MB88152A Ver la hoja de datos (PDF) - Cypress Semiconductor

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MB88152A

Spread Spectrum Clock Generator

Cypress Semiconductor 

MB88152A

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 you 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 pin.

When using the resonator

XIN Pin

Rf (1 MΩ)

MB88152A Internal

XOUT Pin XIN Pin

Rf (1 MΩ)

XOUT Pin

MB88152A External

L1

C1

C2

XIN PCin1

C2

C3

Fundamental resonator

3rd over tone resonator

When using an external clock

XIN Pin

External clock

Rf (1 MΩ)

MB88152A LSI Internal

XOUT Pin

MB88152A LSI External

OPEN

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

Document Number: 002-08308 Rev. *B

Page 18 of 24

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