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ADXL375 noise

Question asked by jcvm on Jan 17, 2017

I have and ADXL375 Eval board connected to a Adafruit M0 processor board.  I am currently using SPI communication with a speed of 4MHz.  I see noise on the accel around +/- 1G at 3200 ODR and +/- .1G at 100 ODR.  The spec suggests this should be .28G and .05G respectively (sqrt3200*.005, sqrt100*.005).  What could be the possible causes of the extra noise I am seeing?  could a varying input voltage cause this?

 

3200 ODR:

 

100 ODR:

 

Thank you for looking.

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