January 2015

DocID026988 Rev 1

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Application note

Pre-amplifying the analog output of a MEMS microphone

Pierre Sennequier

Introduction

MEMS microphones are an innovative way of recording sound.

STMicroelectronics provides a good portfolio of MEMS microphones. Products include the

MPxAxx family (e.g. MP23AB02B).

Such products have an analog output. Generally, this output signal is quite low and needs to

be amplified to reach the desired level required for the next stage (from microphone level to

line level).

This application note describes how to perform this “pre-amplification”.

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