ICST AV9120M-53, ICS9120M-53 Datasheet

Integrated
Circuit
Systems, Inc.

FeaturesGeneral Description

ICS9120-53

Frequency Generator for CD-ROM Systems

9120-53 Rev B 052497P

Block Diagram

• Generates 33.8688 MHz or 42.83 MHz decode clocks
plus the 12 and 24 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 ICS9120-53 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 ICS9120-53 operates over
the entire 3.0-5.5V range.

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)

12M 8.4672 X 52÷11÷2 20.0134
24M 8.4672 X52÷11 40.0268

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.

2

ICS9120-53

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 fo r Pin 2.
4 20M Output 12 MHz fixed output clock.
5 CLK1 Output 33.8/42.83 MHz selectable clock output.
6 40M Output 24 MHz fixedoutput clock.
7 FS Input Input selector for CLK1.
8 X2 Output Crystal output drive.