Pretty much every I/O module has clock control that must be enabled before using that module. Those bits are in the SIM_SCGCx registers. The DAC also has to be initialized with things like your choice of Vref.
Why in the world would you serialize the data? I could see doing it if you were short on I/O but you aren't. Even at 75MSPS that fast processor is going to be hard pressed to read and do something with that data which...
Including the conversion time is a wasted effort. The ADC requires a clock input with very low jitter which means that you know (or should know) the timing precisely. Use that clock to trigger the DMAC which reads the...
That 8 Ohm load on your output can't be making that opamp happy.
If all you want to do is reduce the amplitude to drive a low level input then all you need are some resistors. But make sure that you don't have a...
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