what frequency steps are you looking for harry????
if its for the broadcast band then the philips range of tsa5511/12/14 are
cheap and have upper operating range of 1300mhz, only trouble with them is
50khz steps..pic codes available on the net...otherwise the mc 145170 is a
good choice, operates up to 170mhz..but is serial controlled as well....
g0zen simon
"Richard Hosking" wrote in message
. au...
I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are
widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL,
why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except
for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is
available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without
any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

what frequency steps are you looking for harry????
if its for the broadcast band then the philips range of tsa5511/12/14 are
cheap and have upper operating range of 1300mhz, only trouble with them is
50khz steps..pic codes available on the net...otherwise the mc 145170 is a
good choice, operates up to 170mhz..but is serial controlled as well....
g0zen simon
"Richard Hosking" wrote in message
. au...
I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are
widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL,
why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except
for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is
available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without
any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL, why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

Harry,
have a look at the following page:
http://www.xs4all.nl/~barendh/Indexeng.htm
He seem to stock several old Plessey prescalers, and it should keep
you going for a while.

I guess eventually these chips WILL be nowhere to be found within a
few years time but that is evolution....

One non-obsolete chip-source would be Peregrine,
http://www.peregrine-semi.com/prd_pll.html
they have some neat parallell programmed IC's that runs to over 3 GHz.
They are an improved Qualcomm Q3036 which can be found as surplus
And there is several more interesting IC, not only PLL and prescalers
but complete PLL with internal EPROM which keeps the serial programmed
data even if one shut off the power. Great for that miniaturized
project!!

GL
-Lasse SM5GLC
On Fri, 15 Aug 2003 08:26:47 +0200, "Harry \(SM0VPO\)"
wrote:

Harry,
have a look at the following page:
http://www.xs4all.nl/~barendh/Indexeng.htm
He seem to stock several old Plessey prescalers, and it should keep
you going for a while.

I guess eventually these chips WILL be nowhere to be found within a
few years time but that is evolution....

One non-obsolete chip-source would be Peregrine,
http://www.peregrine-semi.com/prd_pll.html
they have some neat parallell programmed IC's that runs to over 3 GHz.
They are an improved Qualcomm Q3036 which can be found as surplus
And there is several more interesting IC, not only PLL and prescalers
but complete PLL with internal EPROM which keeps the serial programmed
data even if one shut off the power. Great for that miniaturized
project!!

GL
-Lasse SM5GLC
On Fri, 15 Aug 2003 08:26:47 +0200, "Harry \(SM0VPO\)"
wrote:

http://www.peregrine-semi.com/prd_prescaler.html

:2 , :4 or :8 DC to 1GHz

Buy online, price seems to be less than $3

-Lasse SM5GLC

http://www.peregrine-semi.com/prd_prescaler.html

:2 , :4 or :8 DC to 1GHz

Buy online, price seems to be less than $3

-Lasse SM5GLC