© Semiconductor Components Industries, LLC, 2011

August, 2011 − Rev. P3

1

Publication Order Number:

ASM3P2182A/D

ASM3P2182A

Product Preview

LCD Panel EMI Reduction IC

Description

The ASM3P2182A is a versatile spread spectrum frequency

modulator designed specifically for a wide range of input clock

frequencies from 25 MHz to 210 MHz. (Refer to Input Frequency and

Modulation Rate Table). The ASM3P2182A can generate an EMI

reduced clock from an OSC or a system generated clock. The

ASM3P2182A offers a Center Spread clock and with a percentage

deviation from

± 0.13% or ± 1.24%.

The ASM3P2182A reduces electromagnetic interference (EMI) at

the clock source, allowing system wide reduction of EMI of down

stream clock and data dependent signals. The ASM3P2182A allows

significant system cost savings by reducing the number of circuit

board layers ferrite beads, shielding and other passive components that

are traditionally required to pass EMI regulations.

The ASM3P2182A uses the most efficient and optimized

modulation profile approved by the FCC and is implemented in a

proprietary all digital method.

The ASM3P2182A modulates the output of a single PLL in order to

“spread” the bandwidth of a synthesized clock, and more importantly,

decreases the peak amplitudes of its harmonics. This results in

significantly lower system EMI compared to the typical narrow band

signal produced by oscillators and most frequency generators.

Lowering EMI by increasing a signal’s bandwidth is called ‘spread

spectrum clock generation.’

Applications

The ASM3P2182A is targeted towards EMI management for

memory and LVDS interfaces in mobile graphic chipsets and

high−speed digital applications such as PC peripheral devices,

consumer electronics, and embedded controller systems.

Features

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

http://onsemi.com

SOIC−8

S SUFFIX

CASE 751BD

PIN CONFIGURATION

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 6 of this data sheet.

ORDERING INFORMATION

FS1

FS0

VDD

ModOUT

GND

S1

CLKIN

1

S0

TSSOP−8

T SUFFIX

CASE 948AL