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How to get the frequency to calculate the vibration value

Dear All,

I have the following queries to develop the MEMS Accelerometer to measure the vibration value in velocity (mm/sec)

1. If i am using ADXL335 or ADXL1002 means whether the frequency signal can be calculated by the sensor itself or external frequency needs to be given?

2. If the frequency signal needs to be given externally then how to interface the signal with these sensors?