ADC reference voltage accuracy / tolerance

bjalgera
Posts: 2
Joined: Wed Jul 12, 2017 3:02 pm

ADC reference voltage accuracy / tolerance

Postby bjalgera » Fri Jul 14, 2017 8:01 pm

My understanding is that the ADC reference voltage is 1.1V and that different input ranges can be achieved via software settable "attenuation" settings.
My question is about the accuracy and tolerance of the reference itself. 5%? 1%? drift over temperature?

Thanks!

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loboris
Posts: 128
Joined: Wed Dec 21, 2016 7:40 pm

Re: ADC reference voltage accuracy / tolerance

Postby loboris » Sat Jul 15, 2017 7:58 am

It is nowhere documented (I couldn't find it), but the reference voltage source should be an bandgap reference with at least 50 ppm/°C to be usable...

WiFive
Posts: 888
Joined: Tue Dec 01, 2015 7:35 am

Re: ADC reference voltage accuracy / tolerance

Postby WiFive » Sat Jul 15, 2017 10:00 pm


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