TX-2B block diagram explanation?

i have use the ic pair TX-2B AND RX-2B, for my remote control.
i have to explain each and every thing in this IC.
some body please help me in understanding the block diagram and the functions. if i want to built this IC my self than what things i need, and what is the schematic. so that i can explain it in good way.**broken link removed**

Please do not post multiple threads on the same question.
https://www.electro-tech-online.com/threads/tx-2b-rx-2b-b-diagram-explanation.117175/

Ken