I'd like to use ADF7030-1 or ADF7021 with MSK modulation method but I can not find that
these chips accept MSK in thier datasheets. Both of them can use MSK modulation?
The ADF7021 could support both 2FSK and 4FSK. While the ADF7030-1 could support both 2FSK and 4FSK in transmit mode, but only 2FSK in receive mode.
You get MSK by setting the modulation index of FSK to 0.5, which can done on both radios.