GL6962/GL6962A

8

Test Circuit

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.

4

5

7

6

C1

+ 100•F

+

10•F

C3

4.7•F

+

R5

3. 6k

¥ Ø

C8

1 nF

R1

620¥ Ø

C7

1 nF

C4

100pF

R4

100k¥ Ø

100•F

+

600¥ Ø

10 to

140mA

R9

20¥ Ø

C6

100pF

R7

68k¥ Ø

R6

1

10

16

2

3

14

15

8

9

13

11

12

IR

QR

RGA

MIC+

MIC-

SLPE

TGA1

TGA2

REG

AGC

DTMF

LN

GL6962A

MUTE

Vi