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need some tech support for Purepath CC25xx IC

Other Parts Discussed in Thread: CC8521, CC8520, CC8531, CC8530, CC2500

I need some verification on the PurePath wireless radio. I have some questions of  the following parts:

1. what is the difference between CC8521 and CC8520?

2. What is th difference between CC8530 and CC8531?

3. Can I encrypt the payload data on the pure path wireless IC CC2500?

4. How many simultaneous channels the cc2500 Ti chip can support at 500kbps data rate?

5. Can customer decompress data at the receiving end?

thanks for your reply.