Sorry, I can't look at your code, I don't have NXG installed. I've got regular LV 2013 and 2016.
1. Limited frequency - what happens when you try 1 or 10 MHz? Do you get an error? What error # and what does the description text say?
My only guess in the meantime is that you may need to define a bigger buffer. In the code I posted, I took the original example's 8-sample buffer and replicated it 1000 times to make an 8000 sample buffer. That was big enough to support 1 MHz here (the limit for the board I have). The purpose of the bigger buffer is that the driver must continuously transfer data from the buffer down to the board to sustain the task. With a small buffer and high sample rate, the system can't keep up. A bigger buffer gives it some breathing room.
2. So now we're back to analog inputs? Try what I described in msg #6, using the linked example and the code I posted as guides.
-Kevin P
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