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Vi
C1 100 µF
Ip
10
µF
C15
220
µF
Vi
13
IR
16
VCC
R16
392 Ω
R1
620 Ω
1
LN
QR− 4
9
MIC+
8
MIC−
12
DTMF
TEA1064B
QR+ 5
R4
100
GAR 6 kΩ
14
MUTE
15
PD
2
GAS1
R7
68
7
DLS/MMUTE
3 kΩ
GAS2
VEE2 VEE1 REG AGC STAB SLPE
19 11 17 18 10 20
C16
470 nF
C3
R5
4.7 R6 3.6 R9
µF
kΩ 20 Ω
100 µF
RL
600 Ω
C4
100 pF
C7 1 nF
C6
100 pF
Iline
Vo
11 to
140 mA
MBA443
For measuring gain from MIC+ and MIC− the MUTE input should be LOW or open-circuit.
For measuring the DTMF input, the MUTE input should be HIGH.
Inputs not being tested should be open-circuit.
Fig.20 Test circuit for defining voltage gain of MIC−, MIC+ and DTMF inputs; voltage gain (Gv) is defined as 20log Vo/Vi.