I've been looking everywhere for this datasheet: AK4316 or AK4316-VS The chip is a 28 pin SOP package It appears chipdocs.com has it (there website looks to be down atm). But using google cache it looks like they have it, but its member access only.
I like a challenge, but it only took like 30 seconds. Not sure how you missed it, unless google is showing us different results.