November 2003

P2010A

rev F

Alliance Semiconductor

2575, Augustine Drive

• Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com

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

Low Frequency EMI Reduction IC

Features

FCC approved method of EMI attenuation

Provides up to 20 dB of EMI suppression

Generates a low EMI spread spectrum clock

of the input frequency

Optimized for 10 MHz to 35MHz input

frequency range

Internal loop filter minimizes external

components and board space

4 selectable spread ranges

SSON control pin for spread spectrum

enable and disable options

Characterizes to work with EMI-Lator

®

, EMC

simulation program.

Low cycle-to-cycle jitter

Wide operating range (3V to 5V)

16 mA output drives

TTL or CMOS compatible outputs

Low power CMOS design

Available in 8 pin SOIC and TSSOP

Product Description

The P2010 is a selectable spread spectrum

frequency modulator designed specifically for PC

peripheral and embedded controller markets. The

P2010 reduces electromagnetic interference (EMI) at

the clock source which provides system wide

reduction of EMI of all clock dependent signals. The

P2010 allows significant system cost savings by

reducing the number of circuit board layers and

shielding that are traditionally required to pass EMI

regulations.

The P2010 uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all-digital method.

The P2010 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 P2010 is targeted towards the embedded

controller market and PC peripheral markets

including scanners, facsimile, MFP’s, printers, PDA,

IA, and GPS devices.

Block Diagram