On 10/7/14, 10:32 AM, Magnus Danielson wrote:
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
The STEL-1173 takes 6 bytes, but writing the last one latches all 6
bytes over to a single 48 bit word. I expect that other DDSes have the
same distinct transfer-phase if you only look in the datasheet for the
details.
Yes, virtually all of them have a "load" input of some form (I'm
familiar with the AD98xx and AD99xx ones, and they certainly do).
What I'd really like, though is something at a slightly higher level of
integration (for which I am willing to pay.. it's a time vs money
thing). Does someone sell a DDS in a box with connectors, etc.
I need a tuning range, for now, of around 3.1 to 3.4 GHz, so any of the
"1 GHz" DDSes can generate something that I could mix up with a 2.8-3
GHz LO (which I have), although I'd have to be careful about images.
Or I can run the few hundred MHz out of the DDS into a doubler/tripler,
then mix up.
Some of the modern DDSes can take 10 MHz directly and step it up
internally before hitting the DDS core, but it may be that you need to
synthesize a higher clock from the 10 MHz first.
Not a problem, I think I have a 10 in to 100 MHz out set of bricks from
Wenzel (x5 and x2) from a previous project
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