Q2406B WAVECOM, Q2406B Datasheet - Page 31
Manufacturer Part Number
Specifications of Q2406B
18.104.22.168 Auxiliary Microphone Inputs (MIC1)
The MIC1 inputs are differential and do not include internal bias. To use these
inputs with an electret microphone, bias has to be generated outside the
WISMO Quik Q24x6 Series module according to the characteristic of this
electret microphone. These inputs are the standard ones used for an external
headset or a handsfree kit.
AC coupling is already embedded in the module.
Impedance of the microphone input in differential mode :
Module ON : R
= 10KΩ +/-10%
Module OFF : R
Figure 4 : MIC1 inputs (differential connection)
R1 = R4 = from 100 to 330Ω
R2 = R3 = usually between 1KΩ and 3.3KΩ as per the microphone
C1 = 10pF to 33pF
C2 = C3 = C4 = 47pF to 100pF
C5 = 47µF
L1 = L2 = 100nH
R1 and R4 are used as a voltage supply filter with C5.
manufacturers provide this capacitor directly soldered on the microphone.
C2 has to be very close to the WISMO Quik Q24x6 Series connector.
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WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
Page : 31 / 81