LTC5800-IPM Stack query

Hi,

I'm having couple of queries regarding "LTC5800-IPM" Wireless HART IC:-

1. Does it comes with an Inbuilt Stack? Does IC cost covers Stack too or does Stack costs extra? 

2. How to implement a stack / make use of Stack in LTC5800-IPM.

3. I didn't found RF Design guidelines, does Analog Devices provide RF Guidelines for LTC5800-IPM?

Thanks & regards

SUHAS S