AD8418

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 moves down from the reference

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

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

–

+

R1

OUT

GND

AD8418

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 is that an external reference

is not required to offset the output for bidirectional current

the ground pin creates a midscale offset 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 goes to 2.75 V.

–

+

R1

OUT

GND

AD8418

R2

R3

R4

–IN

+IN

Figure 30. Split Supply

SPLITTING AN EXTERNAL REFERENCE

The internal reference resistors can be used to divide an external

reference by 2 with an accuracy of approximately 0.5%. Splitting

–

+

R1

OUT

GND

AD8418

R2

R3

R4

–IN

+IN

5V

Figure 31. Split External Reference

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