Datasheet > 微控制器和处理器 > 时钟发生器> ASM3P1819NF-08-SR

ASM3P1819NF-08-SR

更新时间： 2024-11-24 22:26:11

品牌	Logo	应用领域
ALSC		晶体时钟发生器微控制器和处理器外围集成电路光电二极管
页数	文件大小	规格书
7页	353K
描述
Low Power Mobile VGA EMI Reduction IC

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August 2005

rev 0.2

ASM3P1819N

Low Power Mobile VGA EMI Reduction IC

Features

The ASM3P1819N reduces electromagnetic interference

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

reduction for all the down stream clocks and data

dependent signals. The ASM3P1819N 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 low EMI spread spectrum clock

and a non-spread Reference Clock of the input

frequency

Optimized for frequency range from 20MHz to

40MHz

Internal loop filter minimizes external components

and board space

The ASM3P1819N modulates the output of a single PLL in

order to “spread” the bandwidth of a synthesized clock,

thereby decreasing the peak amplitude of its harmonics.

This result in significantly lower system EMI compared to

the typical narrow band signal produced by oscillators and

most clock generators.

Down Spread Deviation: -1.25%

Low inherent Cycle-to-Cycle jitter

3.3V Operating Voltage

CMOS/TTL compatible inputs and outputs

Low power CMOS design

Lowering EMI by increasing a signal’s bandwidth is called

“spread spectrum clock generation”. The ASM3P1819N

uses the most efficient and optimized modulation profile

approved by the FCC and is implemented by using a

proprietary all digital method

Supports notebook VGA and other LCD timing

controller applications

Power Down function for mobile application

Products are available for industrial temperature

range.

Available in 8 pin SOIC and TSSOP Packages

Applications

The ASM3P1819N 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

system.

Functional Description

The ASM3P1819N is

versatile spread spectrum

frequency modulator designed specifically for a wide range

of input clock frequencies from 20 to 40MHz. The

ASM3P1819N can generate an EMI reduced clock from

crystal, ceramic resonator, or system clock.

PD#

VDD

Block Diagram

PLL

Modulation

XIN

Frequency

Divider

Crystal

Oscillator

Output

Loop

Filter

Phase

VCO

Divider

Detector

Feedback

Divider

XOUT

REF

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

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与ASM3P1819NF-08-SR相关器件

型号	品牌	获取价格	描述	数据表
ASM3P1819NF-08-ST	PULSECORE	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NF-08-ST	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NF-08-TR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NF-08-TR	PULSECORE	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NF-08-TT	PULSECORE	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NF-08-TT	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NG.08.SR	ONSEMI	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NG.08.ST	ONSEMI	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NG.08.TR	ONSEMI	获取价格	Low Power Mobile VGA EMI Reduction IC
ASM3P1819NG.08.TT	ONSEMI	获取价格	Low Power Mobile VGA EMI Reduction IC

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