Does anyone know how repeatable is the ~15dB at ~20kHz frequency response peak of these (or similar) MEMS microphones? Obviously, I'm thinking of how practical it would be to use a notch filter to equalize the response to be flatter. Does the frequency of the peak vary for different samples of the same part number? Does the Q or amplitude of the peak?
I know that these parameters aren't specified for the ICS-40300, but I am curious whether the production methods would imply some sort of consistency that might be expected for the high frequency response.
The frequency response should be pretty repeatable from part to part. We specify +/- 2dB at 1Khz reference frequency. You can use this number as a rough guide line in the frequency range of 10Hz to 20KHz.
Thanks, Jin Jiang.
The resonance peak is just beyond 20kHz, though. Can I expect this peak position to remain relatively stable from unit-to-unit, or only expect that it would stay above 20kHz? Assuming that the mic is mounted with its aperture exposed directly, of course.
I'm interested in using the mic to about 40kHz (for a production measurement device)