I use the DH labs d750 which is terminated with rca on the transport end and bnc on the dac end. No adapter necessary. It is an excellent cable imho.
https://silversonic.com/products/digital-cables/d-750/?_vsrefdom=adwords&gclid=Cj0KCQiA0ZHwBRCRA...
https://silversonic.com/products/digital-cables/d-750/?_vsrefdom=adwords&gclid=Cj0KCQiA0ZHwBRCRA...