looking for frequency synthesizer chip
 

Greetings..

I am looking for a frequency synthesizer chip that will have an output
anywhere from 5 mhz to 15 mhz.. or wider..

channel spacing of 1 hz...

Any thoughts?

Larry ve3fxq

Because of the availability of examples, the AD9850 is probably the simplest
to use. But some of the newer AD chips will give you cleaner output. They
get there with higher frequency oscillators, though, which translates into
more power. Most folks clock the 9850 at 100 or 120 MHz. Canned 100 MHz
oscillators tend to be pretty power hungry. The 9850 also gets hungry as
the clock goes up. At least some of the newer synth chips use less power,
but I don't know what you can do about 400 MHz clocks.

TI has some VHF/UHF chips that I know some folks have run as low as 50 MHz.
These use a crystal in the 20 MHz range instead of an external clock and are
pretty reasonably priced. If your objective is to go into a mixer, then you
could divide down a UHF synth to get to your 5-15 neighborhood.

...

"larry" wrote in message
...
Greetings..

I am looking for a frequency synthesizer chip that will have an output
anywhere from 5 mhz to 15 mhz.. or wider..

channel spacing of 1 hz...

Any thoughts?

Larry ve3fxq

Thanks..
Larry


"xpyttl" wrote in message
...
Because of the availability of examples, the AD9850 is probably the
simplest
to use. But some of the newer AD chips will give you cleaner output.
They
get there with higher frequency oscillators, though, which translates into
more power. Most folks clock the 9850 at 100 or 120 MHz. Canned 100 MHz
oscillators tend to be pretty power hungry. The 9850 also gets hungry as
the clock goes up. At least some of the newer synth chips use less power,
but I don't know what you can do about 400 MHz clocks.

TI has some VHF/UHF chips that I know some folks have run as low as 50
MHz.
These use a crystal in the 20 MHz range instead of an external clock and
are
pretty reasonably priced. If your objective is to go into a mixer, then
you
could divide down a UHF synth to get to your 5-15 neighborhood.

..

"larry" wrote in message
...
Greetings..

I am looking for a frequency synthesizer chip that will have an output
anywhere from 5 mhz to 15 mhz.. or wider..

channel spacing of 1 hz...

Any thoughts?

Larry ve3fxq