®

* As shown channels 0 and 1 may be used for auto offset zeroing, and gain calibration respectively.

FIGURE 11. Multiple Channel Precision Instrumentation Amplifier with Programmable Gain.

FIGURE 12. 4mA to 20mA Bridge Transmitter Using Single Supply Instrumentation Amplifier.

INA102

10

13

9

11

–15V

–15V

PGA102

15

1

2

3

4

5

e

OUT

G = 1, 10, 100

+15V

16

x10

x100

Gain Select

6

7

8

G = 1

12

7

6

+In

–In

15

14

–15V

+15V

+15V

D

D

–15V

+15V

D

D

10k

Ω

10k

Ω

∆e

IN

Input Protection: D = FDH300 (Low Leakage)

FIGURE 13. Programmable-Gain Instrumentation Amplifier Using the INA102 and PGA102.

INA102

INA102

INA102

INA102

PGA100

IN7

IN6

IN5

IN4

IN3

IN2

IN1

IN0

INA102

V

REF

*

e

OUT

Control

Logic

Channel

Select

Gain

Select

CP

CE

e

2

e

4

e

6

e

5

INA102

e

3

e

1

INA102

15

3

7

6

14

15

12

4

3

5

XTR110

1

13

14

10

9

2

GS

D

4mA to 20mA

V

L

R

L

OPA27

+6V

40k

Ω

60k

Ω

12

11

+24V

300

Ω

9

10

+10V

REF

±40mV

G = 100

+2V to +10V

+24V

2N3055

–40

40

20

16

4

0

V

16