ASM3P2856A

November 2006

ASM3P2856B

rev0.1

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

Custom Clock generator for LCD Projector

Features

•

Custom Clock Generator for LCD Projector

•

Generates EMI optimized clock signals for

LCD Projector system

•

Uses an inexpensive 14.7456 MHz crystal for

generating the required Outputs

•

Frequency outputs:

•

CLK1 : 27.002MHz

(± 20 ppm)

•

CLK2 : 14.7456MHz (Zero ppm)

•

CLK3 : 65MHz (± 15 ppm)

•

CLK4,CLK5 : 65MHz (±15 ppm) Spread

Spectrum Clock

•

ASM3P2856A: +/- 1% centre spread

ASM3P2856B: selectable +/-1.0% & +/-1.5%

Centre Spread option

•

Supply voltage range 3.3V ± 0.3V.

•

Available in 16 Pin TSSOP

•

Available in Commercial Temperature range

Product Description

ASM3P2856A/B generate the required four custom clock

frequencies for the LCD Projector. An inexpensive

14.7456MHz crystal is used to generate a 14.7456MHz

used by the microcomputer, a 27MHz used by Video, a

non-spread 65MHz, and a centre spread 65MHz clock used

by the LCD projector system. The spread spectrum clock

has +/- 0.5% or +/- 1% spread options.

The spread

spectrum clock of ASM3P2856A/B reduces electromagnetic

interference (EMI) at the clock source. This allows

significant system cost savings by reducing the number of

circuit board layers and shielding that are required to pass

EMI regulations.

Applications

ASM3P2856A/B is targeted for use in LCD Projectors.

Block Diagram

GND

CLK4

Crystal

Oscillator

XIN

XOUT

CLK1

PLL

CLK2

CLK3

CLK5

SSON SS%