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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior
written agreement.
WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
Electrical Characteristics of MIC2
Parameters
Min
Typ
Max
Unit
MIC2+
2
2.1
2.2
V
Output current
0.5
1.5
mA
Internal biasing
DC Characteristics
R2
1650 1900 2150
Ω
Z2 MIC2P
(MIC2N=Open)
Z2 MIC2N
(MIC2P=Open)
1.1
1.3
1.6
Z2 MIC2P
(MIC2N=GND)
Z2 MIC2N
(MIC2P=GND)
0.9
1.1
1.4
AC Characteristics
200 Hz<F<4 kHz
Impedance
between MIC2P
and MIC2N
1.3
1.6
2
k
Ω
AT+VGT*=3500
(4)
13.8 18.6
***
AT+VGT*=2000
(4)
77.5 104***
Working voltage
( MIC2P-MIC2N)
AT+VGT*=700
(4)
346
466***
mVrms
Positive
+7.35**
Maximum rating
voltage
(MIC2P or MIC2N)
Negative
-0.9
V
•
*The input voltage depends of the input micro gain set by AT command. Please refer to the
document : AT command User Guide[7]
•
**Because MIC2P is internally biased, it is necessary to use a coupling capacitor to
connect an audio signal provided by an active generator. Only a passive microphone can
be directly connected to the MIC2P and MIC2N inputs.
•
*** This value is obtained with digital gain = 0 and for frequency = 1kHz ..
•
(4) This value is given in dB, but it’s possible to toggle to index value. Please refer to the
document :AT command User Guide [7]
WARNING:
The voltage input value for MIC2 can’t exceed the maximum working voltage,
otherwise clipping will appear.
