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INA826 Fiches technique(PDF) 23 Page - Texas Instruments

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No de pièce INA826
Description  INA823 Precision, Low-Power, Wide-Supply (2.7-V to 36-V) Instrumentation Amplifier
PDF  33 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

INA826 Fiches technique(HTML) 23 Page - Texas Instruments

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Equation 9 calculates the common-mode rejection ratio with given factors:
CMRRdB =  G1 +1
α∙ΔRR∙ n
(9)
CMRRdB =  0.25 +1
0.33∙0.1%∙√4 = 65.5 dB
(10)
The scaling ratio G1 is calculated by:
G1 =  Rf Rf+ Ri
(11)
Where Rf is variable and Ri is fixed at 750 kΩ.
Figure 9-6 shows a comparison between the CMRR performance at worst-case (α neglected) and considering
normal distribution for different gain settings of G1.
For more details about the calculation of CMRR, see the Difference amplifier (subtractor) circuit analog
engineer's circuit.
9.2.2.3 Application Curves
Figure 9-6. Common-mode Rejection Ratio of External Resistor Network for Different Scaling Ratios
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INA823
SBOSA75A – JULY 2021 – REVISED JULY 2021
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