MK2722
Sigma Designs Clock Source
Description
The MK2722 is a low cost, low jitter, high performance
clock synthesizer designed for Sigma Designs’ MPEG
decoder systems. Using analog Phase-Locked Loop
(PLL) techniques, the device accepts a 27 MHz crystal
or clock input to produce multiple output clocks. The
power down pin turns off the device, drawing less than
100 µA.
ICS offers a wide variety of clock synthesizers for
desktop and portable computers, and multimedia
systems. Consult ICS to eliminate crystals and
oscillators from your board.
Features
• Packaged in 16 pin narrow (150 mil) SOIC
• Uses 27 MHz crystal or clock input
• Zero ppm synthesis error in all clocks (audio clocks
exactly track 27 MHz video clock)
• Audio clock supports 32, 44.1, and 48kHz
sampling rates at 256X and 384X
• Power down turns off chip
• Low jitter
• Total of four output clocks
• 25 mA output drive capability at TTL levels
• 5V±10% supply voltage (contact ICS for
3.3V operation)
• Advanced, low power, sub-micron CMOS process
Block Diagram
VDD
3
GND
2
PD
AS1:0
2
Clock
Synthesis and
Control Circuitry
Output
Buffer
Output
Buffer
Output
Buffer
ACLK
2
BS1:0
BCLK
BCLK/2
27 MHz crystal
or clock
X1
Crystal
Oscillator
X2
Output
Buffer
27.0000 MHz
MDS 2722 B
1
Revision 020802
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295 9800tel • www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
