Data Sheet

AD8417-2

OUTPUT OFFSET ADJUSTMENT

analog.com

Rev. 0 | 12 of 15

SPLITTING THE SUPPLY

By tying one reference pin to VS and the other to GND, 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 to VS and the other to GND

creates a mid-scale offset that is ratio-metric 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.

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 0.2%. Split an external

reference by connecting one VREFx pin to ground and the other

VREFx pin to the reference (see Figure 31).

Figure 31. Split External Reference