Integrated

Circuit

Systems, Inc.

Features

General 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

(M Hz)

FS

D ivisor

C LK 1

8.4672

0

X12÷3

33.8688

86.4672

1

X61÷6

42.83

Clock

X1, X2

(M Hz)

Divisor

O utput

(M Hz)

12M

8.4672

X52÷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.