INA826 datasheet(23/33 Pages) TI

Part #	INA826

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

PDF	33 Pages

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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23 / 33 page

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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INA826 Datasheet(PDF) 23 Page - Texas Instruments