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Integra M2106+

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WA_DEV_M2106+_PTS_003-001 April, 2007

The MIC1 inputs are differential and do not include internal bias. These inputs are the standard for an

external headset or a hands-free kit.

To use these inputs with an electret microphone, bias has to be generated outside the Wireless CPU

according to the characteristics of this electret microphone.

These inputs are provided either for an external headset or a hands-free kit.

The input impedance is around 10kΩ +/- 30% between 400Hz and 4000Hz.

AC coupling is already embedded in the Wireless CPU

Pin description

Signal Pin # I/O Reset state I/O type Description

MIC1P 20 I High Z Analog Microphone 1 positive input

MIC1N 22 I High Z Analog Microphone 1 negative input

Differential connection

MIC1P

MIC1N

Vcc

Figure 13: MIC1 differential connection

Vcc = 2.8 V from the analog power supply.

R1 = R4 = from 100 to 330 Ω.

R2 = R3 =1 kΩ to 3.3 kΩ according to the microphone characteristics.

CM = 22 pF to 100 pF.

C2 = 47 µF

R1 and R4 are used as a voltage supply filter with C2.

CM must be as close to the microphone as possible. Microphone manufacturers provide this capacitor

directly soldered on the microphone.

3.9.2 Speaker Outputs

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Wavecom Integra M2106+ Specifiche Pagina 36