Receiver And Speaker Interface Configuration - Quectel M12 Hardware Design

M12 Hardware Design
circuit is shown in Figure 27.
Module
MICxP
MICxN
Figure 27: Microphone reference design for AIN1&AIN2

3.9.3. Receiver and speaker interface configuration

Module
SPK1P
SPK1N
M12_Hardware_Design_V3.3
Differential layout
Differential layout
Figure 28: Reference design for AOUT1
Close to Microphone
GND
10pF 33pF
0603 0603
10pF 33pF
0603 0603
10pF 33pF
0603 0603
GND
Close to speaker
GND
10pF
33pF
0603
0603
33pF
10pF
0603
0603
10pF
33pF
0603
0603
GND
ESD
Electret
Microphone
ESD
ESD
ESD
- 47 -