1.

Go to www.ti.com/sc/docs/package/guide.htm and learn the definitions for terms such as pitch, preference code, type, and thick.

2.

Go to: www.ti.com/sc/docs/psheets/jedec/jedec.html and click on various JEDEC codes to find the description, pitch, number of pins, thickness and so on.

3.

Search the Internet for mixed signal ICs.