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ICS650-47

Spread Spectrum Clock Synthesizer

Integrated Circuit Systems 

P R E L I M I N A RY I N F O R M AT I O N

ICS650-47

Spread Spectrum Clock Synthesizer

Description

The ICS650-47 is a spread spectrum clock synthesizer

intended for video projector applications. It generates

an EMI optimized 50 MHz clock signal through the use

of Spread Spectrum techniques from a 25 MHz crystal

or clock input. For the 50 MHz output, the modulation

rate is 50 kHz.

Features

• Packaged in 16-pin TSSOP (173 mil)

• Supply voltages: VDD = 3.3 V, VDDO = 2.5 V

• Peak-to-peak jitter: ±125 ps typ

• Output duty cycle 45/55% (worst case)

• Guarantees +85°C operational condition

• 25 MHz crystal or reference clock input

• Zero (0) ppm frequency error on all output clocks

• Advanced, low-power CMOS process

• Industrial temperature range (0 to +85°C)

Block Diagram

25 MHz crystal

or clock input

X1/CLKIN

X2

External capacitors are

required with a crystal

input.

FS3:0

SS_EN

Crystal

OSC

VDD

3

VDDO

PLL with

Spread

50M

Spectrum

Control

Logic

2

GND

PDTS

MDS 650-47 B

1

Revision 082305

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

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