INA826 datasheet(23/33 Pages) TI

部件名	INA826

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

PDF	33 Pages

Scroll/Zoom	100%

制造商	TI [Texas Instruments]

网页	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 数据表(PDF) 23 Page - Texas Instruments