INA159 datasheet(24/51 Pages) TI2

24 / 51 page

+15V

5.49kW

Device

REF

OUT

- 15V

=10kW

S+

=9.9kW

S-

=1V

DIFF

=10V

SignalBandwidth:5kHz

INA826

SBOS562G – AUGUST 2011 – REVISED JUNE 2020

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8.3.9 Operating Voltage

The INA826 operates over a power-supply range of 3 V to 36 V (±1.5 V to ±18 V). Supply voltages higher than

40 V (±20 V) can permanently damage the device. Parameters that vary over supply voltage or temperature are

shown in the Typical Characteristics section of this data sheet.

8.3.9.1 Low-Voltage Operation

The INA826 can operate on power supplies as low as ±1.5 V. Most parameters vary only slightly throughout this

supply voltage range; see the Typical Characteristics section. Operation at very-low supply voltage requires

careful attention to make sure that the input voltages remain within the linear range. Voltage swing requirements

of internal nodes limit the input common-mode range with low power-supply voltage. Figure 9 through Figure 15

and Figure 41 through Figure 43 describe the range of linear operation for various supply voltages, reference

connections, and gains.

8.3.10 Error Sources

Most modern signal-conditioning systems calibrate errors at room temperature. However, calibration of errors

that result from a change in temperature is normally difficult and costly. Therefore, minimizing these errors is

important. Make sure to choose high-precision components, such as the INA826, that have improved

specifications in critical areas that impact the precision of the overall system. Figure 62 shows an example

application.

Figure 62. Example Application With G = 10 V/V and 1-V Differential Voltage

Resistor-adjustable INAs, such as the INA826, show the lowest gain error in G = 1 because of the inherently

well-matched drift of the internal resistors of the differential amplifier. At gains greater than 1 (for instance, G =

10 V/V or G = 100 V/V), the gain error becomes a significant error source because of the contribution of the

resistor drift of the 24.7-kΩ feedback resistors in conjunction with the external gain resistor. Except for very high

gain applications, the gain drift is by far the largest error contributor compared to other drift errors, such as offset

drift.

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