The INAx290 gain error is < 0.1% at room temperature for most gain options, with a maximum drift of 5 ppm/°C over the full temperature range of –40°C to +125°C. The INAx290 is available in multiple gain options of 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V, which is selected based on the desired signal-to-noise ratio and other system requirements of the design.

The INAx290 closed-loop gain is set by a precision, low-drift internal resistor network. The ratio of these resistors are excellently matched, although the absolute values can vary significantly. TI does not recommend adding additional resistance around the INAx290 to change the effective gain because of this variation. Table 7-1 describes the typical values of the internal gain resistors seen in the functional diagram above.