Table13: Mic Input Characteristics - SIM Tech SIM900D HD Manual

SIM900D Hardware Design

Table13: MIC Input Characteristics

Parameter
Working Voltage
Working Current
External Microphone Load Resistance
Internal biasing DC Characteristics
Differential input
THD
voltage
F=1KHz;
gain = 20 dB; PGA
gain = 14 dB
THD
F=1KHz;pre-amp
gain = 0 dB; PGA
gain = 0 dB
Table14: Audio Output Characteristics
Parameter Conditions
load Resistance
Biasing voltage
Output swing
Voltage(single)
Normal
Output(SPK1P/1N
Output swing
)
Voltage(differentia
l)
RL=32 Ohm
THD=0.1%
RL=32 Ohm
THD=1%
Normal
load Resistance
Output(SPK2P/2N
)
Biasing voltage
Output swing
Voltage(single)
Output swing
Voltage(differentia
l)
SIM900D_HD_V1.02
Min
1.2
200
1.2
<1% at
pre-amp
<5% at
Min
27
-
-
27
43
Typ Max
1.5 2.0
500
2.2
2.5
15.9
740
Typ Max
32 -
1.4
1.1V
2.2
91 -
96 -
32 -
1.4
1.1V
2.2
Unit
V
uA
k Ohms
V
mVrms
mVrms
Unit
Ohm
V
Vpp
Vpp
mW
mW
Ohm
V
V
V
09.04.2010