AD8417 查看數據表（PDF） - Analog Devices
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AD8417 Datasheet PDF : 16 Pages
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AD8417
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.
VS
AD8417
R4
R1
–IN
–
+IN
+
R2
R3
GND
OUT
VREF1
VREF2
2.5V
Figure 29. External Referenced Output
SPLITTING THE SUPPLY
By tying one reference pin to VS and the other to the ground pin,
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 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 increases
to 2.75 V.
Data Sheet
VS
AD8417
R4
R1
–IN
–
+IN
+
R2
R3
GND
OUT
VREF1
VREF2
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
reference by connecting one VREFx pin to ground and the other
VREFx pin to the reference (see Figure 31).
VS
AD8417
R4
R1
–IN
–
+IN
+
R2
R3
GND
OUT
VREF1
5V
VREF2
Figure 31. Split External Reference
Rev. 0 | Page 12 of 16
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