Does Apple's iPhone 5 lightning to 31 pin adapter have an A/D converter in it?

Does Apple's iPhone 5 lightning to 31 pin adapter have an A/D converter in it?

I'm not sure what an A/D converted is. I have a 5, and an adapter, and when I put it on my iphone dock, it charges, and does everything it's supposed to.
I bough a Chinese knock off for 10$ on ebay. It didn't work properly, but they refunded my money with no problems though