Yes, the coax or optical are always digital out, bypassing the dac, and can feed the digital inputs on a dac, amp, etc.
Just make sure the oppo digital outs are set to "pcm" through the onscreen menus to keep things simple.
If you need analog use the "front" rcas provided on the oppo. Make sure those outputs are set to stereo or mixed in the onscreen setup menu as well.
Pretty simple, actually.