Loud Speaker (J603); Earphone (J601) - Quectel UC20 User Manual

UMTS&LTE Module
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
I2C_SCL
I2C_SDA
VDD_EXT

3.3.1. Loud Speaker (J603)

Figure 9 shows the loud speaker circuit with external audio Class-D amplifier. And the name of the J603
pins has been marked on the EVB.
U601
Codec
LOUDL/P
ALC5616
LOUDR/N

3.3.2. Earphone (J601)

An earphone can be used in audio interface J601. Figure 10 shows the circuit of audio interface J601 for
earphone:
UMTS&LTE_EVB_User_Guide
R
BCLK
C
LRCK
DACDAT1
ADCDAT1
SCL
SDA
Figure 8: Audio Codec Circuit
Differential layout
C1
C2
Figure 9: Loud Speaker Circuit
UMTS/HSPA/LTE Module Series
ALC5616
MIC_BIAS
IN2P
IN2N
U501
HPO_L
HPO_R
LOUDL/P
LOUDR/N
10pF
Amplifier
FB
circuit
NCP2823
FB
10pF
Confidential / Released
UMTS&LTE EVB User Guide
J602 MIC
1
4
6
5
3
2
speaker
J603
NCP2823
Close to speaker
GND
33pF
ESD
J603
ESD
33pF
GND
J601
J602
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