P2781屬于集成電路（IC）的時鐘發(fā)生器PLL頻率合成器。由安森美半導(dǎo)體公司制造生產(chǎn)的P2781時鐘發(fā)生器，PLL，頻率合成器時鐘發(fā)生器、PLL 和頻率合成器集成電路 (IC) 可為邏輯器件提供參考信號的穩(wěn)定定時脈沖，這些器件包括計算機、微控制器、數(shù)據(jù)通信系統(tǒng)和圖形/視頻發(fā)生器。這些集成電路可能包括緩沖器、驅(qū)動器、分頻器、倍頻器、多路復(fù)用器、合成器、扇出分配器和預(yù)分頻器。

Product Description

The P278xA is a versatile spread spectrum frequency modulator designed specifically for digital camera and other digital video and imaging applications. The P278xA reduces electromagnetic interference (EMI) at the clock source, which provides system wide reduction of EMI of all clock dependent signals. The P278xA allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations.

特性 Features

?Provides up to 15dB of EMI suppression

?FCC approved method of EMI attenuation

?Generates a 1X, 2X, and 4X low EMI spread spectrum

clock of the input frequency

?Input frequency range from 3 to 78MHz

?External loop filter for spread adjustment

?Spreading ranges from ±0.25 to ±5.0

?Ultra low cycle-to-cycle jitter

?Zero-cycle slip

?3.3V operating voltage range

?Ultra-low power CMOS design

?P278xA is available in an 8 pin SOIC Package

Applications

The P278xA is targeted towards MFP, xDSL, fax modem,set-top box, USB controller, DSC, and embedded systems.