May 2008

PCS3P2189A

rev 0.2

Notice: The information in this document is subject to change without notice.

PulseCore Semiconductor Corporation

1715 S. Bascom Ave Suite 200, Campbell, CA 95008

• Tel: 408-879-9077 • Fax: 408-879-9018

www.pulsecoresemi.com

Spread Spectrum Clock Generator

Features

•

Generates a 4X low EMI spread spectrum clock of

the input frequency.

•

Input frequency: 10MHz - 25MHz

•

Output frequency: 40MHz - 100MHz

•

Internal loop filter minimizes external components

and board space.

•

Selectable Centre Spread frequency deviation:

±0.5%, ± 1.0%, ± 1.5%, ± 2.0%

•

Supply Voltage :3.3V ± 0.3V

•

Commercial and Industrial temperature range

•

8-pin TSSOP Package

•

Low power CMOS process

Product Description

PCS3P2189A is a versatile spread spectrum frequency

modulator that generates a low EMI 4x clock at the

output. PCS3P2189A offers four

selectable centre

spread options of ±0.5%,±1.0%,±1.5%,±2.0%,(Refer

Spread

Deviation

Selection

Tabnle).

PCS3P2189A

reduces electromagnetic interference (EMI) at the clock

source, allowing system wide reduction of EMI of all

clock

dependent signals. The PCS3P2189A allows

significant system cost savings by reducing the number

of circuit board layers, ferrite beads, and shielding that

are traditionally required to pass EMI regulations.

PCS3P2189A has spread spectrum ON/OFF option.

The PCS3P2189A uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all digital method.

Application

PCS3P2189A is targetted for LCD panel application

Block Diagram

ModOUT

CLKIN / XIN

VSS

Frequency

Divider

Feedback

Divider

Modulation

Phase

Detector

Loop

Filter

VCO

Output

Divider

PLL

VDD

XOUT

Crystal

Oscillator

S0

SSON

S1