DS04-29127-1E

FUJITSU SEMICONDUCTOR

DATA SHEET

Copyright©2007 FUJITSU LIMITED All rights reserved

ASSP

Spread Spectrum Clock Generator

MB88151A

■ DESCRIPTION

MB88151A is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary

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

the internal modulator. It corresponds to both of the center spread which modulates frequency in modulation off

as Middle Centered and down spread which modulates so as not to exceed frequency in modulation off.

■ FEATURES

• Modulation rate :

± 0.5%, ± 1.5% (Center spread), − 1.0%, − 3.0% (Down spread)

• Equipped with oscillation circuit : Range of oscillation 8.3 MHz to 33.4 MHz

• Modulation clock output Duty : 40

% to 60%

• 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 :

− 40 °C to + 85 °C

• Package : SOP 8-pin

MB88151A-

100/101

(multiply-by-1)

MB88151A-

200/201

(multiply-by-2)

MB88151A-

400/401

(multiply-by-4)

MB88151A-

500/501

(multiply-by-1/2)

MB88151A-

800/801

(multiply-by-8)

Input

frequency/

Output

frequency

16.6 MHz to 33.4 MHz/

16.6 MHz to 33.4 MHz

16.6 MHz to 33.4 MHz/

33.2 MHz to 66.8 MHz

16.6 MHz to 33.4 MHz/

66.4 MHz to 133.6 MHz

16.6 MHz to 33.4 MHz/

8.3 MHz to 16.7 MHz

8.3 MHz to 16.7 MHz

66.4 MHz to 133.6 MHz

Modulation

clock

cycle-cycle

jitter

Less than100 ps

Less than 100 ps

Less than 150 ps

Less than 200 ps

Less than 150 ps