>Use the AD reference at 4V or so. Where do you get inexpensive
>4V or so reference?
>TL431 or LM431

Anyone looking for low noise accurate references may like to look at the new 
Analog Devices range. Look at the ADR44x range, each voltage output comes in 
2 grades of tolerance, and includes 2.048 and 4.096V references. 

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