iPod/ITouch direct digital connection to a DAC

Any suggestion for an iPod dock that will take direct digital to a DAC?  I have not found any that are currently available on the market.  I tried a Pro-Ject Dock Box S Digital but for some reason the unit kept rebooting my iPod every hour or so; I sent it back.  Pure i20 and Wadia 171i no longer available either.  I am now using the iPod dock for my iTouch6 but would really like to bypass the internal DAC in the iTouch and use my McIntosh D150 for converting.  Thank you in advance for all replies.