Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 60 / 111
⚫
The module has three differential audio input channels.
⚫
The output voltage range of the two MIC_BIAS is programmable between 2.2 V and 3.0 V, and the
maximum output current is 2 mA.
⚫
The earpiece interface uses differential output.
⚫
The loudspeaker interface uses differential output as well. The output channel is available with a
Class-D amplifier whose maximum output power is 0.8 W when the load is
8 Ω.
⚫
The headset interface features stereo left and right channel output, and headset insertion detection
function is supported.
3.20.1. Reference Circuit Design for Microphone Interfaces
MIC1_N
NM
ECM MIC
C3
Module
MIC1_P
C1
MIC_BIAS1
1
2
F1
D2
MIC_P
MIC_N
510R
2.2
μF
NM
C2
D1
1.5K
510R
1.5K
R1
R2
R3
R4
F2
NM
R5
GND
Figure 24: Reference Design for ECM Microphone
MIC3_P
33 pF
MEMS MIC
R2
R1
C2
Module
MIC3_N
0 R
C1
MIC_BIAS1
1
2
3
4
F1
D2
OUT
GND
GND
VDD
1
μF
C4
0 R
33 pF
D1
33 pF
C3
R3
D3
0 R
GND
Figure 25: Reference Design for MEMS Microphone