Question about ADC bandgap voltage value

[zyt]

Hello everyone.

Now I use ADC module of s32k146, and have get adc value of banggap. It's about 0.98v after converter.

In datesheet, the bandgap voltage value is described as below:

How can I know the precisely bandgap voltage value of my chip? And how to judge there is some error of adc module or the bandgap voltage value is really 0.98V?

Thank you.

[949147417]

Hello, what is the ADC count value?  about 819?  thanks

[davidtosenovjan · Accepted solution]

Hi, if you measure 0.98V, it is perfectly within specified range.

Bandgap voltage is fixed voltage reference, more or less independent on reference voltage (imagine Zener diode).

Regarding evaluation of ADC accuracy I would recommend to use different channel (calibrated laboratory voltage source), as here you cannot distinguish between band gap tolerance and ADC error contribution.