MB88155 Datasheet, PDF (1/24 Pages) Fujitsu Component Limited. – Spread Spectrum Clock Generator

FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-29119-2E
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 : − 40 °C to + 85 °C
• Package : 8-pin plastic TSSOP
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