AD8205

Data Sheet

Rev. | Page 10 of 12

EXTERNAL REFERENCE OUTPUT

Tying both pins together and to a reference produces an output

at the reference voltage when there is no differential input (see

Figure 16). 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.

AD8205

+IN

–IN

NC

NC = NO CONNECT

GND

V+

OUT

2.5V VOLTAGE

REFERENCE

Figure 16. External Reference Output

SPLITTING THE SUPPLY

By tying one reference pin to V+ and the other to the ground

pin, the output is set at half of the supply when there is no

differential input (see Figure 17). The benefit is that no external

reference is required to offset the output for bidirectional

current measurement. This 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.

AD8205

+IN

–IN

NC

NC = NO CONNECT

GND

V+

OUT

Figure 17. Split Supply

SPLITTING AN EXTERNAL REFERENCE

In this case, an external reference is divided by 2 with an

AD8205

+IN

–IN

NC

NC = NO CONNECT

GND

V+

OUT

5V

VOLTAGE

REFERENCE

Figure 18. Split External Reference

D