Loudspeaker Interface Circuit - Quectel EC200U Series Hardware Design

NOTE
MIC channel is sensitive to ESD, so it is not recommended to remove the ESD components used for
protecting the MIC.

3.14.3. Loudspeaker Interface Circuit

Module
EC200U_Series_Hardware_Design
Close to Module
GND
33 pF
10 pF
0603
0603
MIC_P
10 pF
33 pF
0603
0603
Module
MIC_N
10 pF
33 pF
0603
0603
GND
Figure 23: Reference Circuit of Microphone Interface
Differential
layout
LODUSPK_P
LOUDSPK_N
Figure 24: Reference Circuit of Loudspeaker Interface
LTE Standard Module Series
Close to
Microphone
GND
Differential
10 pF
layout
0603
10 pF
0603
10 pF
0603
GND
Close to Speaker
GND
GND
33 pF
10 pF
0603
0603
10 pF
33 pF
0603 0603
10 pF 33 pF
0603
0603
GND
GND
GND
GND
33 pF
ESD
0603
33 pF
0603
Electret
Microphone
33 pF
ESD
0603
GND
GND
GND
ESD
0R
0R
8 Ω
ESD
GND
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