3 Replies Latest reply on Mar 2, 2016 7:06 AM by helic_263931

    ripple on external DSM ADC reference depending on ADC clock

      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?