I have a question on AD9257. Can we choose both 2X current and 100 termination through SPI 0x15 register?
The data sheet is not so clear on that. We would like to double termination on DCO and FCO lines....
Thanks for your interest in AD9257. Unfortunately the 2X FCO and DCO drive feature cannot be used with the internal termination selected.
FYI, when the internal termination is selected, the drive is automatically boosted to compensate for the additional load, but you cannot get an additional drive boost by selecting the 2X drive feature.
Writing Register 0x15 = 0x21 (attempting to have 100Ohm internal termination and 2X drive) results in Register 0x15 = 0x20 (100Ohm internal termination, 1X drive, but automatically boosted to compensate for the added load).
Retrieving data ...