Analog Audio Interfaces (J0801/J0901); Loudspeaker Interface (J0801); Earphone Interface (J0901) - Quectel RG50-Q Series User Manual

3.5.2. Analog Audio Interfaces (J0801/J0901)

3.5.2.1. Loudspeaker Interface (J0801)

Audio interface J0801 is designed for loudspeakers and the following figure shows a reference design of
loudspeaker with an external audio amplifier.
Codec
LOUDL/P
TLV3104
LOUDR/N
Figure 13: Reference Circuit Design for Loudspeaker Interface J0801

3.5.2.2. Earphone Interface (J0901)

Audio interface J0901 is designed for earphone. A reference circuit design is shown by the following
figure.
Codec
22uF
TLV3104
22uF
AGND
BTB CON
Figure 14: Reference Circuit Design for Earphone Interface J0901
5G_EVB_User_Guide
J0802
Differential layout
C1
C2
BTB CON
Differential layout
J0802
MIC_N
MIC_P
SPK_L
1uF
SPK_R
1uF
10pF
U0801
Amplifier
FB
circuit
LM4871
FB
Close to Socket
GND AGND
GND GND
10pF
33pF
4.7uF 75pF
15pF
Close to Socket
10pF 33pF
33pF
ESD
GND
5G/LTE-A Module Series
5G EVB User Guide
Close to speaker
GND
J0801
GND
GND
ESD
AGND
0R J0901
2
NM_0R
4
6
5
3
1
Audio Jack
0R
MIC_P
AGND
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