ICST AV9120M-52, ICS9120M-52 Datasheet
Integrated
Circuit
Systems, Inc.
FeaturesGeneral Description
ICS9120-52
Frequency Generator for CD-ROM Systems
9120-52 Rev B 052497P
Block Diagram
• Generates 33.8688 MHz or 42.83 MHz decode clocks
plus the 20 and 40 MHz fixed clocks
• Single 8.4672 MHz crystal or system clock reference
• 200ps one sigma jitter maintains 16-bit performance
• Output rise/fall times less than 2.0ns
• On-chip loop filter components
• 3.3V -5V supply range
• 8-pin, 150-mil SOIC
Applications
• Specifically designed to support the high performance
requirements of CD-ROM drive systems
The ICS9120-52 is a high performance frequency generator
designed to support digital compact disk drive systems. It
offers all clock frequencies required for the servo and
decoder sections of these devices. These frequencies are
synthesized from a single 16.9344 MHz on-chip oscillator.
High accuracy, low jitter PLLs meet the 150 ppm frequency
tolerance required by these systems. Fast output clock
edge rates minimize board induced jitter.
Unlike competitive devices, the ICS9120-52 operates over
the entire 3.0-5.5V range.
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.
Pin Configuration
8-Pin SOIC
Functionality
X1, X2
(MHz)
FS Divisor CLK 1
8.4672 0 X12÷3 33.8688
86.4672 1 X61÷6 42.83
Clock
X1, X2
(MHz)
Divisor
Output
(MHz)
20M 8.4672 X 52÷11÷2 20.0134
40M 8.4672 X52÷11 40.0268
2
ICS9120-52
Pin Descriptions
PIN
NUMBER
PIN
NAME
TYPE DESCRIPTION
1 X1 Input Crystal or external clock source. Has feedback bias for crystal.
2 VDD Power +Power supply input.
3 GND Power Ground return for Pin 2.
4 20M Output 20 MHz fixed output clock.
5 CLK1 Output 33.8/42.83 MHz selectable clock output.
6 40M Output 40 MHz fixedoutput clock.
7 FS Input Input selector for CLK1.
8 X2 Output Crystal output drive.
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