33.3kW

33.3kW

Æ

1

Æ

2

Æ

2

Æ

1

Æ

2

Æ

2

Zer

-

Drift

Æ

Æ

1

Æ

1

OUT

REF2

REF1

GND

V+

V+

+IN

-

IN

See Note (1)

PRODUCT

GAIN

50V/V

100V/V

INA286

200V/V

INA283

500V/V

INA284

1000V/V

INA285

INA282

INA282, INA283

INA284, INA285

INA286

SBOS485A – NOVEMBER 2009 – REVISED JULY 2010

www.ti.com

REFERENCE PIN CONNECTION OPTIONS

Figure 33 illustrates a test circuit for reference divider accuracy. The output of the INA282 family can be

connected for unidirectional or bidirectional operation. Note that neither the REF1 pin nor the REF2 pin may be

connected to any voltage source lower than GND or higher than V+, and that the effective reference voltage

(REF1 + REF2)/2 must be 9V or less. This parameter means that the V+ reference output connection shown in

Figure 35 is not allowed for V+ greater than 9V. However, the split-supply reference connection shown in

Figure 37 is allowed for all values of V+ up to 18V.

(1) Reference divider accuracy is determined by measuring the output with the reference voltage applied to alternate reference resistors, and

calculating a result such that the amplifier offset is cancelled in the final measurement.

Figure 33. Test Circuit for Reference Divider Accuracy

14

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