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Nosie on DACs of ADuC7029

Question asked by Mack on Feb 26, 2014
Latest reply on Feb 28, 2014 by Mack

Hello,

 

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.

Capture.png

 

Best Regards,

Mack

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