Quectel SG368Z Series 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 Series Specifications

General

Brand	Quectel
Model	SG368Z Series
Category	Control Unit
Language	English