Specifications

Integra M2106+
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WA_DEV_M2106+_PTS_003-001 April, 2007
Table 2: Microphone gain vs Max input voltage*
Using Controller 1 Using Controller 2
Transmit Gain (dB) Max Vin (mVrms) Transmit Gain (dB) Max Vin (mVrms)
+ 30 43.80 -6.5 3031
+ 33 31.01 -6 2861
+ 36 21.95 0 1434
+ 39 15.54 +9.5 480
+ 42 11.00 +10 454
+ 45 7.79 +30.3 43.80
+ 48 5.51 +30.8 41.36
+ 51 3.90 +50.8 41.14
- - +51.3 3.90
* For further details, refer to the AT commands documentation [7]
3.9.1.2 Main Microphone Inputs (MIC2)
The MIC2 inputs are differential ones. They already include the convenient biasing for an electret
microphone (1 mA and 2 volts). This electret microphone may be directly connected to these inputs. The
impedance of the microphone on MIC2 must be around 2 kΩ.
These MIC2 characteristics are the standard for a handset design.
The input impedance is around 1.4kΩ +/- 20% between 400Hz and 4000Hz.
AC coupling is already embedded in the Wireless CPU
®
.
CM
MIC2N
MIC2P
Figure 12: MIC2 input connection
CM = 22 pF to 100 pF; 33 pF recommended
CM must be as close to the microphone as possible. Microphone manufacturers provide this capacitor
directly soldered on the microphone.
Pin description
Signal Pin # I/O Reset state I/O type Description
MIC2P 16 I High Z Analog Microphone 2 positive input
MIC2N 18 I High Z Analog Microphone 2 negative input
3.9.1.3 Auxiliary Microphone Inputs (MIC1 Inputs)