Microphone Interfaces Configuration; Audio Electronic Characteristic - SIM Tech SIMCom SIM800C Hardware Design

SPKP
SPKN
Module
4.7.2.

Microphone Interfaces Configuration

MICP
MICN
Module
4.7.3.

Audio Electronic Characteristic

Table 14: Microphone input characteristics
Parameter
Microphone biasing voltage
Working current
Input impedance(differential)
Idle channel noise
Input level:-40dBm0
SINAD
Input level:0dBm0
SIM800C_Hardware_Design_V1.00
33pF
10pF
33pF
10pF
33pF
10pF
Figure 29: Speaker reference circuit
The lines in bold type should
be accorded to differential
signal layout rules
Figure 30: Microphone reference circuit
Min
13
29
Close to speaker
10pF
10pF
10pF
These components should
be placed to microphone
as close as possible
33pF
10pF
33pF
10pF
33pF
10pF
Typ Max
1.9 2.2
2.0
20 27
-67
69
32
Smart Machine Smart Decision
ESD
33pF
33pF
ESD
33pF
ESD
Electret
Microphone
ESD
Unit
V
mA
KΩ
dBm0
dB
dB
2014-10-30