8 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.

8.1 Application Information

The INA333-Q1 measures small differential voltages with high common-mode voltage developed between the

noninverting and inverting input. The high input impedance makes the INA333-Q1 a great choice for a wide

range of applications. The ability to set the reference pin to adjust the functionality of the output signal offers

additional flexibility that is practical for multiple configurations.

8.1.1 Input Common-Mode Range

The linear input voltage range of the input circuitry of the INA333-Q1 is from approximately 0.1 V below the

positive supply voltage to 0.1 V above the negative supply. As a differential input voltage causes the output

voltage to increase, however, the linear input range is limited by the output voltage swing of amplifiers A1 and

A2. Thus, the linear common-mode input range is related to the output voltage of the complete amplifier. This

behavior also depends on supply voltage; see Figure 6-20 to Figure 6-23 in Section 6.6.

Input overload conditions can produce an output voltage that appears normal. For example, if an input overload

condition drives both input amplifiers to the respective positive output swing limit, the difference voltage

measured by the output amplifier is near zero. The output of the INA333-Q1 is near 0 V even though both

inputs are overloaded.

INA333-Q1

SBOS464B – SEPTEMBER 2019 – REVISED JUNE 2023

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