Adaptive transmit power of RFX2400 daughter board

Hello, all!

I am looking into the file under the directory of
python/digital. The default value of the --tx-amplitude is 12000 and the
transmit power of RFX2400 is 50mW. Is there any relationship between
these two numbers? If I changed the --tx-amplitude to be 1200, what is
the transmit power in mW? How can I translate the --tx-amplitude to the
real transmit power in mW? Thanks a lot!!!