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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-29119-1E
Spread Spectrum Clock Generator
MB88155
■ DESCRIPTION
MB88155 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. For modulation, the MB88155 supports both center-spreading and down-spreading. It has a non-modulated output pin (REFOUT) as well as a modulated 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.