Quectel M10

M10 Hardware Design
M10_HD_V3.0 - 51 -
3.9.4. Earphone interface configuration
Amphenol
9001-8905-050
1
2
4
3
SPK2P
MIC2N
MIC2P
22uF
68R
33pF
GND GND
AGND
Close to Socket
Differential layout
33pF
AGND
33pF 10pF
GND
GND
GND
GND
AGND
Module
4.7uF
Figure 32: Earphone interface configuration
Table 12: Typical electret microphone characteristic
Parameter Min Type Max Unit
Working Voltage 1.2 1.5 2.0 V
Working Current 200 500 uA
External Microphone Load Resistance 2.2 k Ohm
Table 13: Typical speaker characteristic
Parameter Min Typ Max Unit
Normal
Output(SPK1)
Single
Ended
Load resistance 28 32 Ohm
Ref level 0 2.4 Vpp
Differential Load resistance 28 32 Ohm
Ref level 0 4.8 Vpp
Auxiliary
Output(SPK2)
Single
Ended
Load resistance 16 32 Ohm
Ref level 0 2.4 Vpp
Maxim driving
current limit of
SPK1 and SPK2
50 mA