As far as I know, SACD digital stream can be sent to a consumer device (dac) only through a HDMI (secure) or proprietary (I2S) interface .
Some AV amps (my Denon, for instance) accept digital SACD input.
To come back to your initial post, SPDIF (coax/optical) interface is only for SPDIF digital stream. So, as Chris says, the optical output won't send any SACD data, it will send only PCM stream.
(you need SDIF3 to stream SACD through coax, only some professional drives have such an output/input).
Dimitri.
In a time of deceit telling the truth is a revolutionary act.
George Orwell