Gain Error (%) = 100

(100

Gain Error Factor)

-

´

8,000

x

10,000

(9

R

+ 10,000

´

20,000

(17

R

+ 20,000

´

5000

(9

R

+ 5000

´

10,000

(13

R

+ 10,000

´

1000

R

+ 1000

S

16

INA210, INA211, INA212, INA213, INA214, INA215

SBOS437I – MAY 2008 – REVISED SEPTEMBER 2016

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Product Folder Links: INA210 INA211 INA212 INA213 INA214 INA215

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Copyright © 2008–2016, Texas Instruments Incorporated

Device Functional Modes (continued)

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

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

Table 1. Input Resistance

PRODUCT

GAIN

INA210

200

5

INA211

500

2

INA212

1000

1

INA213

50

20

INA214

100

10

INA215

75

13.3

Table 2. Device Gain Error Factor

PRODUCT

SIMPLIFIED GAIN ERROR FACTOR

INA210

INA211

INA212

INA213

INA214

INA215

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

based on Equation 2:

(2)

For example, using an INA212 and the corresponding gain error equation from Table 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 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.