Input (V)

-10

-8

-6

-4

-2

0

2

4

6

8

10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

D001

28

INA188

SBOS632 – SEPTEMBER 2015

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Typical Application (continued)

8.2.2 Detailed Design Procedure

The following steps must be applied for proper device functionality:

•

For a 4-mA to 20-mA input, the maximum burden of 0.4 V must have a burden resistor equal to 0.4 / 0.02 =

20

Ω.

•

To center the output within the 0-V to 5-V range, VREF must equal 2.5 V.

•

To keep the ±20-mA input linear within 0 V to 5 V, the gain resistor (RG) must be 12.4 kΩ.

•

To keep the ±10-V input within the 0-V to 5-V range, attenuation must be greater than 0.05.

•

A 100-k

Ω resistor in series with a 4.87-kΩ resistor provides 0.0466 attenuation of ±10 V, well within the ±2.5-

V linear limits.

8.2.3 Application Curve

Figure 56. Plot of PLC Input Transfer Function