Datasheet > I1820F-08ST

I1820F-08ST

更新时间： 2024-11-06 22:41:11

品牌	Logo	应用领域
ALSC		/
页数	文件大小	规格书
8页	61K
描述
Low Power Mobile VGA EMI Reduction IC

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中文翻译

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数据手册

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I1820F-08ST 数据手册

Production

March 2003

P1818/19/20/21/22

Low Power Mobile VGA EMI Reduction IC

Features

•

FCC approved method of EMI attenuation

•

Selectable spread options: Down Spread and Cen-

ter Spread

Low inherent cycle-to-cycle jitter

Eight spread % selections: +/-0.625% to –3.5%

3.3V operating voltage

CMOS/TTL compatible inputs and outputs

Low power CMOS design

Supports notebook VGA and other LCD timing

controller applications

Provides up to 15 dB EMI reduction

Generates a low EMI spread spectrum clock and a

non-spread reference clock of the input frequency

Optimized for frequency range from 10 MHz to 160

MHz

P1818: 10 to 20 MHz

P1819: 20 to 40 MHz

P1820: 40 to 80 MHz

•

P1821: 10 to 40 MHz

P1822: 80 to 160 MHz

Internal loop filter minimizes external components

and board space

•

Power down function for mobile application

Products are available for industrial temperature

range.

•

Available in 8-pin SOIC and TSSOP

Product Description

The P18xx is a versatile spread spectrum frequency

modulator designed specifically for a wide range of input

clock frequencies from 10 to 160 MHz (see Input Fre-

quency and Modulation Rate Selections). The P18xx

can generate an EMI reduced clock from crystal,

ceramic resonator, or system clock. The P18xx-A to

P18xx-H offer various combinations of spread options

and percentage deviations (see Spread Deviation Selec-

tions). These combinations include Down Spread,

Center Spread and percentage deviation range from

±0.625% to -3.50%.

The P18xx 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”.

The P18xx uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented by using a proprietary all-digital method.

The P18xx 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 P18xx 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.

Applications

The P18xx is targeted toward 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.

Alliance Semiconductor

2575 Augustine Drive • Santa Clara, CA 95054 • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com

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

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中文翻译

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与I1820F-08ST相关器件

型号	品牌	获取价格	描述	数据表
I1820F-08TR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820F-08TT	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820G-08SR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820G-08ST	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820G-08TR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820G-08TT	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820H-08SR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820H-08ST	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820H-08TR	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC
I1820H-08TT	ALSC	获取价格	Low Power Mobile VGA EMI Reduction IC

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