Q2686 Wavecom, Q2686 Datasheet - Page 45

• Manufacturer Part Number: Q2686
• Description: Wireless CPU
• Manufacturer: Wavecom

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3.11.1.3 Auxiliary Microphone Inputs (MIC1)
By default, the MIC1 inputs are single-ended, but may be configured as
differential. An external biasing is needed if an electret microphone is used.
AC coupling is already embedded in the Wireless CPU
3.11.1.4 Microphone Electrical Characteristics
The characteristics of both Q2686 Wireless CPU
defined in the following tables.
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
Input voltage
Input voltage
single-ended
single-ended
Impedance
Impedance
•
•
Internal
Biasing
Internal
Biasing
MIC1N
MIC1P
Signal
*
**
The input voltage depends on the input microphone gain set by AT command.
Because MIC2P is internally biased, a coupling capacitor must be used to connect an
audio signal provided by an active generator. Only a passive microphone may be
directly connected to the MI2P and MIC2N inputs.
number
Absolute maximum ratings
Absolute maximum ratings
Differential Input Voltage *
Differential Input Voltage*
confidential ©
MIC2P (MIC2N left open)
MIC2N (MIC2P left open)
MIC1P (MIC1N left open)
MIC1N (MIC1P left open)
Parameter
Parameter
MIC2P (MIC2N = GND)
MIC2N (MIC2P = GND)
MIC1P (MIC1N = GND)
MIC1N (MIC1P = GND)
Pin
40
38
Internal AC coupling
Internal AC coupling
Output Current
Output Current
Voltage
Voltage
I/O
I
I
MIC1 pin description
MIC2 characteristics
MIC1 characteristics
I/O type
Analog
Analog
Microphone 1 negative input
Minim.
Microphone 1 positive input
1100
1100
Min.
900
900
70
70
70
70
2
0
0
®
Q2686 Wireless CPU
®
.
Description
microphone inputs are
1340
1340
1140
1140
100
Typ
Typ
100
100
100
100
100
N/A
N/A
2.1
Maxim.
6V **
1600
1400
1600
1400
Max.
346
162
162
162
162
346
2.2
1.5
6
Interfaces
mV
mV
Unit
Unit
mA
nF
nF
kΩ
kΩ
kΩ
kΩ
March 6, 2007
A
V
Ω
Ω
Ω
Ω
V
V
V
RMS
RMS
Page: 44 / 87
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