®

INA120

9

A

3

A

1

A

2

1

18

2

12

7

6

3

4

5

8

9

10

11

17

13

16

15

14

V

IN

V–

V+

10k

Ω

±10mV

Ω

100

Ω

100

V–

V+

100µA

1/2 REF200

100µA

1/2 REF200

OPA27

V+

Ω

100k

V

O

G = 10

1

R

Input Stage Offset Adjustment for High Gains (see text).

Output Offset Adjustment

for low gains (see text).

INA120

INA120

INA120

Microphone,

Hydrophone

etc.

Ω

47k

Ω

47k

Thermocouple

Ω

10k

Center-tap provides

bias current return.

FIGURE 6. Input Protection Circuit.

R

current to 100mA.

INA120

R

S

R

S

V–

V+

Diodes:1N4148

FIGURE 4. Offset Adjustment Circuits.

FIGURE 5. Providing an Input Bias Current Path.