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VHF Digital Divider
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RST Engineering (jw)
electronics forum Guru


Joined: 24 Mar 2005
Posts: 313

PostPosted: Tue Jul 18, 2006 6:20 pm    Post subject: VHF Digital Divider Reply with quote

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
electronics forum Guru


Joined: 01 May 2005
Posts: 2326

PostPosted: Tue Jul 18, 2006 6:35 pm    Post subject: Re: VHF Digital Divider Reply with quote

On Tue, 18 Jul 2006 11:20:29 -0700, the renowned "RST Engineering
\(jw\)" <jim@rstengineering.com> wrote:

Quote:
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

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
electronics forum Guru


Joined: 04 May 2005
Posts: 707

PostPosted: Tue Jul 18, 2006 6:55 pm    Post subject: Re: VHF Digital Divider Reply with quote

RST Engineering (jw) wrote:

Quote:
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


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
electronics forum Guru


Joined: 29 Apr 2005
Posts: 4320

PostPosted: Tue Jul 18, 2006 8:11 pm    Post subject: Re: VHF Digital Divider Reply with quote

On Tue, 18 Jul 2006 11:20:29 -0700, "RST Engineering \(jw\)"
<jim@rstengineering.com> wrote:

Quote:
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


NEC has a bunch. See CEL.com.

John
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Chris Quayle
electronics forum beginner


Joined: 07 Jul 2006
Posts: 4

PostPosted: Tue Jul 18, 2006 8:57 pm    Post subject: Re: VHF Digital Divider Reply with quote

"RST Engineering (jw)" wrote:
Quote:

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

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

http://www.zarlink.com

Chris

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


Joined: 05 May 2005
Posts: 3533

PostPosted: Tue Jul 18, 2006 9:39 pm    Post subject: Re: VHF Digital Divider Reply with quote

Hello Chris,

Quote:

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

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


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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