This is the statement of AVcc in the datasheet of AT90CAN128:
"AVcc is the supply voltage pin for the A/D Converter on Port F. It should be externally connected to Vcc, even if the ADC is not used. If the ADC is used, it should be connected to Vcc through a low-pass filter."
On the evaluation board DVK90CAN1 for AT90CAN128 there is only a 100nF capacitor near AVcc. In my case, a DC/DC converter is used to supply power as Vcc. Can I replace the LP filter with just a capacitor just like this? If really using a LP filter, which one is better, RC or LC?