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INA199A1 Datasheet(PDF) 11 Page - Texas Instruments |
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INA199A1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page Gain Error (%) = 100 (100 Gain Error Factor) - ´ 1000 R + 1000 S 1000 R + 1000 S 10,000 (9 R + 10,000 ´ S) 10,000 (9 R + 10,000 ´ S) 20,000 (17 R + 20,000 ´ S) 20,000 (17 R + 20,000 ´ S) Gain Error Factor = (1250 ´ INT R ) (1250 S ´ ´ ´ R ) + (1250 R ) + (R R ) INT S INT INA199A1, INA199B1 INA199A2, INA199B2 INA199A3, INA199B3 www.ti.com SBOS469D – MAY 2009 – REVISED NOVEMBER 2012 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 21). 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) INA199A1 50 20 INA199B1 50 20 INA199A2 100 10 INA199B2 100 10 INA199A3 200 5 INA199B3 200 5 Table 2. Device Gain Error Factor PRODUCT SIMPLIFIED GAIN ERROR FACTOR INA199A1 INA199B1 INA199A2 INA199B2 INA199A3 INA199B3 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 INA199A2 or INA199B2 and the corresponding gain error equation from Table 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 2, resulting in a gain error of approximately 0.89% solely because of the external 10 Ω series resistors. Using an INA199A1 or INA199B1 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 © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: INA199A1 INA199B1 INA199A2 INA199B2 INA199A3 INA199B3 |
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