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MB88155-402 Datasheet(PDF) 1 Page - Fujitsu Component Limited. |
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MB88155-402 Datasheet(HTML) 1 Page - Fujitsu Component Limited. |
1 / 24 page DS04-29119-2Ea FUJITSU MICROELECTRONICS DATA SHEET Copyright©2005-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved 2006.11 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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