INA826 datasheet(16/33 Pages) TI

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8.3.1.1 Gain Drift

The stability and temperature drift of the external gain setting resistor (RG) also affects gain. The contribution of

RG to gain accuracy and drift is determined from Equation 2.

The best gain drift of 5 ppm/

℃ (maximum) is achieved when the INA823 uses G = 1 V/V without RG connected.

In this case, gain drift is limited by the slight mismatch of the temperature coefficient of the integrated 50-kΩ

resistors in the differential amplifier (A3).

At gains greater than 1 V/V, gain drift increases as a result of the individual drift of the 50-kΩ resistors in the

feedback of A1 and A2 relative to the drift of the external gain resistor (RG.) The low temperature coefficient of

the internal feedback resistors significantly improves the overall temperature stability of applications using gains

greater than 1 V/V over alternate options.

8.3.2 Input Common-Mode Voltage Range

The linear input voltage range of the INA823 input circuitry extends within 2 V of power supplies and maintains

excellent common-mode rejection throughout this range. The common-mode range for the most common

operating conditions are shown in Input Common-Mode Voltage vs Output Voltage. The common-mode range for

other operating conditions is best calculated using the Analog Engineers Calculator.

Output Voltage (V)

0.5

1.5

2.5

3.5

4.5

0.5

1.5

2.5

3.5

4.5

VREF = 0 V

VREF = 2.5 V

VS = 5 V, G = 1

Figure 8-2. Input Common-Mode Voltage

vs Output Voltage

Output Voltage (V)

0.5

1.5

2.5

3.5

4.5

0.5

1.5

2.5

3.5

4.5

VREF = 0 V

VREF = 2.5 V

VS = 5 V, G = 100

Figure 8-3. Input Common-Mode Voltage

vs Output Voltage

G = 1, VREF = 0 V

Figure 8-4. Input Common-Mode Voltage

vs Output Voltage

G > 10, VREF = 0 V

Figure 8-5. Input Common-Mode Voltage

vs Output Voltage

A single-supply instrumentation amplifier has special design considerations. To achieve a common-mode

range that extends to single-supply ground, the INA823 employs a current-feedback topology with PNP input

INA823

SBOSA75A – JULY 2021 – REVISED JULY 2021

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