Datasheet > P2779AG-08ST

P2779AG-08ST

更新时间： 2024-11-07 20:21:47

品牌	Logo	应用领域
PULSECORE		时钟 ISM频段光电二极管外围集成电路晶体
页数	文件大小	规格书
8页	197K
描述
38MHz, VIDEO CLOCK GENERATOR, PDSO8, 0.150 INCH, GREEN, SOIC-8

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P2779AG-08ST 数据手册

June 2005

rev 0.1

P2779A

Low-Cost Notebook EMI Reduction IC

Features

the clock source, which provides system-wide reduction of

EMI of all clock dependent signals. The P2779A allows

significant system cost savings by reducing the number of

circuit board layers and shielding that are traditionally

required to pass EMI regulations.

Provides up to 15dB of EMI suppression

FCC approved method of EMI attenuation

Generates a 1X low EMI spread spectrum clock of

the input frequency

Operates between 20MHz and 38MHz input

frequency range

The P2779A uses the most efficient and optimized

modulation profile approved by the FCC.

External loop filter for spread percentage adjustment

Spreading ranges from ±0.25% to ±2.5%

Ultra low cycle-to-cycle jitter

Zero-Cycle slip at small deviations

3.3 V Operating Voltage

10 mA output drives

TTL or CMOS compatible outputs

Low power CMOS design

The P2779A 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.

Available in 8-pin SOIC and TSSOP Packages

Available for Industrial temperature operating

range (-40º C to 85º C)

Applications

The P2779A is targeted toward mobile 3D graphics chip set

applications.

Product Description

The P2779A is a versatile spread spectrum frequency

modulator designed specifically for mobile and digital

camera and other digital video and imaging applications.

The P2779A reduces electromagnetic interference (EMI) at

Block Diagram

VDD

PLL

Modulation

XIN

XOUT

REF

Frequency

Divider

Crystal

Oscillator

Output

Loop

Filter

Phase

VCO

Divider

Detector

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 8

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与P2779AG-08ST相关器件

型号	品牌	获取价格	描述	数据表
P2779AG-08-ST	PULSECORE	获取价格	Low-Cost Notebook EMI Reduction IC
P2779AG-08TR	ALSC	获取价格	Low-Cost Notebook EMI Reduction IC
P2779AG-08-TR	PULSECORE	获取价格	Low-Cost Notebook EMI Reduction IC
P2779AG-08TT	ALSC	获取价格	Low-Cost Notebook EMI Reduction IC
P2779AG-08-TT	PULSECORE	获取价格	Low-Cost Notebook EMI Reduction IC
P277CE103K300A	KEMET	获取价格	PME271E Series Metallized Impregnated Paper, Class X1, 300 VAC
P277CE103M300A	KEMET	获取价格	PME271E Series Metallized Impregnated Paper, Class X1, 300 VAC
P277CE683M300A	KEMET	获取价格	Paper Capacitor, Paper, 630V, 20% +Tol, 20% -Tol, 0.068uF, Through Hole Mount, 9430, RADIA
P277CE683M300C	KEMET	获取价格	Paper Capacitor, Paper, 630V, 20% +Tol, 20% -Tol, 0.068uF, Through Hole Mount, 9430, RADIA
P277CE683M300L	KEMET	获取价格	Paper Capacitor, Paper, 630V, 20% +Tol, 20% -Tol, 0.068uF, Through Hole Mount, 9430, RADIA

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