Could you give us some more detail of the ADXL345 insite
The internal filter is as follows:
1. There is a single pole analog anti-aliasing filter at ~1.6kHz.
2. The digital filter is an IIR type, first order.
3. The mechanical system acts as a two pole filter above ~7kHz.
As far as design particulars of the filters are concerned – that’s proprietary
information that we do not share.