Quectel UC20 User Guide

UMTS/HSPA/LTE Module Series
UMTS&LTE EVB User Guide
UMTS&LTE_EVB_User_Guide Confidential / Released 16 / 32
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
U501
ALC5616
UMTS&LTE Module
VDD_EXT
4.7K 4.7K
BCLK
LRCK
DACDAT1
ADCDAT1
SCL
SDA
MIC_BIAS
MIC_BIAS
IN2P
IN2N
LOUDL/P
LOUDR/N
R
C
HPO_R
HPO_L
J601
J602
speaker
J603
NCP2823
2
4
5
3
1
6
J602 MIC
Figure 8: Audio Codec Circuit
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.
LOUDL/P
LOUDR/N
Differential layout
Amplifier
circuit
10pF
10pF
33pF
33pF
Close to speaker
GND
GND
ESD
ESD
Codec
FB
FB
C1
C2
J603
U601
ALC5616
NCP2823
Figure 9: Loud Speaker Circuit
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:
Quectel
Confidential

Quectel UC20 Specifications

General

Brand	Quectel
Model	UC20
Category	Control Unit
Language	English