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ICS651-03

VOIP Clock Source

Integrated Circuit Systems 

ICS651-03

VOIP Clock Source

Description

The ICS651-03 is a low cost frequency generator

designed to support voice-over-internet protocol

(VOIP) applications. Using analog/digital

Phase-Locked Loop (PLL) techniques, the device uses

a standard fundamental mode, inexpensive crystal

input to produce four output clocks supporting DSP,

video encoder, and memory functions. To form a

complete VOIP clocking solution use the ICS651-02

companion device.

The device also has a power down feature that

tri-states the clock outputs and turns off the PLL when

the PDTS pin is taken low.

Features

• Packaged in 16-pin TSSOP

• Replaces multiple crystals and oscillators

• Input crystal or clock frequency of 27 MHz

• Fixed reference output frequency of 80 MHz

• Fixed output frequency of 48 MHz

• Fixed output frequency of 25 MHz

• Reference output frequency of 27 MHz

• Duty cycle of 40/60

• Operating voltage of 3.3 V

• Advanced, low power CMOS process

Block Diagram

VDD

6

PLL1

80M

X1

27 MHz

crystal

input

X2

Crystal

Oscillator/

Clock

Buffer

External capacitors

may be required.

PLL2

3

GND

48M

25M

REF

PDTS (all outputs and PLLs)

MDS 651-03 A

1

Revision 112603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201● www.icst.com

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