It depends on how accuarte you want your 2V to be. A linear regulator (LM317) etc will give you an output voltage that can drive a decent amount of current, but the output will not be accurate to ppm.
If you want something stonkingly accurate, go for a voltage reference. Look at Maxim or TI for a 2.048V reference. This should be good enough for your applications. However, references cannot drive a great deal of output current, so you might have to put an op amp follower on the ouput if you want more welly out of it
If it has to be really accurate, use a good reference like the LM385-1.2V and a decent op-amp to gain that up to 2V. You can put a pot trimmer in the op amp if you want to set it to 2.000VHi
I need a 2v referance voltage source - it is for an old ADD3701 that I would like to use. any ideas for a simple yet accurate 2v component/circuit that will have a 5-6V input and 2V output? - I know that the IC is old, but I have it with the seven segments.