Hello,
I am wondering if anyone knows a possible solution to my problem. Analog Devices is obsoleting the AD9501 which is a digitally programmable delay generator and I still require that functionality. Are there any IC's which could do the same function? I am thinking of maybe doing something in an FPGA, or a clock deskew. Would anyone have some ideas? Its the fine resolution which is the problem.
Thanks, Rob
According to my notes, you can buy it from Rochester -
Analog gives you 10ps of resolution, not easy to match.
There are some ECL delay chips, from OnSemi and Micrel, but they are nowhere drop-in replacements.
You can do it yourself with a linear or sort-of-linear ramp, a comparator, and a dac. Takes a bit more room, of course.
There's also a heap of packaged delay-line companies.
John
f
They also give you rather more jitter, which you wouldn't want to match.
-- Bill Sloman, Nijmegen
ON-Semiconductor offers the MC100EP195 with a programmable delay of up to 10.2nsec and a resolution of 10psec. The delay range is a lot shorter than you could get out of the AD9501, so you might need to combine it with a 100MHz clock and a counter to get longer delays.
The delay you get out of the MC100EP195 is temperature dependent, which may be a nuisance, depending on your application. For closed loop clock de-skew, this might not be a problem.
-- Bill Sloman, Nijmegen
IS obsoleting it? It has been out of stock, non-orderable for some time now. Some of the vultures claim to have them, but I'd be suspicious of getting counterfeit or salvaged junk.
We used banks of them in a previous project, and are now redesigning to use FPGAs with fast SERDES components.
And, yes, they were quite ideal for our purposes, too bad they are gone.
Jon
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