INA821 datasheet(26/51 Pages) TI2

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8.4 Device Functional Modes

The INA819 has a single functional mode and operates when the power-supply voltage is greater than 4.5 V

(±2.25 V). The maximum power-supply voltage for the INA819 is 36 V (±18 V.)

9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

9.1.1 Reference Pin

The output voltage of the INA819 is developed with respect to the voltage on the reference pin (REF.) Often,

in dual-supply operation, REF (pin 6) is connected to the low-impedance system ground. In single-supply

operation, offsetting the output signal to a precise midsupply level is useful (for example, 2.5 V in a 5-V supply

environment). To accomplish this level shift, a voltage source must be connected to the REF pin to level-shift the

output so that the INA819 drives a single-supply analog-to-digital converter (ADC).

The voltage source applied to the reference pin must have a low output impedance. As shown in Figure 9-1, any

resistance at the reference pin (shown as RREF in Figure 9-1) is in series with an internal 40-kΩ resistor.

40 k

25 k

40 k

25 k

Overvoltage

Protection

Overvoltage

Protection

REF

+VS

V-

OUT

V+

-VS

-IN

+IN

RREF

Figure 9-1. Parasitic Resistance Shown at the Reference Pin

INA819

SBOS959D – DECEMBER 2018 – REVISED APRIL 2022

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INA821 Datasheet(PDF) 26 Page - Texas Instruments