Is there any difference between Ameba RTL8722DM (AMB 21) and Ameba RTL8722CSM (AMB 22) Specification wise? Just curious to know!
If you refer to the datasheet, you will be able to see the capabilities of each model number.
The RTL8722CSM lacks the dual band WiFi capability of the RTL8722DM
Thanks, and is the module is available to purchase now?
Regarding the RF shield, you might want to contact the seller to check if they provide it.
Since the intended purpose of the modules and EVBs is for end-product manufacturers to do their own in-house development and testing, Realtek provides support for certification testing, including providing the RTL8722 images necessary for the FCC test.