3 Replies Latest reply on Mar 2, 2016 7:06 AM by user_78878863

    ripple on external DSM ADC reference depending on ADC clock

    goggly.gogol

      Hello, I'm trying to use an external reference voltage (1.25V) in my design. The problem is that I've got a ripple (+-50mV) which depends on the conversion rate / ADC-clock. I've selectet 'Externel Vref on P0[3]', do I have to do more? It seems that this GPIO is not very high impedance or so..? If I switch the reference to internal, my external reference looks nice, so I excluded problems with my external design.

         

      Had anyone ever a similar problem?