EMRFD Message Archive 920
Message Date From Subject 920 2007-08-04 09:07:40 Giancarlo I0CG new AD9912 1GHz DDS Hi all,
You may recall my note regarding the expected good results on low
spurs using the Analog Devices AD9912 1GHz DDS.
Well, my good friend Giuliano, I0CG, (of AD9951 DDS fame) has now
experimented enough with this new DDS chip and done some measurements
with interesting results.
His comments are:
"My laboratory tests demonstrate that spurious performance and
frequency extension are superior to all others actual DDS, including
In a few words This new AD9912 DDS is the best solution available
today for amateur radio applications"
You may visit his web site and see spectrum analyzer screen shots and
comparison with his old AD9951 DDS design:
1) AD9912 with 190 MHz output ( Clock 1 GHz )Analyzer span= 200 MHz
2) old AD9951 with158 MHz output ( clock 500 MHz )Analyzer span= 200
3) AD9912 Frequency extension test: 400 MHz output ( clock 1 GHz )
Analyzer span= 500 MHz
http://it.geocities .com/giulianoi0c g/dds4.html
If you have problems to from the web page to be readdressed to his
AD9951 DDS project you may try the following address:
Giuliano is designing a new DDS PCB compatible with his actual
AD9951 board as users of his DDS can easily upgrade to new
performances for spurs but also extending the DDS use to VHF and UHF
with better SFDR ( HF, VHF and UHF VFO = 0-400 MHz with 1GHz clock
or 0-480 MHz with 1.2 GHz clock ).
Old and new projects can be easily updated to frequency and
performances extension with better SFDR.
I0CG expect to have the new AD9912 PCB available during this coming
Thanks Giuliano for all your dedicated work on this important aspect
of our radio technology.
921 2007-08-04 12:54:11 Sam Morgan Re: I0CG new AD9912 1GHz DDS Giancarlo wrote:
>I guess the 9851's I have on hand that I never used, should be headed to the
> Hi all,
> You may recall my note regarding the expected good results on low
> spurs using the Analog Devices AD9912 1GHz DDS.
> Well, my good friend Giuliano, I0CG, (of AD9951 DDS fame) has now
> experimented enough with this new DDS chip and done some measurements
> with interesting results.
GB & 73's
922 2007-08-04 12:55:46 Giancarlo Re: I0CG new AD9912 1GHz DDS Hi all,
I had a couple of spaces in between web address. Sorry>
Site is now experiencing problems as The web site has exceeded its
allocated data transfer.
930 2007-08-05 09:33:40 Giancarlo Re: I0CG new AD9912 1GHz DDS