.
This configuration requires one crystal (on the
master). The CLKOUT signal from the master
controls the FIFO read pointer of the slave
CS61600. Setting ARE, pin 6, of the slave to
logic 1 directs the device to use the clock input
to ARC, pin 12, to control the FIFO read pointer.
For this configuration to function properly, the
positions of the FIFO read and write pointers in
both devices must correspond. The FIFO pointer
reset, FIFORST, of both devices must be tied to-
RESET
FIFORST
OVR
XTALIN
ARE
GND
V+
DIN
ARC
OSCOUT
CLKOUT
DOUT
CLKIN
14
13
12
11
10
9
8
1
2
3
4
5
6
7
JITTERED CLOCK INPUT
JITTER FREE CLOCK
JITTER FREE DATA
JITTERED DATA INPUT
+5V
V+
RESET
V+
10k
10k
XTALOUT
200k
6.176 MHz
Figure A1. Typical Application Circuit
CS61600
10
DS9F3




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