Will this work by just adjusting the AD9279 to Mode III?
Unfortunately the AD9279-65EBZ will not run at 80MHz. The FPGA on the
HSC-ADC-EVALCZ will not run fast enough. That is why the AD9279-80KITZ
exists. It comes with the AD9279 board and a version of the HSC-ADC-EVALCZ
that will support the faster speeds.
Therefore you will need to order the KITZ if you want to evaluate at 80MHz.