INA821 datasheet(26/50 Pages) TI2

26 / 50 page

10 k

24.7 k

10 k

24.7 k

Over-

Voltage

Protection

Over-

Voltage

Protection

REF

+VS

V-

OUT

V+

-VS

-IN

+IN

RREF

INA821

SBOS893D – AUGUST 2018 – REVISED JUNE 2020

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8.4 Device Functional Modes

The INA821 has a single functional mode and is operational when the power supply voltage is greater than 4.5 V

(±2.25 V). The maximum power-supply voltage for the INA821 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. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

9.1.1 Reference Pin

The output voltage of the INA821 is developed with respect to the voltage on the reference pin (REF.) Often in

dual-supply operation, REF (pin 6) connects 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 INA821 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 65, any

resistance at the reference pin ( RREF in Figure 65) is in series with one of the internal 10-kΩ resistors.

Figure 65. Parasitic Resistance Shown at the Reference Pin

INA821 Datasheet(PDF) 26 Page - Texas Instruments

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