Specifications

M80 Hardware Design
M80_HD_V1.0 - 55 -
The differential audio traces have to be placed according to the differential signal layout rule.
3.10.2. Microphone interfaces design
AIN1/IN2 channels come with internal bias supply for external electret microphone. A reference
circuit is shown in Figure 27.
10pF
33pF
33pF
33pF
Close to Microphone
MICxP
MICxN
GND
GND
Differential layout
Module
Electret
Microphone
GND
GND
10pF
10pF
GND
GND
ESD
ANTI
ESD
ANTI
AGND
Figure 27: Microphone interface design of AIN1&AIN2
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