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TLC2274A-EP Datasheet(PDF) 27 Page - Texas Instruments

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Part No. TLC2274A-EP
Description  Advanced LinCMOS Rail-to-Rail Operational Amplifiers
Download  63 Pages
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC2274A-EP Datasheet(HTML) 27 Page - Texas Instruments

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BAT
g
R
4 (Tol)
V
R R
´
+
g
OUT
S
LOAD
R
V
R
I
R
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´
g
g
OUT
BAT
S
LOAD
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g
R
R
2R
V
(4 Tol)
V
1
2 Tol 1
R
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R R
R
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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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