INA180A2IDBVT datasheet(26/51 Pages) TI1

26 / 51 page

Time (500 µs/div)

Output

Ground

0 V

Total Error (%) =

Total Gain Error (%) + Total Offset Error (%)

INA180, INA2180, INA4180

SBOS741G – APRIL 2017 – REVISED APRIL 2020

www.ti.com

Product Folder Links: INA180 INA2180 INA4180

Submit Documentation Feedback

One method of calculating the total error is to add the gain error to the percentage contribution of the offset error.

However, in this case, the gain error and the offset error do not have an influence or correlation to each other. A

more statistically accurate method of calculating the total error is to use the RSS sum of the errors, as shown in

Equation 7:

(7)

After applying Equation 7, the total current sense error at maximum current is calculated to be 1.25%, and that is

less than the design example requirement of 1.5%.

The INA180A4 (gain = 200) also has a bandwidth of 105 kHz that meets the small-signal bandwidth requirement

of 80 kHz. If higher bandwidth is required, lower-gain devices can be used at the expense of either reduced

output voltage range or an increased value of RSENSE.

9.2.3 Application Curve

Figure 48 shows an example output response of a unidirectional configuration. The device output swing is limited

by ground; therefore, the output is biased to this zero output level. The output rises above ground for positive

differential input signals, but cannot fall below ground for negative differential input signals.

Figure 48. Output Response

INA180A2IDBVT Datasheet(PDF) 26 Page - Texas Instruments