GL6962/GL6962A
Iline
100•F
VO
+
RL
600¥ Ø
R4
100k¥ Ø
C4
100pF
C7
1 nF
10 to
Vi
140mA
1
10
LN
IR
4
QR
R1
620¥ Ø
13
VCC
5
RGA
GL6962A
MIC+
7
MIC-
6
SLPE TGA1 TGA2 REG AGC
Iref
11
DTMF
12
MUTE
+
10•F
VEE
16
2
3
14
15
8
9
C6
100pF
R7
68k¥ Ø
C3
4.7•F
+
R9
C8
20¥ Ø
1 nF
R6
R5
3. 6k
¥Ø
C1
+ 100•F
For measuring gain from MIC+ and MIC-, the MUTE input should be HIGH.
For measuring the DTMF input, the MUTE input should be LOW or open-circuit.
Inputs not being tested should be open-circuit.
Fig. 2 Test circuit for defining GL6962A voltage gain of MIC+, MIC- and DTMF inputs.
(Voltage gain is defined as GV = 20log |Vo/Vi|
9