ATA5781/ATA5781N/ATA5782/ATA5783 UHF ASK/FSK Receiver USER MANUAL Introduction The Atmel® ATA5781/2/3 is a highly integrated, low-power UHF ASK/FSK RF receiver with an integrated AVR® microcontroller. It is package and pin-to-pin compatible with the previous generation of RF devices (Atmel ATA5830N, ATA5831/2/3 and Atmel ATA5780N).