Datasheet > ASM3P5821AS

ASM3P5821AS

更新时间： 2024-11-24 21:20:51

品牌	Logo	应用领域
ALSC		/
页数	文件大小	规格书
7页	135K
描述
Clock Generator

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中文翻译

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数据手册

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ASM3P5821AS 数据手册

October 2003

rev 1.0

ASM3P5821A

The ASM3P5821A reduces electromagnetic interference

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

of EMI of down stream clock and data dependent

signals. The ASM3P5821A 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.

Features

ꢀ

FCC approved method of EMI attenuation.

Generates a 1X low EMI spread spectrum clock of

the input frequency.

ꢀ

Input frequency range: 20MHz –34MHz.

Internal loop filter minimizes external components

and board space.

ꢀ

Frequency deviation: -1.5%

The ASM3P5821A 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.

TTL or CMOS compatible inputs and outputs.

Ultra-low power CMOS design.

The ASM3P5821A 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’.

TBD mA @ 3.3V, 25MHz

TBD mA @ 3.3V, 31MHz

ꢀ

Pinout compatible with Cypress CY25811.

Products are available for industrial temperature

range.

ꢀ

Available in 8-pin SOIC and TSSOP.

Product Description

The ASM3P5821A is

a versatile spread spectrum

frequency modulator designed specifically for input clock

frequencies in the range of 20MHz – 34MHz. The

ASM3P5821A can generate an EMI reduced clock from

crystal, ceramic resonator, or system clock. The

ASM3P5821A offers a percentage deviation of –1.5%.

Applications

The ASM3P5821A is targeted towards EMI management

for high speed digital applications such as PC peripheral

devices, consumer electronics and embedded controller

systems.

VDD

Block Diagram

PLL

Modulation

XIN

Crystal

Oscillator

Frequency

Divider

Output

Divider

Phase

Detector

Loop

Filter

VCO

XOUT

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ASM3P5821AS相关器件

型号	品牌	获取价格	描述	数据表
ASM3P5821A-SR	ALSC	获取价格	Clock Generator, 34MHz, CMOS, PDSO8, SOIC-8
ASM3P5821A-ST	ALSC	获取价格	Clock Generator, 34MHz, CMOS, PDSO8, SOIC-8
ASM3P5821AT	ALSC	获取价格	Clock Generator
ASM3P5821A-TR	ALSC	获取价格	Clock Generator, 34MHz, CMOS, PDSO8, TSSOP-8
ASM3P5821A-TT	ALSC	获取价格	Clock Generator, 34MHz, CMOS, PDSO8, TSSOP-8
ASM3P622S00A	PULSECORE	获取价格	Low Frequency Timing-Safe™ Peak EMI reduction
ASM3P622S00AF-08-SR	PULSECORE	获取价格	Low Frequency Timing-Safe™ Peak EMI reduction
ASM3P622S00AF-08-ST	PULSECORE	获取价格	Low Frequency Timing-Safe™ Peak EMI reduction
ASM3P622S00AF-08-TR	PULSECORE	获取价格	Low Frequency Timing-Safe™ Peak EMI reduction
ASM3P622S00AF-08-TT	PULSECORE	获取价格	Low Frequency Timing-Safe™ Peak EMI reduction

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