Tutorial on OPAMP and ADC

[HDaji.1]

Is there any good tutorial on using OPAMP and ADC together, esp. on G4 Nucleo board?

[Imen.D]

Hello @HDaji.1​ 

Have a look at this AN5306 Application note Operational Amplifier (OPAMP) usage in STM32G4 Series.

Refer also to this presentation of the STM32G4 OPAMP.

I hope these resources are helpful for you.

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Imen

[HDaji.1]

Hi @Imen DAHMEN​ ,

I have read those two documents, which well cover some tech details for OPAMP. However, there is no practical sample codes on how to use them.

In the software package for G4 MCU series, there is one sample of using HAL API to link DAC and OPAMP.

What I need is to connect OPAMP to internal ADC, can you give a step-to-step guide on how to do it in IOC UI?

[HDaji.1]

For example, I want to use OPAMP and ADC1 to monitor a voltage source value based on ADC_GainCompenstaion example.

In the IOC UI, I cannot connect OPAMP1 to ADC1 (PGA internally connected is disabled), so I select OPAMP3. According to G4 reference manual, OPAMP3_VOUT is internally connected to ADC1_IN12. There are two pins: PA1 for VINP and PB2 for VINM0.

My question is how to set non-inverting mode.

And I should link VINP pin to the voltage source, is it correct? How about VINM0 pin, just leave it because of non-inverting mode?