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I'm using the EP2S60 board now. I'd like to use the onboard DAC (DAC904) output as the external clock input. The DAC output is a square wave. However, the DAC output cannot drive the clock to work properly. Anyone has ideas about this issue? Thank you very much in advance!
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The DAC output is transformer coupled, with about 2Vpp unloaded output. It's not suited to drive a 3.3V CMOS I/O standard on input. It may work by AC-coupling the DAC output and using a 1.65 bias network at the clock input.
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