Quectel UC20

UMTS/HSPA/LTE Module Series
UMTS&LTE EVB User Guide
UMTS&LTE_EVB_User_Guide Confidential / Released 18 / 32
The following figure shows the sketch of audio plug which suits for the audio jack on UMTS&LTE EVB.
2
1
MIC
GND
SW
SPK_R
SPK_L
3
4
32Ω
32Ω
Figure 12: The Sketch of Audio Plug
3.3.3. Handset (J602)
A handset can be used in audio interface J602. Figure 13 shows the circuit of audio interface J602 for
handset. And the name of the corresponding pins has been marked on the EVB.
ESD
33pF
ESD
ESD ESD
33pF33pF
33pF33pF33pF
10pF10pF10pF
10pF 10pF 10pF
IN2P
IN2N
LOUDL/P
LOUDR/N
FB
J602
U501
Codec
ALC5616
4
1
3
2
Figure 13: Handset Circuit
3, 5
SPKP
Speaker output right channel
4, 6
SPKL
Speaker output left channel
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