I've had some time away from this project but I'm back on it
I've set up a split rail supply for the op amp along with the 5v for the DDS and microcontroller.
There's an analogue ground from the DDS along with the digital one. I guess the former is the right one to use.
The question is though, as the DDS and microcontroller have their own common 0v / ground line and the op amp doesn't, how do I connect this side of things to the op amp ? And similarly, the op amp has an output but where's the equivalent 'ground reference' ?
I'd like to use the DS1054Z to show me the input and output traces to confirm operation. While the scope ground on the input channel will connect ok to the DDS / microcontroller 'digital ground', I don't want to blow something up but putting the scope ground on the output channel to the wrong potential and cause a short.
Please forgive any bad terminology.
Thanks