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ASM3P2531A-08ST

更新时间： 2024-11-10 22:13:15

品牌	Logo	应用领域
ALSC		晶体外围集成电路光电二极管时钟
页数	文件大小	规格书
8页	190K
描述
Low Frequency EMI Reduction

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中文翻译

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数据手册

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ASM3P2531A-08ST 数据手册

November 2003

rev 1.0

ASM3P2531A

Features

dependent signals. It allows significant system cost

ꢀ

FCC approved method of EMI attenuation.

savings by reducing the number of circuit board layers

and shielding traditionally required to pass EMI

regulations.

Generates a low EMI spread spectrum of the

input clock frequency.

ꢀ

Optimized for input frequency range between

35MHz – 55MHz.

The ASM3P2531A modulates the output of a single 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.

Internal loop filter minimizes external

components and board space.

ꢀ

Frequency Deviation: ±1.65%.

Low inherent cycle-to-cycle jitter.

3.3 V or 5 V operating voltage.

CMOS/TTL compatible inputs and outputs.

Ultra low power CMOS design: 5.50 mA @3.3 V.

Supports notebook VGA and other LCD timing

controller applications.

The ASM3P2531A uses the most efficient and optimized

modulation profile approved by the FCC and is

ꢀ

Available in 8-pin SOIC and TSSOP.

implemented by using a proprietary all-digital method.

Product Description

The ASM3P2531A is a versatile spread spectrum

frequency modulator designed specifically for a wide

range of clock frequencies. It reduces electromagnetic

interference (EMI) at the clock source allowing system-

wide reduction of EMI of downstream clock and data

Applications

The ASM3P2531A is targeted toward the notebook VGA

chip and other displays using an LVDS interface, PC

peripheral devices, and embedded systems

Block Diagram

STOP

VDD

PLL

Modulation

CLKIN

Crystal

Oscillator

Frequency

Divider

Output

Divider

Phase

Detector

Loop

Filter

VCO

Feedback

Divider

MODOUT

VSS

Low Frequency EMI Reduction

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Notice: The information in this document is subject to change without notice.

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与ASM3P2531A-08ST相关器件

型号	品牌	获取价格	描述	数据表
ASM3P2531A-08TR	ALSC	获取价格	Low Frequency EMI Reduction
ASM3P2531A-08TR	PULSECORE	获取价格	Clock Generator, 55MHz, CMOS, PDSO8, 4.40 MM, TSSOP-8
ASM3P2531A-08TT	ALSC	获取价格	Low Frequency EMI Reduction
ASM3P2531A-08TT	PULSECORE	获取价格	Clock Generator, 55MHz, CMOS, PDSO8, 4.40 MM, TSSOP-8
ASM3P2531AF-08SR	PULSECORE	获取价格	Low Frequency EMI Reduction
ASM3P2531AF-08ST	PULSECORE	获取价格	Low Frequency EMI Reduction
ASM3P2531AF-08TR	PULSECORE	获取价格	Low Frequency EMI Reduction
ASM3P2531AF-08TT	PULSECORE	获取价格	Low Frequency EMI Reduction
ASM3P2531AG-08SR	PULSECORE	获取价格	Low Frequency EMI Reduction
ASM3P2531AG-08ST	PULSECORE	获取价格	Low Frequency EMI Reduction