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Enfora Enabler IIIG M2M
Modem Integration Guide
6.6.17. Headset Microphone Input (Pin 55)
Mic Input
Parameter/Conditions
Min
Typ
Max
Units
The headset differential
inputs HSMIC and AUXI
can be amplified by the
differential handset
microphone amplifier.
This amplifier has two
different gains 4.9 dB or
25.6 dB and a bias
generator HSMICBIAS
provides an external
voltage of 2 V or 2.5 V to
bias the microphone.
Headset Mic Input
Maximum Input Range
Inputs 3 dBm0 (Maximum
digital sample amplitude with
PGA gain set to 0 dB),
AUXAMP
gain = 18 dB, Single
HSMIC
78
mV
RMS
Nominal Ref. Level
-10
dBm0
Microphone Pre-
Amplifier Gain
18
dB
Input resistance at
HSMIC
HSMIC single input,
AUXAMP
gain = 18 dB
40.5
k
Ω
6.6.18. Headset Microphone Bias Output (Pin 53)
Mic Bias Output
Parameter/Conditions
Min
Typ
Max
Units
Bias Voltage on Mic(+)
Set to 2.0 V
1.9
2.1
Vdc
Set to 2.5 V
2.4
2.6
Vdc
Mic Bias Current
Capability
2.0
mA
GSM0308IG002
52
Version 1.05 – 11/13/08