Reference Circuit Design For Microphone Interfaces - Quectel SC206E Series Hardware Design

⚫
The lineout interface uses differential output, lineout is used as audio PA input.
⚫
The headphone interface features stereo left and right channel output, and supports headphone
insertion detection.

3.22.1. Reference Circuit Design for Microphone Interfaces

MIC_BIAS1 MIC_BIAS1
MIC1_P MIC1_P
MIC1_M MIC1_M
Module Module
Figure 23: Reference Circuit Design for ECM Microphone Interface
MIC_BIAS3
MIC3_M
MIC3_P
Module
Figure 24: Reference Circuit Design for MEMS Microphone Interface
SC206E_Series_Hardware_Design
R1 R1
2.2K 2.2K
C1 C1
C2 C2
100 nF
33 pF
F1
R1
C1
0R
R2
33 pF
0R
C2
33 pF
R3 R3
0R 0R
R4 R4
0R 0R
C3 C3
R2
0R
33 pF
D1 D2
C3
100 nF
Smart Module Series
ECM MIC ECM MIC
D1
1
2
VDD
GND
3
GND
OUT
4
MEMS MIC
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