WM_PRJ_M13_UGD_001 - 001
20th July 2004
© 2004
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Wavecom Confidential & Proprietary Information
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8.2.2 Audio interface
The audio interface is available through the Sub HD 15-pin connector.
Audio parameters Min Typ Max Unit Comments
Microphone input current @2 V/2 k
Ω
0.5 mA
Absolute microphone input voltage 100 mVpp
AC voltage
Speaker output current 150
Ω
//1 nF
16 mA
Absolute speaker impedance 32 50
Ω
Impedance of the speaker amplifier
output in differential mode
1
Ω
+/-10 %
Microphone inputs internal audio filter characteristics
Frequency Gain
0-150 Hz < -22 dB
150-180 Hz < -11 dB
180-200 Hz < -3 dB
200-3700 Hz 0 dB
>4000 Hz < -60 dB
Recommended characteristics for the microphone
:
Feature Value
Type Electret 2 V / 0.5 mA
Impedance
Z = 2 k
Ω
Sensitivity -40 dB to –50 dB
SNR > 50 dB
Frequency response compatible with the GSM specifications
Recommended characteristics for the speaker
:
Feature Value
Type 10 mW, electro-magnetic
Impedance
Z = 32 to 50
Ω
Sensitivity 110 dB SPL min. (0 dB = 20 µPa)
Frequency response compatible with the GSM specifications
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