Figure 12: Mic2 Input Connection; This Document Is The Sole And Exclusive Property Of Wavecom. Not To Be Distributed Or Divulged Without Prior Written; Agreement - Wavecom Integra M2106+ Product Specification

Using Controller 1
Transmit Gain (dB) Max Vin (mVrms) Transmit Gain (dB) Max Vin (mVrms)
+ 30
+ 33
+ 36
+ 39
+ 42
+ 45
+ 48
+ 51
-
* 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 = 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.
Signal Pin #
MIC2P 16
MIC2N 18
3.9.1.3 Auxiliary Microphone Inputs (MIC1 Inputs)
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This document is the sole and exclusive property of Wavecom. Not to be distributed or divulged without prior written

agreement.

WA_DEV_M2106+_PTS_003-001
Table 2: Microphone gain vs Max input voltage*
43.80
31.01
21.95
15.54
11.00
7.79
5.51
3.90
-

Figure 12: MIC2 input connection

Pin description
I/O Reset state
I High Z
I High Z
Using Controller 2
-6.5
-6
0
+9.5
+10
+30.3
+30.8
+50.8
+51.3
®
.
M IC2 P
CM
M IC2 N
I/O type
Analog Microphone 2 positive input
Analog Microphone 2 negative input
Integra M2106+
Erreur ! Style non défini.
3031
2861
1434
480
454
43.80
41.36
41.14
3.90
Description
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April, 2007