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INA826 데이터시트(PDF) 21 Page - Texas Instruments

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부품명 INA826
상세설명  INA823 Precision, Low-Power, Wide-Supply (2.7-V to 36-V) Instrumentation Amplifier
PDF  33 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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INA826 데이터시트(HTML) 21 Page - Texas Instruments

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Additional series resistors in the Wheatstone bridge string (R9 and R8) are required. These resistors adjust the
common-mode voltage, and thus can accommodate for the required output voltage of VOUT = 4.5 V.
To achieve the output voltage of VOUT = 4.5 V with the INA823, the limitation for the common-mode voltage is at
VCM(INA823max) = 1.8 V, as shown in Figure 9-3.
Figure 9-3. Screen Shot From Analog Engineer's Calculator
Select R8 in the same range of the bridge resistance. In this case, R8 is chosen to be 5.05 kΩ.
Resistor R9 is then calculated as follows:
R9 = VCMINA823max ∙(R2−R8−R)
VCMINA823max −2∙VEX  = 1.8 V∙ 4.99 kΩ2−5.05 kΩ −4.99 kΩ
1.8 V −2∙5 V  = 1.65 kΩ
(8)
Use a standard 0.1% resistor value of 1.65 kΩ.
9.2.1.3 Application Curves
The following typical characteristic curve is for the circuit in Figure 9-2.
Figure 9-4. Input Differential Voltage, Output Voltage vs Bridge Resistance
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INA823
SBOSA75A – JULY 2021 – REVISED JULY 2021
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