This particular transmitter, it has two types of connectors, the 3.5mm audio is also commonly referred to as an ANALOG connection, this connector will hookup directly to your TV's headphone out, which surprised, also has the exact type of jack. So all you need will be a 3.5mm to 3.5mm stereo cable.
If you TV doesn't have a headphone-out but a Toslink Out, the SPDIF connector as pictured above IS a Toslink connector. Again, if available, all you will need then is a Toslink-to-Toslink cable.
You are over-thinking this. All that explanation is simply to say, square peg to square hole.