[time-nuts] FE 5680A "new version" - Filtering the 10 MHz
EWKehren at aol.com
EWKehren at aol.com
Wed Nov 16 04:43:03 UTC 2011
The DDs is part of the Rb loop, the PLD divides by 3 and 2, the 10 MHz is a
direct function of the XTAL. I am sure the PLD also has other functions.
Older models had a 50.255 XTAL with a DDS on the output, I think the change
occurred some time between 2000 and 2002.
Bert Kehren
In a message dated 11/15/2011 8:02:57 P.M. Eastern Standard Time,
albertson.chris at gmail.com writes:
On Tue, Nov 15, 2011 at 4:25 PM, beale <beale at bealecorner.com> wrote:
> Sylvain Munaut wrote:
>> It's not generated from a DDS. It's from a xilinx PLD,
I think the DDS is implemented inside the PLD.
Sying "that is not a DDS, it's a PLD, is like saying "That is not an
amplifier, it is a transistor."
In the description of how the device works in the data sheet they say
there is a DDS inside the programmable synthesizer. It seems
reasonable that several functions are implemented inside the PLD and
this seems to be supported by the data sheet.
--
Chris Albertson
Redondo Beach, California
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