CURRENT CONVERTER IC

AM402

analog microelectronics

April 99

8/8

TYPICAL TWO–WIRE APPLICATION (4–20mA)

Used in a two–wire circuit, pin 2 (VCC) is connected to pin 3 (RS–) and ground pin 14 (GND,

⊥) is

culated by

1

1

2

1

2

1

−

=

⇒

+

=

IA

IA

G

R

R

R

R

G

SET

IA

IN

OUT

I

R

G

V

I

+

=

0

I

V

R

R

RR

R

R

V

RI

SET

REF

REF

SET

=⋅

+

⇒=

−

22

1

0

4

34

3

40

equation

VI

R

SOUTmax

L

≥+6V

Example 3: Output current range 4...20mA

The values of the external devices ( V

200

K

mV , V

2

=

IA

G

) are as follows

Ω

Ω

Ω

Ω

Ω

Ω

Ω

µF

8

9

10

11

12

13

16

1

2

3

5

7

14

C

1

R

2

R

1

V

REF

R

0

V

S

V

IN

R

5

I

OUT

D

1

T

1

R

L

R

3

R

4

AM 402

5/10 V reference

IA

V

I

C

2

Ground

Figure 8

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for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licences to any of

the circuits described herein are implied or granted to any third party. Analog Microelectronics does not authorise or warrant any Analog Microelectronics product use in life support devices and/or

systems.