EtherKit Si5351A (Rev C) Mystery Solved: Root cause for the board’s +3.3VDC rail short to ground was the presence of J10 installed on the CCA. This shorts out the supply due to the use of the ECS-250-8-30B crystal which has GND connections on non-crystal corners. With jumper cut, the board works! Now to figure out a best use for this multi-output programmable square-wave test oscillator. Maybe write a LabVIEW front-end controller to maximize versatility?
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Quick photo showing EtherKit Si5351 supplying 175 MHz on CLK1 output. Simple example program used for this test.
Quick photo showing EtherKit Si5351A board supplying 14 MHz output on CLK0 output.
Screen capture of Rev C schematic showing J10 (Osc Power) connecting X1 Pin 4 to +3.3VDC board power. J10 must be removed to use a ECS crystal on board and installed if a crystal oscillator is used instead. My board has a crystal and had J10 factory installed. This shorted out the +3.3VDC regulator. (Am sure it was not happy, but did not SMOKE.)
Screen capture of the ECS-250-8-30B package showing non-crystal package corners are connected to package ground.