REF3030: Upper and lower limits of variation considering temperature drift

Hello,

Here is how I would calculate the minimum and maximum error for -10°C to 65°C when taking only initial accuracy and temperature drift into consideration:

Temperature drift max error = 75°C * 60 ppm/°C = 4500 ppm

Initial Accuracy Max Error = (3.006 V -3 V)/3 V = 0.2% = 2000 ppm

Total max error from initial accuracy = 6500 ppm

Total voltage error = 3 V ± (3 V * 6500 ppm) = 3 V ± (3 V * 0.65 %) = 2.9805 V to 3.0195 V

In the future, there is a calculator tool that can be very helpful for this:

https://dev.ti.com/gallery/view/LPVRS/ADC-TO-VREF-SELECT_Design_Tool/ver/1.0.0/ 

Here is how I used it with the values you shared:

Please ensure that as you use the calculator that you are inputting the correct values from the datasheet, and are setting the parameters you are not interested in to 0, as is shown in the example above.

Using the same method by using the calculator for -30°C to 85°C, the voltage range becomes:

3 ± (3 V * 0.89 %) = 2.9733 V to 3.0267 V

If you would like a voltage reference with better temperature drift performance, you can consider options such as REF3130AIDBZR (REF3130), REF35300QDBVR (REF35), or REF4132B30DBVR (REF4132).

Thanks,

Jackson