Hi Jeff,
Go to this site,
http://www.rentron.com/PicBasic1.htm
scroll to the bottom, and read Bruce's great tutorial on precision temperature measurement. He is using a different version of the sensor that you are using, but he discusses the differences, shows how to set up the A/D registers and how to set up vref. You can spend hours on Bruce's website, he shares a lot of knowledge, and I'm certain you'll find what you need there.
Jerry
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