ADC to DAC problem

[binarybee]

Hi guys, I have a problem with ADC conversion I would say. I put sine wave on ADC input and then I just transfer the value to DAC register, but the negative half of the sine wave is clipped.

The code is just this ( Inside HAL_ADC_ConvCpltCallback):

DAC1->DHR12R1 =*(uint32_t*)ADC_DMA_ADDRESS;

Here is the screenshot of ADC settings:Here how is the output signal clipped.

 

Thank for any ideas and Happy New Year 🙂

[Vangelis Fortounas]

Hello

Happy new year!

The accepted input voltage to an ADC input pin is from GND (0) to VDDA. Negative voltages inject current tp ADCIN pin and may damage the device. In this case you may use an OPAMP for signal conditioning.