Audio sampling rate mp34dt05-a

[SWink.1]

I am using the mp34dt05-a mems microphone and receive the PDMdata stream. Now I want to do the signal processing as recommended in application note AN5027: "Interfacing PDM digital microphones using STM32 MCUs and MPUs". Thus after receiving the PDM data stream I want to do the PCM conversion as decimation stage. The decimation factor is in the range between 48 to 128 but it depends on the audio sampling frequency of the mp34dt05-a microphone. Unfortunately I can't find any note in the datasheet despite the input clock frequency which is in the range of 1,2 MHz to 3,25 MHz.

Does anybody know which audio sampling frequency is used in the mp34dt05 microphone?

[Eleon BORLINI]

Hi @SWink.1​ , the MP34DT05-A device is typically tested at 2.4MHz (MIC_CLOCK), that feeds the internal delta-sigma converter. Using this MIC_CLOCK frequency with a decimation x48 you will get a PCM samples frequency of 50kSamples. Regards

[SWink.1]

Thank you very much for the fast answer.