Figure 15: Microphonei; Figure 16: Differentiali - Wavecom CM52 Integrator's Manual

The microphone should preferably be connected to its pre-amplifier differentially which will
minimize noise pickup from possible ground current.
AFMS:
An application using the analog audio interface must re-reference the AFMS-signal from
AGND to its own internal BIAS. The figure shows a differential implementation. C1 is chosen to
create the correct HP frequency response. R1 and R2 determine the gain; C2 and R2 determine the
LP frequency response.
CM52 Integrators' Manual
WI_DEV_CM52_UGD_001-001
Page 32 of 53
Figure 15: Microphone Implementation Example
Figure 16: Differential Implementation Example
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CM52 Integrators' Manual