What is the rest of the requirements needed driving you towards FPGA ?
This is a part with all these resources onchip, routable, and a fabric for custom logic. Note A/D
is good to 20 bits, and there is an onchip +/- .1% Vref, along with all the other stuff show below.
Multiples in many cases onchip....
IDE (PSOC Creator) and compiler free.
Boards ranging from $ 15 and up (more I/O basically).
ADC: resolution is the only thing that matters?
Farnell lists 14 bit ADCs with 50 samples/s up to 300,000,000 samples/s.
...with different interfaces, different conversion methods, different input voltage range, supply voltage range, precision, accuracy..
Any will be good?
FPGA: no preference about brand, IDE (language), I/O specification, complexity, RAM, speed, clock source..
Forum can help you if we know a overall design requirements/function.
Human interface considerations, electrical sensors needed/used, a bigger
picture of your goals.