Smart Module Series
SC262R_Series_Hardware_Design 67 / 115
⚫
The module offers three audio input channels, including three single-ended channels.
⚫
The output voltage range of the two MIC_BIAS is programmable between 1.6 V and 2.85 V, and the
maximum output current is 3 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 output power is 1362 mW when the lo
ad is 8 Ω.
⚫
The headphone interface features stereo left and right channel output, and supports headphone
insertion detect.
3.22.1. Reference Circuit Design for Microphone Interfaces
MIC1_P
ECM MIC
R2
R1
Module
D1
MIC_GND
33 pF
C1
0R
0R
R3
0R
Figure 24: Reference Circuit Design for ECM Microphone Interface
MIC_BIAS2
155
AO
Bias voltage output for microphone 2
V
O
= 1.6
–2.85 V
MIC3_P
148
AI
Microphone input for channel 2 (+)
MIC_BIAS1
147
AO
Bias voltage output for microphone 1
V
O
= 1.6
–2.85 V
EAR_P
8
AO
Earpiece output (+)
EAR_N
9
AO
Earpiece output (-)
SPK_P
10
AO
Speaker output (+)
SPK_N
11
AO
Speaker output (-)
HPH_R
136
AO
Headphone right channel output
HPH_REF
137
AO
Headphone reference ground
HPH_L
138
AO
Headphone left channel output
HS_DET
139
AI
Headset hot-plug detect
High level by default.
