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 the AD9951. 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 MHz 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: http://www.radioamatore.it/i0cg/add9951.html 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 September. Thanks Giuliano for all your dedicated work on this important aspect of our radio technology. 73 Gian I7SWX
921	2007-08-04 12:54:11	Sam Morgan	Re: I0CG new AD9912 1GHz DDS
Giancarlo wrote: > > > 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. > I guess the 9851's I have on hand that I never used, should be headed to the trash can? -- GB & 73's KA5OAI Sam Morgan
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> http://it.geocities.com/giulianoi0cg/dds4.html Site is now experiencing problems as The web site has exceeded its allocated data transfer. 73 Gian I7SWX
930	2007-08-05 09:33:40	Giancarlo	Re: 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
the AD9951.
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
MHz

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:

http://www.radioamatore.it/i0cg/add9951.html

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
September.

Thanks Giuliano for all your dedicated work on this important aspect
of our radio technology.

73
Gian
I7SWX