Sinc Filter Order and value output of DFSDM

[crackl1ng]

Hello dear ST-Forum,

I'm currently working on DFSDM and MEMS-Microphone and am trying out the sinc filters. By changing the filter order e.g. from filter order 1 to filter order 3, the values increase dramatically. I have not found any proper calculation how exactly the sinc filter is applied. Does anyone have more information about that?

Kind regards

[Imen.D]

Hello @crackl1ng​ ,

Are you using the tutorial for the DFSDM excel file ?

I advise you to check the DFSDM application note: AN4990 "Getting started with sigma-delta digital interface on applicable STM32 microcontrollers", which contains an example of Sinc filter function.

Imen