Referenced Electronic Characteristics - SimCom SIM900D Hardware Design

SIM900D Hardware Design

3.10.4 Referenced Electronic Characteristics

Table14: MIC Input Characteristics
Parameter
Working Voltage
Working Current
External Microphone Load Resistance
Internal biasing DC Characteristics
Differential input
THD <1% at F=1KHz;
voltage
pre-amp gain = 20 dB;
PGA gain = 14 dB
THD <5% at F=1KHz;
pre-amp gain = 0 dB;
PGA gain = 0 dB
Table15: Audio Output Characteristics
Parameter Conditions
load Resistance
Biasing voltage
Output swing
Voltage(single)
Normal
Output swing
Output(SPK1P/1N
Voltage(differential)
)
RL=32 Ohm
THD=0.1%
RL=32 Ohm
THD=1%
load Resistance
Biasing voltage
Output swing
Normal
Voltage(single)
Output(SPK2P/2N
Output swing
)
Voltage(differential)
RL=32 Ohm
THD=0.1%
RL=32 Ohm
THD=1%
SIM900D_Hardware Design_V1.04
Min Typ
1.2 1.5
200
1.2 2.2
15.9
740
Min Typ
27 32
1.4
- 91
- 96
27 32
1.4
- 91
- 96
43
Max Unit
2.0 V
500 uA
k Ohms
2.5 V
mVrms
mVrms
Max Unit
- Ohm
V
1.1V Vpp
2.2 Vpp
- mW
- mW
- Ohm
V
1.1V V
2.2 V
- mW
- mW
2010.10.09