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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Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L. PHONE: +34 949 336 806
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19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com
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