SLYT840 june   2023 INA333 , INA350

 

  1.   1
  2. 1Introduction
  3. 2Dual-supply circuits
  4. 3PCB layout
  5. 4Measurement results
  6. 5Conclusion

5 Conclusion

While many designers typically implement a discrete solution in low-cost applications, new general-purpose IAs (TI’s INA350, for example) will likely yield lower overall cost and better performance. Depending on the gain, precision IAs such as the INA333 can offer superior performance and gain range, although the external RG is an important factor in performance, especially over temperature.

Table 3 summarizes the comparison.

Table 3 Comparison of dual-supply IA circuit solutions.
PCB Area Gain Range Performance Cost
Discrete IA 48.78 mm2 1 V/V to @100 V/V Good $$
General-purpose IA 16.79 mm2 10, 20, 30, 50 V/V Better $
Precision IA 29.7 mm2 1 V/V to 1,000 V/V Best $$$$

The next time you are designing a dual-supply IA, weigh the trade-offs outlined in this article. For applications that require the greatest accuracy, precision IAs are the obvious choice. For applications that require cost-effective performance, the choice is no longer as easy as building a discrete IA. New general-purpose IAs can provide significantly better performance than discrete solutions, while taking up less PCB area and lowering system costs at the same time.