MB88156-000 查看數據表（PDF） - Fujitsu

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产品描述 (功能)

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MB88156-000

Spread Spectrum Clock Generator

Fujitsu 

■ BLOCK DIAGRAM

VDD

MB88156

XPD

ENS

SPRD

FREQ

MLTP1,

MLTP0

SEL

Power down

Modulation enable

setting

Modulation type

setting/frequency

down setting

Frequency setting

Multiplication rate

setting

Modulation level

setting/frequency

falling width setting

PLL block

Modulation

clock output

CKOUT

XOUT

Reference clock

XIN

Power down signal

Rf = 1 MΩ

Reference clock output

REFOUT/N.C.

VSS

1

−

M

Reference clock 1

−

N

Phase

compare

Charge

pump

V/I

conversion

Loop filter

IDAC

ICO

Modulation

clock output

Modulation level setting/

frequency falling width setting

1

−

Modulation logic

SEL

ENS

L

MB88156 PLL block

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

reducing EMI.

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