MB88154A Просмотр технического описания (PDF) - Cypress Semiconductor

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MB88154A

Spread Spectrum Clock Generator

Cypress Semiconductor 

MB88154A

17. Oscillation Circuit

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

resistance (Rf) . 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)

MB88154A LSI Internal

XOUT Pin

XIN Pin

MB88154A LSI External

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)

MB88154A LSI Internal

XOUT Pin

MB88154A LSI External

OPEN

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

Document Number: 002-08252 Rev. *B

Page 17 of 23

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