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DAC output as the external clock input?

Altera_Forum
Honored Contributor II
‎12-13-2010 04:03 PM
1,174 Views

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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Altera_Forum
Honored Contributor II
‎12-13-2010 05:16 PM
455 Views

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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