MB88155 Ver la hoja de datos (PDF) - Fujitsu

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MB88155

Spread Spectrum Clock Generator

Fujitsu 

MB88155

■ OSCILLATION CIRCUIT

The following schematic on the left-hand side shows a sample connection of a general resonator. The oscillation

circuit contains a feedback resistor (1 MΩ) . The values of capacitors (C1 and C2) must be adjusted to the optimum

constant of the resonator used.

The following schematic on the right-hand side shows a sample connection of a 3rd overtone resonator. The

values of capacitors (C1, C2, and C3) and inductor (L1) must be adjusted to the optimum constant of the resonator

used.

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

you use for the most suitable value.

To use an external clock signal (without using the resonator) , input the clock signal to the XIN pin with the XOUT

pin connected to nothing .

• When using the resonator

XIN pin

C1

Rf (1 MΩ)

LSI internal

XOUT pin

XIN pin

LSI external

C2

C1

Rf (1 MΩ)

XOUT pin

L1

C2

C3

Fundamental resonator

3rd overtone resonator

• When using the external clock

XIN pin

Rf (1 MΩ)

LSI internal

XOUT pin

External clock

LSI external

OPEN

Note : Note that the jitter characteristic of the input clock signal may affect the cycle-cycle jitter

characteristic.

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