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INA212BIDCKT Datasheet(PDF) 11 Page - Texas Instruments |
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INA212BIDCKT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page Gain Error (%) = 100 (100 Gain Error Factor) - ´ 10,000 (9 R + 10,000 ´ S) 20,000 (17 R + 20,000 ´ S) 5000 (9 R + 5000 ´ S) 10,000 (13 R + 10,000 ´ S) 1000 R + 1000 S Gain Error Factor = (1250 ´ INT R ) (1250 S ´ ´ ´ R ) + (1250 R ) + (R R ) INT S INT INA210, INA211 INA212, INA213 INA214 www.ti.com SBOS437E – MAY 2008 – REVISED JUNE 2013 The amount of variance in the differential voltage present at the device input relative to the voltage developed at the shunt resistor is based both on the external series resistance value as well as the internal input resistors, R3 and R4 (or RINT as shown in Figure 24). The reduction of the shunt voltage reaching the device input pins appears as a gain error when comparing the output voltage relative to the voltage across the shunt resistor. A factor can be calculated to determine the amount of gain error that is introduced by the addition of external series resistance. The equation used to calculate the expected deviation from the shunt voltage to what is seen at the device input pins is given in Equation 1: where: RINT is the internal input resistor (R3 and R4), and RS is the external series resistance. (1) With the adjustment factor equation 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 RINT (kΩ) INA210 200 5 INA211 500 2 INA212 1000 1 INA213 50 20 INA214 100 10 Table 2. Device Gain Error Factor PRODUCT SIMPLIFIED GAIN ERROR FACTOR INA210 INA211 INA212 INA213 INA214 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. Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: INA210 INA211 INA212 INA213 INA214 |
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