Industrial Converter and Protector IC

AM460

analog microelectronics

April 2003

14/18

Typical 2-wire application with an input signal referenced to ground

SET

I

INP

OUT

I

R

G

V

I

+

⋅

=

0

8

with

2

1

1

R

R

G

G

GAIN

I

+

=

=

and

4

3

4

0

2

R

R

R

R

V

I

REF

SET

+

⋅

=

Example 4:

way that the output current has a range of 4...20mA.

mA

4

8

8

0

0

+

⋅

=

+

⋅

=

R

G

V

I

R

G

V

I

GAIN

INP

SET

I

INP

OUT

15

.

22

1

mA

4

27

2

V

5

1

2

0

4

3

≈

−

⋅

Ω

⋅

=

−

=

SET

REF

I

R

V

R

R

and thus the following value for the gain to be set:

Ground

T

1

D

1

R

5

R

L

1

Single-ended

input voltage

1

2

AM460

OP3

OP2

R

1

R

2

4

OP1

5

3

R

3

C

1

Voltage Reference

R

0

714

6

13

15

16

IC ground: GND

System ground: Ground

potentials!

GND

2-wire

connection

C

2

12

8

9

11

10

V

R

4

I

V

INP

V

S

I

OUT

V

BG

Connections setting unused function blocks to a defined operating point

Figure 8: Typical 2-wire application for input signals referenced to ground