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ADXL326 frequency response drop seriously

Category: Hardware
Product Number: ADXL326

Hi ADI guys,

  We test ADXL326 recently as our new project application for low-frequency vibration ,and find there is some  frequency response problem,

  We test X axis ,when the frequency  exceed 500HZ, the acceleration magnitude drop seriously, as below:


frequency(Hz)   Acceleration
50 130
100 130
400 130
700 118
1000 2.8
1300 2.46

           The actual bandwidth is much lower than 1.6KHz from the spec,How can we improve the ADXL326 BW? We set the  the Cout of the RC filter about 3nf .

     Thanks a lot!