INA826 datasheet(21/33 Pages) TI

Il numero della parte	INA826

Spiegazioni elettronici	INA823 Precision, Low-Power, Wide-Supply (2.7-V to 36-V) Instrumentation Amplifier

PDF	33 Pages

Scroll/Zoom	100%

Produttore elettronici	TI [Texas Instruments]

Homepage	http://www.ti.com

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21 / 33 page

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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INA826 Scheda tecnica(PDF) 21 Page - Texas Instruments