Datasheet > ASM3P2853A

ASM3P2853A

更新时间： 2024-11-24 22:35:47

品牌	Logo	应用领域
ALSC		/
页数	文件大小	规格书
8页	2705K
描述
Peak EMI Reducing Solution

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数据手册

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ASM3P2853A 数据手册

December 2004

rev 0.7

ASM3P2853A

Peak EMI Reducing Solution

Features

shielding that are required to pass EMI regulations. The

ASM3P2853A modulates the output of PLL in order to

spread the bandwidth of a synthesized clock, thereby

decreasing 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 clock generators. Lowering EMI by increasing a

signal’s bandwidth is called spread spectrum clock

generation.

ꢀ

Generates an EMI optimized clock signal at

output.

ꢀ

Input frequency: 25 MHz.

Frequency outputs:

USB Clock (48 MHz unmodulated)

50 MHz (modulated), ±1% centre spread

ꢀ

Modulation rate: 39 KHz.

Spread Spectrum ON/OFF control

Supply voltage range 2.5V ± 5%.

Available in 8-pin SOIC package.

Commercial Temperature range.

Applications

ASM3P2853A is targeted towards EMI management for

high speed digital applications such as PC peripheral

devices, consumer electronics and embedded controller

systems.

Product Description

The ASM3P2853A is

a versatile spread spectrum

frequency modulator. The ASM3P2853A reduces

electromagnetic interference (EMI) at the clock source.

The ASM3P2853A allows significant system cost savings

by reducing the number of circuit board layers and

Block Diagram

PWDNB

XIN

USB Clock

(48 MHz

Unmodulated)

Crystal

Oscillator

PLL1

PLL2

XOUT

50 MHz

Modulated

SSONB

V_SS

Alliance Semiconductor

2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • www.alsc.com

12 3 4 5 6 7 8

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