MB88155 データシートの表示（PDF） - Fujitsu

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MB88155

Spread Spectrum Clock Generator

Fujitsu 

■ BLOCK DIAGRAM

VDD

MB88155

ENS/XPD

SEL

XOUT

Modulation enable/

power down setting

Modulation rate

setting

Reference

clock

PLL block

Clock output

CKOUT

Power down signal

XIN

Rf = 1 MΩ

Reference clock output

REFOUT

VSS

1

−

M

Phase Charge

compare pump

V/I

conversion

IDAC

Reference

1

clock

−

N

Loop filter

ICO

Modulation

clock

output

1

Modulation rate

−

Modulation logic

setting/

L

Modulation

MB88155 PLL block

enable setting

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

reducing EMI.

7

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