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:

 

https://www.sparkfun.com/product...

 

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?

 

Thanks.

 

 

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