MB88151A Просмотр технического описания (PDF) - Fujitsu

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MB88151A

Spread Spectrum Clock Generator

Fujitsu 

■ BLOCK DIAGRAM

VDD

MB88151A

SEL1

SEL0

ENS/XPD

XOUT

Modulation rate

setting

Modulation rate

setting

Modulation enable setting/

Power down setting

Reference clock

PLL block

Modulation

clock output

CKOUT

XIN

Rf = 1 MΩ

VSS

1

−

M

Reference clock 1

−

N

Phase

compare

Charge

pump

V/I

conversion

IDAC

Loop filter

ICO

Modulation clock

output

1

Modulation

−

L

Modulation logic

rate setting/

Modulation

enable setting

MB88151A PLL block

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

thereby dramatically reducing EMI.

5

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