The pin description of LOIN and LOIP on the ADRF6780 say that these are 100 Ohm differential inputs for the LO path but figure 83 on page 33 of the data sheet shows no termination resistors between the line, is this internal to the chip or isn't one required?
In addition, can this be temporarily fed from a single ended source if so does the other input need terminating in 50 Ohms?
Many thanks for any help you can offer.
This is internal to the chip. You can 50 ohm terminate the unused LO port and use it single ended.
The ds has a section called "LO INPUT DRIVEN DIFFERENTIAL vs. SINGLE ENDED" that details the performance differences.
That's great thanks