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⚫
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
MIC_BIAS1
Module
MIC_BIAS1
Module
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
R1
510R
MIC1_ P
MIC1_N
C3
C2
GND
NM
NM
Figure 24: Reference Design for ECM Microphone
MIC3_N
C1
33 pF
MIC3_P
GND
Figure 25: Reference Design for MEMS Microphone
R2
1.5K
F1
C1
2.2 μF
F2
R3
R4
1.5K
510R
F1
R1
0 R
R2
0 R
C2
C3
33 pF
33 pF
Smart Module Series
1
MIC_P
2
MIC_N
ECM MIC
D2
D1
R5
NM
C4
D1
1 μF
1
2
VDD
GND
3
GND
OUT
4
D3
D2
MEMS MIC
R3
0 R
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