AD8206_12 Datasheet, PDF (11/16 Pages) Analog Devices – High Common-Mode Voltage, Bidirectional Current Shunt Amplifier

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 19). 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.
+IN
–IN
AD8206
V+
OUT
V_REF1
2.5V
VOLTAGE
REFERENCE
NC
NC = NO CONNECT
GND
V_REF2
Figure 19. External Referenced 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 20). 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.
AD8206
+IN
–IN
AD8206
V+
OUT
V_REF1
NC
NC = NO CONNECT
GND
V_REF2
Figure 20. Split Supply
SPLITTING AN EXTERNAL REFERENCE
In this case, an external reference is divided by 2 with an
accuracy of approximately 0.5% by connecting one VREF pin to
ground and the other VREF pin to the reference (see Figure 21).
+IN
–IN
AD8206
V+
OUT
V_REF1
5V
VOLTAGE
REFERENCE
NC
NC = NO CONNECT
GND
V_REF2
Figure 21. Split External Reference
Rev. B | Page 11 of 16