DATASHEET

SPREAD SPECTRUM CLOCK SYNTHESIZER

ICS650-41

IDT™ / ICS™ SPREAD SPECTRUM CLOCK SYNTHESIZER

1

ICS650-41

REV G 102709

Description

The ICS650-41 is a spread spectrum clock synthesizer

intended for video projector applications. It generates an

EMI optimized 50 MHz clock signal (EMI peak reduction of

7 to 14 dB on 3rd through 19th harmonics) 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.

In addition to the EMI optimized clock signal, the device

generates a 48 MHz clock for USB.

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

Block Diagram

Crystal

OSC

GND

2

3

VDD

PLL2

Control

Logic

50M

X2

25 MHz crystal

or clock input

External capacitors are

required with a crystal

input.

X1/CLKIN

48M

FS3:0

VDDO

PDTS

PLL1 with

Spread

Spectrum

SS_EN