I was wondering how much variation we can expect on the output common mode of a MEMS microphone.
How strongly is it supply dependent or temperature dependent?
The common mode voltage on the output of our analog MEMS microphones is typically 0.8 V. We don't specify a min or max for that spec, but you should not expect to see significant variation from part-to-part. This voltage is constant across the range of supply voltages (typically 1.5 to 3.3 V).
Are you looking to use the microphone in a dc-coupled application? The variation of the voltage typically isn't a concern in a design because the microphone's output is usually ac-coupled.
Thank you for a prompt answer. I was indeed planning on DC coupling the mic.
As far as the variation is concerned, by not significant you mean +/- 100mV
Will the output CM be temperature dependent? any idea of the temp
On Tue, Nov 20, 2012 at 3:22 PM, JeradL <
We typically see a distribution of tighter than +/-100 mV from the nominal 0.8 V on the dc offset. Since this isn't a min/max number that we specify in the data sheet, I don't have precise limits to share. I don't have data available to share right now on the dc level's temperature dependence.
If you can share, can you explain why you prefer to dc couple the microphone in your design?
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