VHF Digital Divider

Jul 18, 2006 5 Replies

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RST Engineering (jw) 20 years ago

Please forgive my incipient senility; I know I posted this question a year or so ago and can't find the thread anywhere, either in my own archive or Google's archive.

Back when I was doing a fair amount of frequency synthesizer work I used the Motorola MC12015-16-17 for a lot of my prescaling tasks. Those devices are no longer in production. Right now I don't need dual modulus (pulse swallow) but could certainly use a dualie and just tie modulus control hard.

Does anybody still make a VHF/UHF prescaler these days? Through-hole preferred but SMT acceptable.

Jim

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Spehro Pefhany 20 years ago

NEC make a bunch, good for 1-3GHz, but IIRC they don't work below a fairly high minimum frequency (IIRC, ~1GHz for some of the 3GHz units). I doubt there's anything from them that isn't SMT, and fine pitch at that.

Best regards, Spehro Pefhany

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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Tim Wescott 20 years ago

That stuff went to ON semi, which still advertises some 1.1GHz prescalers. Dunno if they'd work at lower frequencies.

For VHF you could almost use a CPLD, but you'd have to do a lot of signal conditioning to get a clean clock in.

Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html

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John Larkin 20 years ago

NEC has a bunch. See CEL.com.

John

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Chris Quayle 20 years ago

Plessey Semiconductor used to make a wide range, including dual modulus. Now at:

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Chris

Greenfield Designs Ltd ----------------------------------------------------------- Embedded Systems & Electronics: Research Design Development Oxford. England. (44) 1865 750 681

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Joerg 20 years ago

Hello Chris,

And they made excellent mixers but unfortunately it seems they went under. When the last order bell was rung I quickly bought a stash of SL6440.

Regards, Joerg http://www.analogconsultants.com

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