INA180B2 datasheet(24/53 Pages) TI2

24 / 53 page

With the adjustment factor from Equation 4, including the device internal input resistance, this factor varies with

each gain version, as shown in Table 9-1. Each individual device gain error factor is shown in Table 9-2.

Table 9-1. Input Resistance

PRODUCT

GAIN

RINT (kΩ)

INAx180A1

INAx180A2

INAx180A3

100

INAx180A4

200

2.5

Table 9-2. Device Gain Error Factor

PRODUCT

SIMPLIFIED GAIN ERROR FACTOR

INAx180A1

25000

(21 R ) 25000

INAx180A2

10000

(9 R ) 10000

INAx180A3

1000

INAx180A4

2500

(3 R ) 2500

The gain error that can be expected from the addition of the external series resistors can then be calculated

based on Equation 5:

Gain Error (%) = 100

(100

Gain Error Factor)

(5)

For example, using an INA180A2 and the corresponding gain error equation from Table 9-2, a series resistance

10 Ω results in a gain error factor of 0.991. The corresponding gain error is then calculated using Equation 5,

resulting in an additional gain error of approximately 0.89% solely because of the external 10-Ω series resistors.

INA180, INA2180, INA4180

SBOS741H – APRIL 2017 – REVISED JULY 2022

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INA180B2 Datasheet(PDF) 24 Page - Texas Instruments