ADXL1005 noise problem

Hi  ADI guys,

  We use ADXL1005  for Machine bearing  monitoring ,the noise density is 75ug/hz, We set the BW 10KHz, so the RMS noise is about 7.5mg, 

We actually test the noise after MCU (read inner ADC raw data) is about 0.4mg,so whether the noise is well?

actually we also test the competitor product ,and read the noise is only 0.1mg,

so how to improve the noise performance?

thanks a lot!

Below is the figure test from our product. the noise is about 0.4mg


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