MB88152 데이터 시트보기 (PDF) - Fujitsu

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MB88152

Spread Spectrum Clock Generator

Fujitsu 

MB88152

s CRYSTAL OSCILLATOR CIRCUIT

The left side of figures below shows the connection example about general crystal resonator. The oscillation

circuit has the built-in feedback resistanc (1 MΩ). The value of cpacity (C1 and C2) is required adjusting to the

most suitable value of an individual crystal resonator.

The right side of figures below shows the example of connecting crystal for the 3rd over-tone oscillation. The

value of capacity (C1, C2 and C3) and inductance (L1) is needed adjusting to the most suitable value of an individual

crystal oscillator. When an external clock is used (the crystal resonator is not used) , input the clock to XIN pin

and do not connect anything with XOUT.

XIN Pin

C1

Rf (1 MΩ)

Internal

XOUT Pin

XIN Pin

External

C2

C1

Rf (1 MΩ)

XOUT Pin

L1

C2

C3

Normal crystal oscillation

3rd over tone

s DEFINITION OF JITTER

• Cycle-cycle jitter

Output clock

tn

tn + 1

TJC = |tn − tn + 1|

Cycle - cycle jitter is defined the difference between a certain cycle and immediately after

(or, immediately before).

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