Hi Kaos,
The ADR02 could deliver up to 10mA.. and the most power hungry part is the isolator which basically depends on your maximum baud rate (remember that the baud rate is 2*CLK).
2- where us the LC tank?, If you refer to the 22uH inductor is basically to isolate noise between isocoupler and DAC... you can leave it...
Regards,
Miguel