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TPA301: Low-pass filter on datasheet not working as expected.

Daniel DeLuca
Prodigy 220 points
Part Number: TPA301

We're using the TPA301 in conjunction with two MEMS microphones. We are using the datasheet equations to filter the microphone signal, but it is not filtering whatsoever. The frequency response of the filtered vs unfiltered signal is essentially the same. Are we using this amplifier incorrectly?

  • +1
    TI__Guru** 100135 points

    Hi Daniel,

    The schematic looks correct, as well as calculated filter cutoff frequencies.

    You mention the response is the same with or without the filter, can you share your test measurements? What is the input signal? Are both cases showing the same amplitude at the output for signals higher than 6kHz?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators