Yuga CLM920 TE5 LTE Module Hardware Manual

CLM920_TE5 LTE Module Hardware Manual
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YUGA Information Technology Co.,Ltd
3.10.2 Analog Voice Reference Design
CLM920_TE5 module’s analog voice reference design is as follow:
Figure 3- 18 Analog voice reference circuit
Figure 3- 19 External audio codec reference circuit
①MIC + / MIC - channel used for the microphone differential input, module has
provided microphone bias voltage for the operation from internal and external bias
circuit is not needed. Mic usually use the electric microphone.
②SPK+/SPK- channel usually used for handset or headset. When using external
power amplifier, switch the module to headset output by AT+CSDVC=4, then connect
PIN1
PIN3
PIN5
PIN7
Module
FB2
FB1
FB4
FB3
33pF
10pF
33pF
10pF
33pF
10pF
33pF
10pF
MIC
SPK
Close to SPK
Close to MIC
INP
INN
VOP
VON
VBAT
R5
100nF
R4
R3
C2
C1
REC+
REC-
EN
OFF
ON
R2
R1
Close to SPK
33pF
10pF
SPK
10pF
33pF
33pF
PVDD
AVDD
GND
SHUTDOWN