Quectel UMTS&LTE EVB - Analog Audio Interfaces

UMTS/HSPA/LTE Module Series
UMTS&LTE EVB User Guide
UMTS&LTE_EVB_User_Guide Confidential / Released 23 / 44
Codec board
EVB
Figure 13: Connection between Codec Board and EVB
4.5.2. Analog Audio Interfaces (J603/J601/J602)
4.5.2.1. Loud Speaker Interface (J603)
Audio interface J603 is designed for loud speaker and the following figure shows a reference design of
loud speaker with an external Class-D audio amplifier.
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
U101
ALC5616/T
LV3104
NCP2823
BTB CON
J501
Figure 14: Reference Circuit Design for Loud Speaker Interface J603
Quectel
Confidential