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ICS613

LOW PHASE NOISE CLOCK MULTIPLIER

Integrated Circuit Systems 

ICS613

LOW PHASE NOISE CLOCK MULTIPLIER

Description

The ICS613 is a low cost, low phase noise, high

performance clock synthesizer for any applications that

require low phase noise and low jitter. It is ICS’ lowest

phase noise multiplier. Using ICS’ patented analog and

digital Phase Locked Loop (PLL) techniques, the chip

can accept a 25MHz crystal or clock input, and

produces output clocks up to 157.5 MHz.

The chip has separate power supplies for the clock

outputs, allowing each output to be run at different

voltages. It also allows the core of the chip to operate at

3.3V, while the output clocks run at either 2.5V or 3.3V.

Features

• Packaged in 16 pin SOIC

• Available in Pb (lead) free package

• Uses a fundamental 25MHz crystal or clock

• Operating voltage of 3.3 V

• Separate output voltage supplies which can run at

2.5 V or 3.3 V

• Output clocks up to 157.5 MHz

• Low phase noise: -110 dBc/Hz at 10 kHz

• Low jitter of 36 ps (one sigma)

• Advanced, low power, sub-micron CMOS process

Block Diagram

X1/ICLK

Crystal or

clock input X2

Capacitors must be used

with a crystal input

Crystal

Oscillator

Reference

Divider

3

S2:SO

2 VDD

Phase

Comparator,

VCO

Charge Pump,

and Loop Filter

VCO

Divider

5 GND

VDDO1

Output

Divider

CLK1

CLK2

VDDO2

MDS 613 C

1

Revision 111204

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

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