Q2406 Datasheet, PDF (28/81 Pages) List of Unclassifed Manufacturers – SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE

WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
2.12.1.1 Common microphone inputs characteristics
The connection can be either differential or single-ended but using a differential
connection in order to reject common mode noise and TDMA noise is strongly
recommended. When using a single-ended connection, be sure to have a very
good ground plane, a very good filtering as well as shielding in order to avoid
any disturbance on the audio path.
Internal audio filter characteristics
Frequency
Gain
0-150 Hz
< -22dB
150-180 Hz
< -11dB
180-200 Hz
< -3dB
200-3700 Hz
0dB
>4000 Hz
< -60dB
The gain of MIC inputs is internally adjusted and can be tuned from 30dB to
51dB using an AT command.
Microphone gain vs Max input voltage (using controller 1)
Transmit Gain (dB)
Max Vin (mVrms)
AT+VGT(*)
30
43.80
0 to 31
33
31.01
32 to 63
36
21.95
64 to 95
39
15.54
96 to 127
42
11
128 to 159
45
7.79
160 to 191
48
5.51
192 to 223
51
3.9
224 to 255
(*) control of the transmit gain by AT commands (for WISMO Quik Q24x6
Series driven by AT commands)
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