1. Use multiple Op-Amps as differential amplifiers? 2. Do Op-Amps give full 0-3.3V output range?

[Sud_09]

Hello,
I had two related questions to clarify - 

1. Can multiple Op-Amps be used in the differential mode simultaneously and their output fed to ADC for measuring input DC voltage?

2. Also, since the Op-Amps inside the STM32G4 MCU are not rail-to-rail, they only output 0-3.3V for the given input. I am only interested in measuring DC input. Connecting the Op-Amp GND to system ground (0V) would give me the full range of output for DC (NOT 1.65-3.3V, but 0-3.3V), right? 

Thanks.

[Andrew Neil · Accepted solution]

I guess this is a follow-on from your previous thread ?

It'd be helpful to provide a link there so that people can find the follow-on questions.

Have you studied the Op-Amp section in the Reference Manual for the particular STM32G4 MCU you are using?

That will show you all the available options ...

You'll find the Reference Manual on the 'Documentation' tab of the Product Page for the particular STM32G4 MCU you are using; eg,

https://www.st.com/en/microcontrollers-microprocessors/stm32g484qe.html#documentation

[MasterT]

In short, there is no build-in configuration for diif-amp. But you can combine two opa over external wiring, and biasing non-inverting input, Check this thread