You could buffer the clock with a clock driver also. Of course, if you use a crystal that meets the ADI specs, the internally generated clock will meet specs. At 12:44 PM 4/22/2005, jcarlosmor wrote: >I am designing with the ADSP-21065L but the 3 ns rise and fall times >requirements for the CLKIN seem very hard to obtain from vendors. >Digi- >Key, Newark and some others only sell clock oscillators with longer >rise and fall time. I suppose that those requirements are not >necessary >if I use instead a cristal with capacitors and let the DSP to run its >internal oscillator rather than to use an external clock. Am I right? > >Thank you very much for your help. > > Steve Holle Link Communications, Inc. 1035 Cerise Rd. Billings, MT 59101 sholle@shol...

I am designing with the ADSP-21065L but the 3 ns rise and fall times requirements for the CLKIN seem very hard to obtain from vendors. Digi- Key, Newark and some others only sell clock oscillators with longer rise and fall time. I suppose that those requirements are not necessary if I use instead a cristal with capacitors and let the DSP to run its internal oscillator rather than to use an external clock. Am I right? Thank you very much for your help.