INA230: DC Accuracy of INA230

Howard Chen

Part Number: INA230

Tool/software:

Hi Ti Team,

What expected DC accuracy of INA230 is? I mean the DC Voltage, Current and Power. I only saw the 0.3% gain error and 25uV offset in datasheet, but I don't know how to convert to the value we read directly.

Thanks.

5 months ago

0 Clemens Ladisch 5 months ago

Guru 317250 points

The offset error gets added to the input voltage; the gain error is a factor of the value read by the ADC.

So, voltage register value = (actual voltage ± V_os) × (1 ± G_ERR), or actual voltage = (voltage register value / (1 ± G_ERR)) ± V_os.

+1 Mitch M 5 months ago

TI__Mastermind 26345 points

Hello Howard,

In addition to what Clemens said, you may also be interested in our Error Tool, found here: https://www.ti.com/tool/download/CS-AMPLIFIER-ERROR-TOOL

This can give you an idea of the RSS Error you can expect based on your specific system parameters.

Regards,

Mitch

0 Howard Chen 5 months ago in reply to Clemens Ladisch

Prodigy 60 points

Thanks.

0 Howard Chen 5 months ago in reply to Mitch M

Prodigy 60 points

Appreciated. I'll use this tool to get the baseline of DC accuracy.

Amplifiers

Amplifiers forum

INA230: DC Accuracy of INA230