[time-nuts] FE5680 DDS plot

[Javier Herrero]

I forgot... have you had the opportunity to check if the difference 
between the two DDS programming words is the same in all cases? All my 
readings leds to 1400.00x Hz, I've not looked at it but probably the 
difference in DDS counts is constant.

Regards,

Javier

El 02/02/2012 10:13, Javier Herrero escribió:
> Great plot :)
>
> I've a dump of the SPI transfers during a night taken with the logic 
> analyzer... but have found no time yet to process the dump to extract 
> the transfers. Of course it is easier to take it from the serial port 
> data :)
>
> The adjustment looks quite closely related to the temperature.
>
> Regards,
>
> Javier
>
> El 02/02/2012 06:15, Scott Newell escribió:
>> Javier Herrero's exciting DDS discovery led to this plot of the unit 
>> tweaking the frequency (cmd 0x22):
>>
>> http://n5tnl.com/time/fe-5680a/graphs/dds_autotuning.png
>>
>> It appears to make an adjustment even before lock!
>>
>
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-- 
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Javier Herrero
Chief Technology Officer                  EMAIL: jherrero at hvsistemas.com
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