P1819AF-08SR

更新时间： 2025-07-23 22:34:51

品牌	Logo	应用领域
ALSC		电脑
页数	文件大小	规格书
9页	370K
描述
Notebook LCD Panel EMI Reduction IC

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中文翻译

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数据手册

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P1819AF-08SR 数据手册

November 2005

rev 1.7

P1819

Notebook LCD Panel EMI Reduction IC

Features

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.

The P1819 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’.

Selectable spread options: Down and Center.

Low Inherent Cycle-to-Cycle jitter.

Eight spread % selections: ±0.625% to –3.5%.

3.3V ± 0.3V Operating Voltage range.

Low power CMOS design.

The P1819 uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented in a proprietary all digital method.

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.

Applications

Product Description

The P1819 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 P1819 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 P1819 reduces electromagnetic

interference (EMI) at the clock source, allowing system

wide reduction of EMI of down stream clock and data

dependent signals. The P1819 allows significant system

cost savings by reducing the number of circuit board layers

VDD

SRS

D_C/NC PD#

Block Diagram

PLL

Modulation

XIN/CLKIN

Frequenc

Crystal

Oscillator

Output

Divider

Phase

Loop

Filter

VCO

Detector

XOUT

REF

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...9

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与P1819AF-08SR相关器件

型号	品牌	获取价格	描述	数据表
P1819AF-08ST	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AF-08TR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AF-08TT	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AG-08SR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AG-08ST	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AG-08TR	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819AG-08TT	ALSC	获取价格	Notebook LCD Panel EMI Reduction IC
P1819B	ONSEMI	获取价格	Notebook LCD Panel EMI Reduction IC
P1819B-08SR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
P1819B-08ST	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC

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