MB88151 データシートの表示（PDF） - Fujitsu

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MB88151

Spread Spectrum Clock Generator

Fujitsu 

MB88151

■ PIN SETTING

When changing the pin setting, the stabilization wait time for the modulation clock is required. The stabilization

wait time for the modulation clock take the maximum value of “■ ELECTRICAL CHARACTERISTICS • AC

characteristics Lock-Up time”.

ENS modulation enable setting

ENS

L

H

Modulation

No modulation

Modulation

Note : Spectrum does not spread when “L” is set to ENS. The clock with low jitter can be obtained. Because of

ENS has Pull-up resistance, spectrum spread when “H” is set to it or open the terminal.

SEL0, SEL1 Modulation rate setting

SEL1

SEL0

L

L

L

H

H

L

H

H

Modulation rate

± 1.5%

± 0.5%

− 1.0%

− 3.0%

Note : The modulation rate can be changed at the level of the terminal.

Modulation type

Center spread

Center spread

Down spread

Down spread

• Center spread

Spectrum is spread (modulated) by centering on the frequency in modulation off.

Radiation level

Modulation width 3.0%

−1.5%

+1.5%

Frequency in modulation off

Center spread example of ± 1.5% modulation rate

Frequency

6

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