MB88154 データシートの表示（PDF） - Fujitsu

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MB88154

Spread Spectrum Clock Generator

Fujitsu 

■ BLOCK DIAGRAM

VDD

MB88154

SEL1

SEL0

XOUT

Modulation rate

setting

Reference

clock

PLL block

Clock output

CKOUT

XIN

Rf = 1 MΩ

Reference clock output

REFOUT

VSS

Reference

clock

1

−

M

Phase

compare

Charge

pump

V/I

conversion

IDAC

1

−

Loop filter

N

ICO

Modulation

Clock

output

1

−

L

Modulation

logic

Modulation

rate setting

Modulation

MB88154 PLL block

enable setting

A glitchless IDAC (current output D/A converter) provides precise modulation, thereby dramatically

reducing EMI.

5

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