There's a fair number of such transmitters that accept optical or analog connections. I'd be dubious of most ADC's on a combo <$100 device *if* highest possible SINAD is your chief concern. Audibility is another story, as always.
@amirm thanks for testing this, I'm always curious about these little adapters because they can offer such easy fixes compared to wires. As an Android user, a few key points:
There's some kind of bug/feature that prevents you from locking LDAC sample rate. It always defaults to Best Effort once the connection is lost, and you have to reset it manually via developer options once connection is re-established. Even as an advanced user, this is tiresome yet I'm not aware of any fix. Maybe rooting? I'm not really in that space because, working from home, I need maximum reliability on my phone.
Many android devices, including my S10 5G, have dropouts/stuttering with the LDAC rate set to 990. It must be a fairly prevalent issue because the Qudelix app offers suggestions on how to work around it during configuration. In my case, I have to completely disable Location services but many people simply have to keep their screen off. Another deal breaker for a typical user.
Finally, latency on 990 LDAC can be as high as 250ms if not higher (device dependent). Obviously a non-issue for simple playback but videos can degrade into kung-fu mouth.