October 2003

P2160

rev E

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.

High Frequency LCD Panel 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

40 MHz to 166 MHz input frequency range

Optimized for SVGA, XGA and high resolution

SXGA and UXGA LCD panels

Internal

loop

filter

minimizes

external

components and board space

2 selectable spreading options

SSON# control pin for spread spectrum enable

and disable options

2 selectable modulation rates

Low cycle-to-cycle jitter

3.3V operating range 16 mA output drives

16 mA output drives

TTL or CMOS compatible outputs

Low power CMOS design

Supports most mobile graphic accelerator

specifications

Available in 8 pin SOIC and TSSOP

Product Description

The P2160 is a selectable spread spectrum

frequency modulator designed 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” reducing the number of

circuit board layers and shielding that are traditionally

required to pass EMI regulations.

The P2160 uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all-digital method.

The P2160 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 P2160 is targeted towards digital flat panel

applications for Notebook PCs, Palm-size PCs, Office

Automation Equipments, and LCD Monitors, Digital

Still Cameras and GPS Devices.

Block Diagram