The leckerton is not licensed by Apple to decode digital signals. For that you would need a clas, Centrance M8, hp-p1 or such.
Personally, I just run the headphone out on my 5g touch (lightning connector model) to the analog input of the Leckerton and it sounds great. Just max the volume on the iPod and knock it down 2 steps. It sounds cleaner than the lightning to 30 pin adapter anyway.