Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

DAC output as the external clock input?

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 pr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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.