AD8210(Rev0) データシートの表示（PDF） - Analog Devices

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AD8210
(Rev.:Rev0)

High Voltage, Bidirectional Current Shunt Monitor

Analog Devices 

MODES OF OPERATION

The AD8210 can be adjusted for unidirectional or bidirectional

operation.

UNIDIRECTIONAL OPERATION

Unidirectional operation allows the AD8210 to measure

currents through a resistive shunt in one direction. The basic

modes for unidirectional operation are ground referenced

output mode and V+ referenced output mode.

In unidirectional operation, the output can be set at the negative

rail (near ground) or at the positive rail (near V+) when the

differential input is 0 V. The output moves to the opposite rail

when a correct polarity differential input voltage is applied. In

this case, full scale is approximately 250 mV. The required

polarity of the differential input depends on the output voltage

setting. If the output is set at ground, then the polarity needs to

be positive to move the output up (see Table 5). If the output is

set at the positive rail, then the input polarity needs to be

negative to move the output down (see Table 6).

Ground Referenced Output

When using the AD8210 in this mode, both reference inputs

are tied to ground, which causes the output to sit at the negative

rail when the differential input voltage is zero (see Figure 27

and Table 4).

RS

+IN

–IN

VS

AD8210

0.1µF

GND

VREF1

G = +20

VREF2

OUTPUT

Figure 27. Ground Referenced Output

Table 4. V+ = 5 V

VIN (Referred to −IN)

0V

250 mV

VO

0.05 V

4.9 V

AD8210

V+ 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 wiring before power is

applied to the load (see Figure 28 and Table 5).

RS

+IN

–IN

VS

AD8210

0.1µF

VREF1

G = +20

OUTPUT

GND

VREF2

Figure 28. V+ Referenced Output

Table 5. V+ = 5 V

VIN (Referred to −IN)

0V

−250 mV

VO

4.9 V

0.05 V

BIDIRECTIONAL OPERATION

Bidirectional operation allows the AD8210 to measure currents

through a resistive shunt in two directions. The output offset

can be set anywhere within the output range. Typically, it is set

at half scale for equal measurement range in both directions. In

some cases, however, it is set at a voltage other than half scale

when the bidirectional current is nonsymmetrical.

Table 6. V+ = 5 V, VO = 2.5 V with VIN = 0 V

VIN (Referred to –IN)

+125 mV

−125 mV

VO

4.9 V

0.05 V

Adjusting the output can also be accomplished by applying

voltage(s) to the reference inputs.

Rev. 0 | Page 11 of 16

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