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ICS9117M-01 Datasheet

  • ICS9117M-01

  • Frequency Generator for Modem Systems

  • 5頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9117-01
Frequency Generator for Modem Systems
General Description
The
ICS9117-01
is a low-cost, high-performance frequency
generator designed to support fax/data modem systems.
Datapump and UART clocks are synthesized from a
microcontroller crystal using high-accuracy, low-jitter PLLs,
meeting the frequency tolerance and -96dB signal-to-noise
ratios required by 16-bit DSP modem systems. Fast output
clock edge rates minimize board induced jitter.
Exact frequency multiplying ratios ensure better than 鹵80
ppm frequency accuracy using a standard AT crystal with
external load capacitors (typically 33pF 鹵5% for an 18pF
series load crystal). Achieving 鹵80ppm over four years
requires the crystal to have 20 ppm initial accuracy, 鹵20 ppm
temperature and 鹵5 ppm/year aging coefficients.
Features
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Generates the 14.7456 MHz microcontroller, 40.320
MHz datadump and 1.84320 UART clocks
Less than 鹵80 ppm frequency variation including
temperature, voltage, load and aging tolerances
Single crystal reference minimizes crystal reliability
and inventory issues
80 ps one sigma jitter maintains 16-bit performance
Output rise/fall times less than 1.5 ns
On-chip loop filter components
3.0 V - 5.5 V supply range
8-pin, 150-mil SOIC package
Applications
Specifically designed to support the high performance
of fax/data modems
Block Diagram
14.7456
MHz
X2
X1
XTAL
OSC
PCLK
梅8
PLL
CLOCK
GEN
UCLK
PD
MCLK
Pentium is a trademark of Intel Corporation
PowerPC is a trademark of Motorola Corporation
9117-01 RevA 052297P
PRODUCT PREVIEW documents contain information on products in the formative or
design phase development. Charactersitic data and other specifications are design
goals. ICS reserves the right to change or discontinue these procucts without notice.

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