5G
/
LTE-A Module Series
5G EVB User Guide
5G_EVB_User_Guide 23 / 38
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.
LOUDL/P
LOUDR/N
Differential layout
Amplifier
circuit
Close to speaker
GND
GND
Codec
FB
FB
C1
C2
J0801
TLV3104
LM4871
BTB CON
J0802
U0801
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.
SPK_L
MIC_N
MIC_P
75pF
GND
GND
AGND
Close to Socket
Differential layout
15pF
10pF
33pF
GND
GND
AGND
Codec
TLV3104
Close to Socket
AGND
ESD
ESD
Audio Jack
22uF
J0901
1
4
5
3
2
SPK_R
10pF
33pF
22uF
6
MIC_P
0R
N
M
_
0
R
33pF
GND
AGND
0R
NM_0R
10pF
4.7uF
BTB CON
J0802
1uF
1uF
Figure 14: Reference Circuit Design for Earphone Interface J0901
