With the adjustment factor from Equation 1 including the device internal input resistance, this factor varies with

each gain version, as shown in Table 6-1. Table 6-2 lists each individual device gain-error factor.

Table 6-1. Input Resistance

PRODUCT

GAIN

RINT (kΩ)

INA210-Q1

200

5

INA211-Q1

500

2

INA212-Q1

1000

1

INA213-Q1

50

20

INA214-Q1

100

10

INA215-Q1

75

13.3

Table 6-2. Device Gain Error Factor

PRODUCT

SIMPLIFIED GAIN ERROR FACTOR

INA210-Q1

1000

R

+ 1000

S

INA211-Q1

10,000

(13

R

+ 10,000

´

S)

INA212-Q1

5000

(9

R

+ 5000

´

S)

INA213-Q1

20,000

(17

R

+ 20,000

´

S)

INA214-Q1

10,000

(9

R

+ 10,000

´

S)

INA215-Q1

8,000

(7 RS) + 8,000

x

Use Equation 2 to calculate the gain error that can be expected from the addition of the external series resistors.

Gain Error (%) = 100

(100

Gain Error Factor)

-

´

(2)

For example, using an INA212-Q1 device and the corresponding gain error equation from Table 6-2, a series

resistance of 10 Ω results in a gain error factor of 0.982. The corresponding gain error is then calculated using

Equation 2, resulting in a gain error of approximately 1.77% solely because of the external 10-Ω series resistors.

Using an INA213-Q1 with the same 10-Ω series resistor results in a gain error factor of 0.991 and a gain error of

0.84% again solely because of these external resistors.

INA210-Q1, INA211-Q1, INA212-Q1, INA213-Q1, INA214-Q1, INA215-Q1

SBOS475K – MARCH 2009 – REVISED NOVEMBER 2023

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14

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