Audio Interface; Table 16: Audio Parameters Caracteristics; Table 17: Microphone Inputs Internal Audio Filter Characteristics; Table 18: Recommended Characteristics For The Microphone - Wavecom FASTRACK M1306B User Manual

8.2.2 Audio Interface

The audio interface is available through the Sub HD 15-pin connector.
Audio parameters
Microphone input current @2 V/2 kΩ
Absolute microphone input voltage
Speaker output current 150 Ω //1 nF
Absolute speaker impedance
Impedance of the
output in differential mode

Table 17: Microphone inputs internal audio filter characteristics

Table 18: Recommended characteristics for the microphone:

Feature
Type
Impedance
Sensitivity
SNR
Frequency response
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Table 16: Audio parameters caracteristics

speaker amplifier
Frequency
0-150 Hz
150-180 Hz
180-200 Hz
200-3700 Hz
>4000 Hz
Electret 2 V / 0.5 mA
Z = 2 kΩ
-40 dB to –50 dB
> 50 dB
compatible with the GSM specifications
Fastrack M1306B User Guide
Technical Characteristics
Min Typ Max
0.5
100
16
32 50
1
Gain
< -22 dB
< -11 dB
< -3 dB
0 dB
< -60 dB
Value
Unit Comments
mA
mVpp AC voltage
mA
Ω
Ω +/-10 %
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November 11, 2006