MB88154 Просмотр технического описания (PDF) - Fujitsu

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MB88154

Spread Spectrum Clock Generator

Fujitsu 

MB88154

■ OSCILLATION CIRCUIT

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

the built-in feedback resistance (1 MΩ) . The value of capacity (C1 and C2) is required adjusting to the most

suitable value of an individual resonator.

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

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

resonator. The most suitable value is different by individual resonator. Please refer to the resonator manufacturer

which use for the most suitable value. When an external clock is used (the resonator is not used) , input the

clock to XIN pin and do not connect anything with XOUT.

• When using a resonator

XIN Pin

C1

Rf (1 MΩ)

Internal LSI

XOUT Pin

XIN Pin

External LSI

C2

C1

Rf (1 MΩ)

XOUT Pin

L1

C2

C3

Normal resonator

3rd over-tone resonator

• When using an external clock

XIN Pin

External clock

Rf (1 MΩ)

LSI Internal

XOUT Pin

LSI External

OPEN

Note : Note that a jitter characteristic of an input clock may cause an affect a cycle-cycle jitter

characteristic.

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