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TLC2272MDG4 Datasheet(PDF) 27 Page - Texas Instruments |
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TLC2272MDG4 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 63 page  g BAT g R 4 (Tol) V R R ´ + g OUT S LOAD R V R I R = ´ ´ g g OUT BAT S LOAD g g R R 2R V (4 Tol) V 1 2 Tol 1 R I R R R R R æ ö æ ö ç ÷ = ± ´ + ± ç + ÷ ´ ´ ç ÷ ç ÷ + + è ø è ø DR Tol R = 27 TLC2272, TLC2272A, TLC2272M, TLC2272AM TLC2274, TLC2274A, TLC2274M, TLC2274AM www.ti.com SLOS190H – FEBRUARY 1997 – REVISED MARCH 2016 Product Folder Links: TLC2272 TLC2272A TLC2272M TLC2272AM TLC2274 TLC2274A TLC2274M TLC2274AM Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated However, as the resistors have tolerances, they cannot be perfectly matched. R1 = R ± ΔR1 R2 = R2 ± ΔR2 R = R ± ΔR Rg = Rg ± ΔRg (4) By developing the equations and neglecting the second order, the worst case is when the tolerances add up. This is shown by Equation 5. where • Tol = 0.01 for 1% • Tol = 0.001 for 0.1% (5) If the resistors are perfectly matched, then Tol = 0 and VOUT is calculated using Equation 6. (6) The highest error is from the Common mode, as shown in Equation 7. (7) Gain of 10, Rg / R = 10, and Tol = 1%: Common mode error = ((4 × 0.01) / 1.1) × 12 V = 0.436 V Gain of 10 and Tol = 0.1%: Common mode error = 43.6 mV The resistors were chosen from 2% batches. R1 and R 12 kΩ R2 and Rg 120 kΩ Ideal Gain = 120 / 12 = 10 The measured value of the resistors: R1 = 11.835 kΩ R = 11.85 k Ω R2 = 117.92 kΩ Rg = 118.07 kΩ |
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