In my current project I want to amplify audio signals for my speaker. The audio signal is driven by a DAC with a voltage range between 0V and 3.3V. To feed the signal to my amplifier, I need to use a capacitor in series to filter out DC while retaining AC. However, something tells me it's not a good idea connecting it directly to the output pin. Since the capacitor will also discharge, current flows in reverse direction back into the DAC's pin.
Is my reasoning correct? And if yes, how can I protect the pin?
The DAC belongs to the STM32H743ZI. You can find the datasheet right here.
Is my reasoning correct? And if yes, how can I protect the pin?
The DAC belongs to the STM32H743ZI. You can find the datasheet right here.