AD8417

Data Sheet

EXTERNAL REFERENCED OUTPUT

Tying both pins together and to a reference produces an output

equal to the reference voltage when there is no differential input

(see Figure 29). The output decreases the reference voltage when

the input is negative, relative to the −IN pin, and increases when

the input is positive, relative to the −IN pin.

–

+

R1

OUT

GND

AD8417

R2

R3

R4

–IN

+IN

2.5V

Figure 29. External Referenced Output

SPLITTING THE SUPPLY

the output is set at half of the supply when there is no differential

input (see Figure 30). The benefit of this configuration is that

an external reference is not required to offset the output for

bidirectional current measurement. Tying one reference pin

that is ratiometric to the supply, which means that if the supply

increases or decreases, the output remains at half the supply. For

example, if the supply is 5.0 V, the output is at half scale or 2.5 V.

If the supply increases by 10% (to 5.5 V), the output increases

to 2.75 V.

–

+

R1

OUT

GND

AD8417

R2

R3

R4

–IN

+IN

Figure 30. Split Supply

SPLITTING AN EXTERNAL REFERENCE

Use the internal reference resistors to divide an external reference

by 2 with an accuracy of approximately 0.5%. Split an external

–

+

R1

OUT

GND

AD8417

R2

R3

R4

–IN

+IN

5V

Figure 31. Split External Reference

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