Part Number: INA220
Hi Team,
The circuit design is shown below. The recommended PGA settings are /1 or /8. Which configuration provides higher accuracy?
Allen,
Thanks for the question and using the E2E forum.
If the numbers in your schematic are correct, I'm assuming the maximum current you're intending to measure would be 10A. If this is the case, your best PGA setting would be /1. Essentially, you want to pick the PGA setting that is closest to your maximum expected measurement. The caveat here is that if you do use the /1 setting, you wouldn't be able to measure 10.001A as that would be above the maximum full-scale input range (/1 can only measure +40mV while /8 can go up to +320mV).
An additional point to keep in mind is that the offset voltage increases as the PGA gain setting is changed. /1 has the lowest offset while /8 has the highest. This means that the /8 setting will show higher error at lower currents simply due to the additional offset error.
Please let us know if we can help with any other questions.
Louis
