[dragontamer]

> AVR EA just came out, but I don't understand them yet.

Okay, I spent a bit of time going over "AVR EA"'s datasheet. Here's my conclusion:

AVR EA's ADC converter is absurdly better. 12-bits and 375kSample/sec with upto 16x programmable gain amplifier (x1, x2, x4, x8, and x16 settings).

So with 12-bit / 375kSps / x16 PGA and a 1.024V internal voltage reference, the AVR EA can accurately measure 15.6 uV (microvolts) resolution. On paper at least. And mind you, this is a _differential_ ADC (all DA, DB, DD, and EA are all differential ADCs). Also, 500uVrms noise at x16 so oversampling required to make any of these lower-end bits usable.