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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
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