LTE Module Series
M.2 EVB User Guide
M.2_EVB_User_Guide 21 / 37
SPK_L
MIC_N
MIC_P
75pF
GND
GND
AGND
Close to Socket
Differential layout
15pF
10pF
33pF
GND
GND
AGND
Codec
TE-A
Close to Socket
AGND
ESD
ESD
Audio Jack
22uF
U101
J302
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
J301
Figure 13: Reference Circuit Design for Earphone Interface J302
The figure and table below illustrate the pin assignment and definition of earphone interface J302.
1
2
3
4
6
5
Figure 14: Pin Assignment of J302
Table 5: Pin Definition of J302
Pin No.
Pin Name
Description
1
MIC_P
Microphone input-positive