Table of Contents
Advertisement
16
15
18
17
st
3.9.1 1
Audio Channel: Microphone
This channel is the G610 power-up default active audio channel.
The microphone input includes all the necessary circuitry to support a direct connection to an
external microphone device. It incorporates an internal bias voltage which can be adjusted by AT
command. It has an impedance of 2 kΩ.
The bias voltage would be supplied after a voice call establish.
Parameter
Bias Voltage
Gain
AC Input
Impedance
st
3.9.2 1
Audio Channel: Speaker
This channel is the G610 power-up default active output for voice calls and DTMF tones. It is
designed as a differential output with 32Ω impedance.
Parameter
Output Voltage
AC Output
Impedance
DC Voltage
nd
3.9.3 2
Audio Channel: Microphone
This channel is switched on by AT Command.
The microphone input includes all the necessary circuitry to support a direct connection to an
external microphone device. It incorporates an internal bias voltage which can be adjusted by AT
G610 GPRS Module Hardware User Manual
EAR-
EAR+
Output is balanced and can directly operate an head set
AUXO+
Output is balanced and can directly operate an hand
AUXO-
Conditions
Min
1.8
No load
Programmable
in 3 dB steps
Conditions
Min
No load Single
ended
1st Audio channel
2nd Audio channel
free speaker
Typ
Max
2.0
2.2
0
45
2
Typ
Max
200
32
1.38
Unit
V
dB
kΩ
Unit
mVPP
Ω
V
Page 28 of 47
Advertisement
Table of Contents
