MB88155 datasheet, PDF - EEWORLD Datasheet

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MB88155: DescriptionSpread Spectrum Clock Generator; File Size224KB，24 Pages; ManufacturerFUJITSU; Websitehttp://edevice.fujitsu.com/fmd/en/index.html

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MB88155 Overview

Spread Spectrum Clock Generator

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FUJITSU MICROELECTRONICS

DATA SHEET

DS04-29119-2Ea

Spread Spectrum Clock Generator

MB88155

■

DESCRIPTION

MB88155 is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary radi-

ation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the

internal modulator. For modulation, the MB88155 supports both center-spreading and down-spreading. It has a

non-modulated clock output pin (REFOUT) as well as a modulated clock output pin (CKOUT) .

■

FEATURES

• Input frequency :

•

12.5 MHz to 50 MHz (Multiplied by 1)

12.5 MHz to 20 MHz (Multiplied by 4)

Output frequency : CKOUT

12.5 MHz to 80 MHz

REFOUT The same as input frequency (not multiplied)

Modulation rate :

0.5%,

1.0% (center spread) ,

−

1.0%,

−

2.0% (Down spread)

Equipped with oscillation circuit : range of oscillation 12.5 MHz to 40 MHz (Fundamental oscillation)

40 MHz to 48 MHz (3rd overtone)

Modulation clock output Duty : 40% to 60%

Modulation clock cycle

−

cycle jitter : MB88155-1xx 12.5 MHz to 20 MHz less than 150 ps

MB88155-1xx

20 MHz to 50 MHz less than 100 ps

MB88155-4xx

less than 200 ps

Low current consumption by CMOS process : 5 mA (24 MHz : Typ-sample, no load)

Power supply voltage : 3.3 V

0.3 V

Operating temperature :

−

°C

Package : 8-pin plastic TSSOP

•

2006.11

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