How to use DAC channal output as ADC REF voltage intenally

[RShar.9]

Hello

i am working on stm32h7 and i want to use  DAC channal output as ADC REF voltage intenally.

can any please tell how to do it

[berendi]

The DAC needs the reference voltage to function, so it cannot generate it.

[RShar.9]

thanks for reply

if i connect dac channal output to adc ref+ what will happen is that any problem.

[RShar.9]

can we set that dac take vdd as reference and adc take vref+ as reference

[RShar.9]

in that situation dac output will also vary because dac reference also vary????

[berendi]

That makes no sense, because Vdd would make a very poor reference. There is a reason why the analog and digital signals are separated.

[oeliks]

Try to : Read vref - set dac low value - read dac output with the same adc but different channel - compare with vref - increase dac value untill it matches vref?

connect output of dac to input of adc

[Dvorak.Peter]

It can be done externally with an op-amp.

But I see no real benefit to this