User's Manual

WM_PRJ_Q2400_PTS_002 - 004
March 5, 2004
2.13.1.2 Main Microphone Inputs (MIC2)
The MIC2 inputs are differential ones. They already include the convenient biasing for an electret
microphone (0.5 mA and 2 Volts). This electret microphone can be directly connected on these
inputs.
The impedance of the microphone 2 has to be around 2 kΩ. These inputs are the standard ones for
an handset design while MIC1 inputs can be connected to an external headset or a hands-free kit.
AC coupling is already embedded in the module.
Pin description
Signal Pin # I/O I/O type Description
MIC2P 46 I Analog Microphone 2 positive input
MIC2N 48 I Analog Microphone 2 negative input
2.13.1.3 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 sub-series module according
to the characteristic of this electret microphone. These inputs are the standard ones used for an
external headset or a hands-free kit.
The impedance of the microphone 1 has to be around 2 kΩ. These inputs are provided for an
external headset or a hands-free kit.
AC coupling is already embedded in the module.
Pin description
Signal Pin # I/O I/O type Description
MIC1P 42 I Analog Microphone 1 positive input
MIC1N 44 I Analog Microphone 1 negative input
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