Below is a captured screen to show signal waveform from DAC of ADuC7029 on my target board.
A waveform of DC must be observed on DAC ouput pin becasue I congiured 0x08000000 to DACxDAT register.
The waveform like wawtooth as shown below seems to be observed when voltage out of range(beyond 0 to Vref) is enter into ADC input.
For example, in case -0.5V or 3V is input of ADC. I wonder if abnormal input for ADC could actually cause the ripple on DAC even though
I have ADCs and DACs operated independantly.