User Manual

MG260 Product Specification
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2.9.6 Audio interface
2.9.6.1 Microphone inputs
Internal audio filter c h aracter istic s
Frequency Gain
0-1 50 Hz < -22dB
15 0- 180 H z < -11dB
18 0- 200 H z < -3dB
20 0- 3700 Hz 0dB
>4000 Hz < -60dB
The gain of MIC inputs is internally adjusted and can be tuned from 30 dB to
51 dB using an AT command.
Input Gain Range dynamic is splitted into 2 subranges:
e Controller 1 (subra ng e from 30 to 51 dB )
e Controller 2 (subra ng e from –6 to 10 & 30 to 51)
Tables hereafter give the microphone gain versus maximum input voltage for
each input gain subrange.
Microphone gain vs Max input voltage ( using controller 1 )
Transmit Gain (dB) Max Vin (mVrms)
30 43.80
33 31.01
36 21.95
39 15.54
42 11
45 7.79
48 5.51
51 3.9