Datasheet > I2041AF-8TR

I2041AF-8TR

更新时间： 2023-03-15 00:00:00

品牌	Logo	应用领域
PULSECORE		光电二极管
页数	文件大小	规格书
9页	176K
描述
Clock Generator, 40.4MHz, CMOS, PDSO8, 4.40 MM, ROHS COMPLIANT, TSSOP-8

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I2041AF-8TR 数据手册

January 2006

rev 0.1

P2041A

Versatile EMI Reduction IC

Features

which provides system wide reduction of EMI of all clock

dependent signals. The P2041A allows significant 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 20dB of EMI suppression

Generates a low EMI spread spectrum clock of the

input frequency

Optimized for 25MHz to 60MHz input frequency

range

Internal loop filter minimizes external components

and board space

The P2041A uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all-digital method.

4 selectable spread ranges

SSON control pin for spread spectrum enable and

disable options

Low Cycle-to-cycle jitter

3.3V or 5.0V operating voltage

Low power CMOS design

The P2041A 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 result 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”.

Available in 8 pin SOIC and TSSOP Packages

Product Description

Applications

The P2041A is a selectable spread spectrum frequency

modulator designed specifically for PC peripheral and

embedded controller markets. The P2041A reduces

electromagnetic interference (EMI) at the clock source

The P2041A is targeted towards the embedded controller

market and PC peripheral markets including scanners,

MFP’s, printers, PDA, IA , and GPS devices.

Block Diagram

VDD

SSON

SR1

SR0

PLL

Modulation

XIN

Frequency

Divider

Crystal

Oscillator

XOUT

Output

Divider

Phase

Loop

Filter

VCO

Detector

Feedback

Divider

ModOUT

VSS

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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