Integra M2106+
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WA_DE_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 k
Ω
.
These MIC2 characteristics are the standard for a handset design.
The input impedance is around 1.4k
Ω
+/- 20% between 400Hz and 4000Hz.
AC coupling is already embedded in the Wireless CPU
®
.
CM
M IC2 N
M IC2 P
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)
