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APPLICATION INFORMATION

Testing

SN74LVC1404

OSCILLATOR DRIVER

FOR CRYSTAL OSCILLATOR OR CERAMIC RESONATOR

SCES469C – AUGUST 2003 – REVISED JULY 2005

After the selection of proper component values, the oscillator circuit should be tested, using these components,

to ensure that the oscillator circuit shows required performance over the recommended operating conditions.

•

Without a crystal, the oscillator circuit should not oscillate. To check this, the crystal can be replaced by its

equivalent parallel-resonant resistance.

•

When the power-supply voltage drops, the closed-loop gain of the oscillator circuit reduces. Ensure that the

•

Ensure that the duty cycle, start-up time, and frequency drift over time is within the system requirements.

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