Quectel Smart EVB G5 - Microphone Interfaces

Smart Module Series
Smart_EVB_G5_User_Guide 46 / 66
ESD
ESD
100pF
EAR_P
EAR_N
FB
Earphone
33pF
33pF
J1204
Module
Figure 28: Reference Design for Earphone Interface
4.7.4. Microphone Interfaces
Smart EVB G5 provides one single-ended microphone input and one differential microphone input for
microphone interfaces. The single-ended microphone input is for MEMS-type microphone and the
differential microphone input is for ECM-type microphone. The following figures show a reference circuit
design for microphone interfaces.
C2
MIC1_P
2
B1
D1
Module
U1202
MIC3_P
MEMS
C3
C2
MIC3_N
MIC_BIAS1
1
2
3
4
B1
D1
OUT
GND
GND
VDD
C1
Module
U1201
B2
MIC_P
MIC_NMIC1_N
1
C1
100pF
C5
100nF150pF
C4
100nF
100nF
33pF
ECM
Figure 29: Reference Design for Microphone Interfaces