ATmega128rfa1 radio problems when AREF is connected

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I have been using the ATMEGARFA1 in several designs.  However, when I connect the analog reference pin (ARAF) to 3.3V, the radio stops receiving.  Transmit still works fine, but receive returns nothing.


I have had this problem in my own designs as well as on this breakout board:


as well as in my own design (which, in fairness, are based on that board).


Has anyone had this problem?  Or know what a solution might be?





Last Edited: Tue. Jan 4, 2022 - 11:43 PM