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P2681A-08SR

更新时间： 2024-11-17 22:23:47

品牌	Logo	应用领域
ALSC		晶体时钟发生器微控制器和处理器外围集成电路光电二极管
页数	文件大小	规格书
10页	472K
描述
General Purpose EMI Reduction IC

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P2681A-08SR 数据手册

October 2003

rev D

P2681A

General Purpose EMI Reduction IC

Features

system cost savings by reducing the number of circuit

board layers and shielding that are traditionally

required to pass EMI regulations.

FCC approved method of EMI attenuation

Provides up to 15 dB of EMI suppression

Generates a 1 X or ½ X low EMI spread

spectrum clock of the input frequency

Output frequency from 6MHz to 20MHz

Digital spread selections

The P2681A uses the most efficient and optimized

modulation profile approved by the FCC.

Spreading ranges from +/-0.4% to +/-5.0%

Ultra low cycle-to-cycle jitter

The P2681A 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”.

Zero-cycle slip

3.3V and 5.0V operating voltage range

10 mA output drives

TTL or CMOS compatible outputs

Ultra-low power CMOS design

Available in 8 pin SOIC and TSSOP

Product Description

The P2681A is

versatile spread spectrum

frequency modulator designed specifically for digital

camera and other digital video and imaging

applications. The P2681A reduces electromagnetic

interference (EMI) at the clock source, which

provides system wide reduction of EMI of all clock

dependent signals. The P2681A allows significant

Applications

The P2681A is targeted towards MFP, xDSL, fax

modem, set-top box, USB controller, DSC, and

embedded systems.

Block Diagram

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.

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