Digital Coax to XLR adapters?

Hi. I'm a newbie audiophile, so apologies if my question is naive.

Recently made some purchases on a "starter kit":
- Totem Acoustics Forest
- Music Hall 25.3 DAC
- NAD 375BEE integrated amp

The weak link in my system now comprises my sources: Sony CD carousel, Philips CR player/recorder, and Samsung DVD that can also play CDs.

My question: The digital outputs of the Philips CD and the Samsung DVD are both Coax. The DAC has only one digital coax in slot. But it has an unused XLR slot.

Is there such a thing as a Digital Coax-to-XLR converter? I have found XLR-to-RCA converters online, but I think those are for analog signals. Don't I need a special digital converter? Does one exist, and if so, can anyone recommend a good source?

Responses most appreciated!