MB88154 Просмотр технического описания (PDF) - Fujitsu

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MB88154

Spread Spectrum Clock Generator

Fujitsu 

MB88154

■ PIN SETTING

SEL 0, SEL 1 Modulation rate setting

SEL1

SEL0

L

L

L

H

H

L

H

H

modulation rate

MB88154-102, MB88154-103 MB88154-112, MB88154-113

Down spread

Center spread

− 1.0%

± 0.5%

− 2.0%

± 1.0%

− 3.0%

± 1.5%

No spread

No spread

Notes :

• The modulation rate can be changed at the level of the pin. Spectrum does not spread when “H” level

is set to SEL0 and SEL1 pin. The clock with low jitter can be obtained.

• When changing the modulation rate 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”.

• Center spread

Spectrum is spread (modulated) by centering on the input frequency.

Radiation level

Modulation width 3.0%

−1.5%

+1.5%

Input frequency

Modulation rate center spread example of ± 1.5%

• Down spread

Spectrum is spread (modulated) below the input frequency.

Radiation level

Modulation width 3.0%

−3.0%

Frequency in modulation off

Modulation width down spread example of − 3.0%

6

Frequency

Frequency

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