INA181A4 datasheet(26/62 Pages) TI2

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With the adjustment factor from Equation 5, including the device internal input resistance, this factor varies with

each gain version, as shown in Table 8-1. Each individual device gain error factor is shown in Table 8-2.

Table 8-1. Input Resistance

PRODUCT

GAIN

RINT (kΩ)

INAx181A1

INAx181A2

INAx181A3

100

INAx181A4

200

2.5

Table 8-2. Device Gain Error Factor

PRODUCT

SIMPLIFIED GAIN ERROR FACTOR

INAx181A1

25000

(21 R ) 25000

INAx181A2

10000

(9 R ) 10000

INAx181A3

1000

INAx181A4

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 6:

Gain Error (%) = 100

(100

Gain Error Factor)

(6)

For example, using an INA181A2 and the corresponding gain error equation from Table 8-2, a series resistance

of 10 Ω results in a gain error factor of 0.991. The corresponding gain error is then calculated using Equation 6,

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

INA181, INA2181, INA4181

SBOS793H – APRIL 2017 – REVISED NOVEMBER 2023

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INA181A4 Datasheet(PDF) 26 Page - Texas Instruments