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AD8205 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD8205
Szczegółowy opis  Bidirectional, Zero Drift, Current Sense Amplifier
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD8205 Arkusz danych(HTML) 11 Page - Analog Devices

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Data Sheet
AD8418
OUTPUT OFFSET ADJUSTMENT
The output of the AD8418 can be adjusted for unidirectional or
bidirectional operation.
UNIDIRECTIONAL OPERATION
Unidirectional operation allows the AD8418 to measure currents
through a resistive shunt in one direction. The basic modes for
unidirectional operation are ground referenced output mode
and VS referenced output mode.
For unidirectional operation, the output can be set at the negative
rail (near ground) or at the positive rail (near VS) when the
differential input is 0 V. The output moves to the opposite rail
when a correct polarity differential input voltage is applied. The
required polarity of the differential input depends on the output
voltage setting. If the output is set at the positive rail, the input
polarity needs to be negative to move the output down. If the
output is set at ground, the polarity must be positive to move
the output up.
Ground Referenced Output
When using the AD8418 in this mode, both referenced inputs are
tied to ground, which causes the output to sit at the negative rail
when there are zero differential volts at the input (see Figure 27).
+
R1
OUT
GND
VS
VREF1
VREF2
AD8418
R2
R3
R4
–IN
+IN
Figure 27. Ground Referenced Output
VS Referenced Output
This mode is set when both reference pins are tied to the positive
supply. It is typically used when the diagnostic scheme requires
detection of the amplifier and the wiring before power is applied to
the load (see Figure 28).
+
R1
OUT
GND
VS
VREF1
VREF2
AD8418
R2
R3
R4
–IN
+IN
Figure 28. VS Referenced Output
BIDIRECTIONAL OPERATION
Bidirectional operation allows the AD8418 to measure currents
through a resistive shunt in two directions.
In this case, the output is set anywhere within the output range.
Typically, it is set at half-scale for equal range in both directions.
In some cases, however, it is set at a voltage other than half scale
when the bidirectional current is nonsymmetrical.
Adjusting the output is accomplished by applying voltage(s) to
the referenced inputs.
VREF1 and VREF2 are tied to internal resistors that connect to an
internal offset node. There is no operational difference between
the pins.
Rev. 0 | Page 11 of 16


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