GL6962/GL6962A
Test Circuit
I
line
R1
620¥
Ø
1
V
O
10
LN
13
V
CC
100•F
+
IR
4
QR
C4
100pF
5
RGA
C7
1 nF
MIC+
7
11
DTMF
R4
100k¥
Ø
R
L
600¥
Ø
GL6962A
MUTE
12
C1
+ 100•F
10 to
140mA
V
i
MIC-
6
SLPE
16
TGA1
2
TGA2
3
REG
14
AGC
15
I
ref
8
V
EE
9
+
10•F
Vi
C6
100pF
R9
20¥
Ø
R7
68k¥
Ø
C8
1 nF
C3
4.7•F
+
R6
R5
3. 6k
¥ Ø
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. 1 Test circuit for defining GL6962 voltage gain of MIC+, MIC- and DTMF inputs.
(Voltage gain is defined as G
V
= 20log |V
o
/V
i
|
8