Spread Spectrum Clock Generator - Fujitsu Media Devices
Description
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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.
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% (Continued)
■ PACKAGE
8-pin plastic TSSOP
(FPT-8P-M05)
MB88155
(Continued) • 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
2
MB88155
■ PRODUCT LINEUP
The MB88155 is available in different models : 2 models different in multiplier ( × 1 and × 4) , 2 in modulation type (center-spreading and down-spreading) , 2 in input frequency range at a multiplier of 1 (12.
5 MHz to 25 MHz and 25 MHz to 50 MHz) , and 1 in input frequency range at a multiplier of 4 (12.
5 MHz to 20 MHz) .
The MB88155 is also available in two versions : modulation-on/off selectable version (with ENS pin) and powerdown function built-in version (with XPD pin) .
MB88155-M T F Input frequency range, With/without ENS...
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