Quectel SG368Z-AP User Manual

Smart Module Series
SG368Z_Series_Hardware_Design 52 / 113
⚫ The module offers 1 differential MIC input pair, which can also be used as 2 single-ended MIC input
channels.
⚫ VCCIO1 can be used as MIC_BIAS and the output voltage is 1.8 V by default.
⚫ The loudspeaker interface uses the differential output. The output channel is available with a Class D
amplifier whose maximum output power is 1.3 W when the load is 8 Ω.
⚫ The headset interface features stereo left and right channel output, and headset insert detection
function is supported.
4.8.1. Microphone Interface Reference Design
MIC_M
ECM MIC
Module
MIC_P
1
2
D2
MIC_P
MIC_M
D1
GND
C1
100pF
100R
R1
1.1K
R2
1.1K
R3
VCCIO1
C2
1 μF
Figure 13: Reference Design of Differential Microphone Interface
HPH_R
102
AO
Headphone right channel
output
HPH_GND
101
AI
Headphone reference ground
If unused, connect this pin
to ground.
SPK_P
104
AO
Loudspeaker output (+)
SPK_M
103
AO
Loudspeaker output (-)
MIC_P
98
AI
Microphone input (+)
MIC_M
97
AI
Microphone input (-)
VCC_SPK_HP
176
PI
Analog audio power supply
If the analog audio
function is not used, this
pin needs to be connected
to VBAT.

Quectel SG368Z-AP Specifications

General

Brand	Quectel
Model	SG368Z-AP
Category	Control Unit
Language	English