I've been using the WS2801 chips for a while now but I'm struggling to get my lights fading smoothly with only 256 steps.
Does anyone know if there's a 16-bit version? Google didn't turn up any results but I don't have a part number to search on.

I have also considered dithering the normal 8-bit ones but I'm not sure if I can get the refresh rate high enough for that to work well.
I'd prefer an actual 16-bit chip if one exists.