Datasheet > ASM3P2185B-ST

ASM3P2185B-ST

更新时间： 2024-11-11 20:10:51

品牌	Logo	应用领域
ALSC		时钟光电二极管外围集成电路晶体
页数	文件大小	规格书
7页	387K
描述
Clock Generator, 50MHz, CMOS, PDSO8, SOIC-8

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中文翻译

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数据手册

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ASM3P2185B-ST 数据手册

November 2003

rev 1.1

ASM3P2185B

EMI Reduction IC

Features

The ASM3P2185B reduces electromagnetic interference

(EMI) at the clock source, allowing system wide EMI

reduction for all the down stream clocks and data

dependent signals. The ASM3P2185B allows significant

system cost savings by reducing the number of circuit

board layers, ferrite beads, shielding, and other passive

components that are traditionally required to pass EMI

regulations.

FCC approved method of EMI attenuation.

Provides up to 15dB EMI reduction.

Generates a 1X low EMI spread spectrum clock of

the input frequency.

Input frequency range: 25MHz to 50 MHz.

Internal loop filter minimizes external components

and board space.

Down Spread and Center Spread.

2 spread frequency deviation selections: -1.25%

and ± 0.8%.

The ASM3P2185B uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all digital method.

Low inherent cycle-to-cycle jitter.

3.3V operating voltage range.

TTL or CMOS compatible inputs and outputs.

Low power CMOS design.

Supports notebook VGA and other LCD timing

controller applications.

The ASM3P2185B 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’.

Products are available for industrial temperature

range.

Available in 8-pin SOIC and TSSOP.

Product Description

The ASM3P2185B is

frequency modulator designed specifically for a wide

range of input clock frequencies from 25MHz to 50MHz.

The ASM3P2185B can generate an EMI reduced clock

from an OSC or a system generated clock.

a versatile spread spectrum

Applications

The ASM3P2185B is targeted towards EMI management

for memory and LVDS interfaces in mobile graphic

chipsets and high-speed digital applications such as PC

peripheral devices, consumer electronics, and embedded

controller systems.

Block Diagram

SS%

VDD

PLL

Modulation

XIN

Crystal

Frequenc

Oscillator

Output

Phase

Loop

Filter

VCO

XOUT

Divider

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.

12 3 4 5 6 7

中文翻译

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与ASM3P2185B-ST相关器件

型号	品牌	获取价格	描述	数据表
ASM3P2185B-TR	ALSC	获取价格	Clock Generator, 50MHz, CMOS, PDSO8, TSSOP-8
ASM3P2185B-TT	ALSC	获取价格	Clock Generator, 50MHz, CMOS, PDSO8, TSSOP-8
ASM3P2187A	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187A_1	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187AG-08TR	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187AG-08TT	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187B	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187BG-08TR	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2187BG-08TT	PULSECORE	获取价格	Spread Spectrum Clock Generator for Mobile Applications
ASM3P2190A	ALSC	获取价格	Peak Reducing EMI Solution

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