Most recorders that can take a coax spdif input can accept an AES signal, either with a straight adapter cable like Terry linked to, or more properly by using a 100>75 transfomer:
http://www.fullcompass.com/product/258528.html
oo, neato. I knew you could convert via the hosa box, but didnt know about the barrel method (does it resolve voltage level differences, or just impedance?)
It is designed for correcting the impedence differences, but it also affects voltage based on the turns ratio of the transformer. I'm going from memory, but I think it dropped a 5v signal down to a 0.5V signal. So yes, iirc it more-or-less corrects the voltage level differences as well.
I don't think it should be a problem using with the 680 since it is not converting the digital stream, it is just correcting impedence and voltage levels. I sold my Canare 110>75 transformer a couple years back though, so I can't test it with my 680.