Audio Interfaces; Digital Audio Codec Board Interface (J501) - Quectel UMTS&LTE EVB User Manual

4.5. Audio Interfaces

Quectel UMTS&LTE EVB provides one digital audio codec board interface (PCM) J501 and three analog
audio interfaces J601, J602 and J603. This chapter gives a detailed introduction on these audio
interfaces.

4.5.1. Digital Audio Codec Board Interface (J501)

The UMTS&LTE EVB supports two different kinds of external digital audio codecs named ALC5616 and
TLV320AIC3104. The codec circuit is assembled on an independent small board which can be
interconnected with EVB by the BTB connector J501.
Customers can select different codecs according to their own application demands, and also can use AT
command to switch between codecs. For example, AT+QDAI=3 is used to switch codec from
TLV320AIC3104 to ALC5616, and AT+QDAI=5 is used to switch codec from ALC5616 to
TLV320AIC3104. For more details about the AT commands, please refer to document [4] and
document [5].
The following figure shows a reference circuit design for digital audio codecs, and Figure 13 shows the
connection between codec board and EVB.
UMTS&LTE Module
R
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
I2C_SCL
I2C_SDA
VDD_EXT
UMTS&LTE_EVB_User_Guide
BTB CON
ALC5616/TLV3104
BCLK
C
LRCK
DACDAT1
ADCDAT1
SCL
SDA
J501
Figure 12: Digital Audio Codec Circuit
UMTS/HSPA/LTE Module Series
BTB CON
MIC_BIAS
IN2P
IN2N
U101
HPO_L
HPO_R
LOUDL/P
LOUDR/N
J501
Confidential / Released
UMTS&LTE EVB User Guide
J602 MIC
1
4
6
J601
5
3
2
J602
speaker
J603
NCP2823
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