© Semiconductor Components Industries, LLC, 2011

August, 2011 − Rev. 3

1

Publication Order Number:

ASM3P2762A/D

ASM3P2762A

Low Power Peak EMI

Reducing Solution

Description

The ASM3P2762A is a versatile spread spectrum frequency

modulator designed specifically for a wide range of clock frequencies.

The ASM3P2762A reduces electromagnetic interference (EMI) at the

clock source, allowing system wide reduction of EMI of all clock

dependent signals. The ASM3P2762A 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.

The ASM3P2762A uses the most efficient and optimized

modulation profile approved by the FCC and is implemented by using

a proprietary all digital method.

The ASM3P2762A 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 ASM3P2762A is targeted towards all portable devices with

very low power requirements like MP3 players and digital still

cameras.

Features

6 MHz to 12 MHz for 2.5 V

6 MHz to 13 MHz for 3.3 V

Frequency

Packages

Compliant

http://onsemi.com

TSOT−6

O SUFFIX

CASE 419AF

PIN CONFIGURATIONS

6−Pin TSOT−23 Package

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION

ModOUT

XOUT

PD

1

XIN / CLKIN

Supply Voltages

200 pS (Max)

Cycle−to−Cycle Jitter

45/55%

Output Duty Cycle

Modulation Rate Equation

−1.25% (Typ)

@ 10 MHz

Frequency Deviation

Description

Specification

KEY SPECIFICATIONS

SOIC−8

S SUFFIX

CASE 751BD

TSSOP−8

T SUFFIX

CASE 948AL

8−Pin SOIC and TSSOP Packages

(Top View)

1

ModOUT

XOUT

PD

XIN / CLKIN

NC

NC