Has anybody had any luck with getting digital audio out of the iPad with an HDMI to Spdif adapter?
If used with the Apple Digital A/V Adapter (instead of the CCK), the iPad could theoretically be charged while outputting digital audio:
There's a thread about these converters, it never really went anywhere (HDCP issues?):
It seems that there are cheap Chinese "take your chances" units for ~$50, and "reputable" units for ~$200 (sample pictured above). And no guarantee that they will work with an iPad in this fashion.
In the above-mentioned thread it says that when the HDMI is outputted from some tablets the tablet screen goes blank, but this does not seem to be the case with the iPad.
The Apple Store reviews seem somewhat inconclusive, but their Digital A/V Adapter seems designed to mirror.
Ok, I have a Kudo solar charging case with back up battery for my ipad. It has hdmi out! Bingo!,,,, it lasts for weeks, and also has USB charging for iPhone.