Microphone Interfaces Configuration; Earphone Interface Configuration; Referenced Electronic Characteristic - SIM Tech SIM900D HD Manual

SIM900D Hardware Design

3.10.2 Microphone Interfaces Configuration

MODULE
MIC1P
MIC1N

3.10.3 Earphone Interface Configuration

MIC2N
MIC2P
MODULE
SPK2P

3.10.4 Referenced Electronic Characteristic

SIM900D_HD_V1.02
Differential layout
Figure22: Microphone interface configuration
Close to MODULE Differential
layout
1uF
10R
33pF 33pF
GND GND
Figure23: Earphone interface configuration
42
Close to Microphone
GND
GND
GND
ESD
10pF 33pF
ANTI
10pF 33pF
ESD
33pF ANTI
10pF
GND
GND GND
Close to Socket
GND GND
33pF 33pF
GND
100R
33pF 10pF
GND
GND GND
Electret
Microphone
GND
3
4
2
1
Amphenol
GND
09.04.2010