MK2745-21

DVD/MPEG Clock Source

MDS 2745-21 B

1

Revision 120400

Printed 12/5/00

Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com

The MK2745-21 is a low cost, low jitter, high

performance clock synthesizer for DVD and other

MPEG 2 based applications. Using analog Phase-

Locked Loop (PLL) techniques, the device accepts

a 27.00MHz fundamental mode crystal or clock

input to produce multiple output clocks including

the processor clock, the processor clock divided by

two, 27 MHz, 24.576 MHz, and a selectable

audio clock. The audio clocks are frequency

locked to the 27.00MHz input using our patented

zero ppm error techniques, allowing audio and

video to track exactly, thereby eliminating the

need for large buffer memory.

MicroClock manufactures the largest variety of

DVD, Set-Top Box, and multimedia clock

synthesizers for all applications. Consult

MicroClock to eliminate crystals and oscillators

from your board.

Block Diagram

Description

Features

• Packaged in 16 pin narrow (150 mil) SOIC

• Ideal for LuxSonor’s DVD solutions

• 3.3V upgrade to MK2744

• Patented zero ppm audio clock error for 256X and

384X sampling rates

• Selectable audio sampling frequencies support

32 kHz, 44.1 kHz, and 48 kHz in most DACs

• 27.00 MHz fundamental crystal or clock input

• Eight selectable processor frequencies

• Fixed clocks of 27 and 24.576 MHz

• Zero ppm error in all clocks

• Full CMOS outputs with 25mA output drive

capability at TTL levels

• Advanced, low power, sub-micron CMOS process

• 3.0V to 5.5V operating voltage

• See also the MK2712 for NTSC/PAL clocks

Clock

Buffer/

Crystal

Oscillator

VDD

GND

Clock Synthesis

and Control

Circuitry

Processor Clock

27.00 MHz

clock or

crystal

Output

Buffer

Output

Buffer

Audio Clock

27 MHz

2

2

Output

Buffer

24.576 MHz

AS2:0

Output

Buffer

3

PS1:0

2

X1

X2

PCLK/2

Output

Buffer

÷ 2