I need to know the filters sequence for our application. The AD7762 has 3 filters. The first 2 are simple decimation filter (if I understand it right). The 3rd filter is a FIR and decimation filter with fixed decimation of 2. Is the decimation applied before or after the filter? Maybe I don't understand the 3rd filter. It makes a big difference for our application. Figure 31 in the datasheet shows a bandwidth responce of 625kHz, does it mean that the decimation of 2 is applied after passing through the FIR?

Hi Benure,

Each of the filters are low pass filters with decimation, each with different corner frequencies. The first (x4) and last(x2) stages have fixed decimation with the middle offering variable decimation. The last filter has the decimation of 2 built into it and it dominates the transfer function as it is most aggressive.

What is the context behind your question I don't really understand?

Regards,

Michael.