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In Reply to: Re: Need digital IC recommendations posted by zanash on November 27, 2006 at 23:46:18:
Zanash, I'd always thought that the twisted pair recipes were unsuitable for the 75 Ohm digital use, or at least that's what I'd read. Have you done these and tested them? Is this better than starter off the rack digital ICs?I have both sets of materials (except plugs) in house as it happens and can do a twisted pair very easily.
But I don't know how you "buffer" to 75 Ohms. Can you elaborate?
What about shielding? I'd always been told that the digital IC needs shielding most of the time.
Thanks.
Follow Ups:
do also go with BNC connectors. Even a cheap cable of copper, terminated into 75 ohms with BNCs will cream that 800 dollar cable terminated into RCAs. In the technology that I use, we terminate 250,000 DS0s through one copper cable and BNC with no errors. You read that right.
Even though a BNC connector might be 75 ohms at the cable end, the BNC female end inside of the DAC is probably just a wire jumping accross the air to the receiver chip. Even if it does go into a transformer first, it would hardly qualify as a true 75 ohm transmission line. In that light I think the effort spent keeping the cable end a true 75 ohms is sort of wasted.Maybe that's one reason why we all get different results.
Ozzie, that would require major surgery! Neither the DAC nor the CDP is set up for BNC, just RCA 75 Ohm and optical.I will try your suggestion of "any" IC and see what happens.
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