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ASM3P18S19BF-08ST

更新时间： 2024-11-24 22:25:43

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电脑
页数	文件大小	规格书
7页	198K
描述
Notebook LCD Panel EMI Reduction IC

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August 2005

rev 2.1

ASM3P18S19B

Notebook LCD Panel EMI Reduction IC

Features

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 low EMI Spread Spectrum clock and a

non-spread reference clock of the input frequency.

Optimized for Frequency range from 20 to 40MHz.

Internal loop filter minimizes external components and

board space.

Low Inherent Cycle-to-Cycle jitter.

Two spread % selections: -1.25% to -1.75%.

3.3V Operating Voltage.

Low power CMOS design.

Supports notebook VGA and other LCD timing

controller applications.

Power Down function for mobile application.

Available in Commercial temperature range.

Available in 8-pin SOIC and TSSOP Packages.

RoHS Compliant

The ASM3P18S19B 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’.

The ASM3P18S19B uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all digital method.

Applications

Product Description

The ASM3P18S19B 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.

The ASM3P18S19B is a Versatile Spread Spectrum

Frequency Modulator designed specifically for input clock

frequencies from 20 to 40MHz. (Refer Input Frequency and

Modulation Rate Table). The ASM3P18S19B reduces

electromagnetic interference (EMI) at the clock source,

allowing system wide reduction of EMI of down stream

clock and data dependent signals. The ASM3P18S19B

Block Diagram

VDD

SRS

PD#

PLL

Modulation

XIN/CLKIN

XOUT

Crystal

Frequency

Divider

Oscillator

Output

Phase

Loop

Filter

VCO

Divider

Detector

Feedback

Divider

ModOUT

REF

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ASM3P18S19BF-08ST相关器件

型号	品牌	获取价格	描述	数据表
ASM3P18S19BF-08TR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BF-08TR	PULSECORE	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BF-08TT	PULSECORE	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BF-08TT	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08SR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08SR	PULSECORE	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08ST	PULSECORE	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08ST	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08TR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
ASM3P18S19BG-08TR	PULSECORE	获取价格	Notebook LCD Panel EMI Reduction IC

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