Integrated
Circuit
Systems, Inc.
ICS9120-46
Modem and Audio Clock Generator
General Description
The
ICS9120-46
is a high performance frequency generator
designed to support the clock requirements of communication
and audio interfaces. It offers the clock frequencies required
by 28.8 baud modem plus sound system. These frequencies
are synthesized from 14.7456 MHz reference oscillator whose
buffered output is available for the reference.
High accuracy, low-jitter PLLs meet the -96dB signal-to-
noise ratios required by 16-bit audio systems. Fast output
clock edge rates minimize board induced jitter.
The on-chip XTAL oscillator accuracy is better than 鹵100ppm
for an AT cut, 18pF load crystal with initial accuracy of ppm
plus TC, aging and load variation of 鹵20ppm each assuming
33pF 鹵5% external load capacitors.
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Features
Generates 49.92 MHz, 40.32 MHz and 14.7456 MHz
Single 14.7456 MHz crystal reference
49.92 MHz accuracy tracks 40.32 MHz reference
80ps one sigma jitter maintains 16-bit performance
Output rise/fall times less than 1.5ns
On-chip loop filter components
3.0-5.5V supply range
8-pin, 150-mil SOIC package
Applications
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Specifically designed to support the high performance
requirements of communication and audio interfaces.
Block Diagram
9120-46 Rev B 052497P
ICS reserves the right to make changes in the device data identified in this
publication without further notice. ICS advises its customers to obtain the latest
version of all device data to verify that any information being relied upon by the
customer is current and accurate.
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