Well, I heard some people actually liked using regular RCA terminated IC's in the early years of DAC's/Transports, sort of a tone control. Plug it in and see if you like it. You won't damage anything. But you really do need a specifically designed digital IC (75 ohms) for the best performance with this type of connection.
Important Interconnect Question
How detrimental is it to not have a digital cable connecting a transport and a outboard dac? I was sold a analog interconnect by a dealer with whom I have a long standing affliation. I'm a bit embarassed to be even asking this but i assumed I was buying a digital cable. I'm not a 100% positive but very suspicious. I'm going to check when I get home.