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DAC / ADC output voltage function of STM32F303

Question asked by de_haas.volker on May 10, 2013
Latest reply on Oct 1, 2014 by Clive One
Hi,

There is a STM32F303 pin for VREF+ of DAC and ADC (in common). I would have suspected that this reference voltage input does adjust the conversion function in such a way that

Vout max of DAC (i. e. digital FFFhex) = Vref+
and
Output value of ADC at input of Vref+ = FFFhex.

But I can't find any formula in the reference manual for the ADC conversion function. The only formula I could find is one for the DAC at page 306 of the reference manual which does look suspicious:

DACoutput = VDDA* (DOR/4095)

This seems to me to be a special case where Vref+ input pin is connected to VDDA.
Has anyone experience with the ADC / DAC and could help me with that topic?

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