Obviously ADC does not have mode for frequency measurement of vibration signal, it is just discrete time digitizer which converts electrical signals into digital form. To precisely digitize and then calculate frequency of _arbitrary_ signal, you shall know signal properties - signal form and frequency range. Unfortunately you don't specify anything except "vibrations". It is clearly not enough to advise anything except - sample periodically with high enough sample rate and then apply time to frequency conversion, like FFT. If signal is filtered and do not contain noise then you can measure frequency directly - using timer, w/o ADC.
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