ICS9117-01 Ver la hoja de datos (PDF) - Integrated Circuit Systems
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ICS9117-01 Datasheet PDF : 5 Pages
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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 ±80
ppm frequency accuracy using a standard AT crystal with
external load capacitors (typically 33pF ±5% for an 18pF
series load crystal). Achieving ±80ppm over four years
requires the crystal to have 20 ppm initial accuracy, ±20 ppm
temperature and ±5 ppm/year aging coefficients.
Features
• Generates the 14.7456 MHz microcontroller, 40.320
MHz datadump and 1.84320 UART clocks
• Less than ±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
XTAL
X1 OSC
÷8
PLL
PD
CLOCK
GEN
PCLK
UCLK
MCLK
9117-01 RevA 052297P
Pentium is a trademark of Intel Corporation
PowerPC is a trademark of Motorola Corporation
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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