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Jim Granville
05/15/12 17:49
Read: 609 times


 
#187375 - DDS (Direct Digital Synthesis)
Responding to: Jason Arkwright's previous message
Jason Arkwright said:

I need to generate a sinewave with quadrature outputs, speed wise >1kHz. Do you have an alternative to generating a digitally derived sinewave?


These days, it is usually done via DDS (Direct Digital Synthesis).
Analog Devices offer many variants, including one rather 'over-kill monster' AD9854 that has two DACs, and will do all you want in one package.

I think you can also use two DDS chips, and the single DAC ones come down to MSOP10 in size, so are easier to work with.
Some variants include more than just DDS, and can scan frequencies too (eg AD5932 )

Or, you could use a PC Sound card, if this is for a lab-test.

Or look for the smallest/cheapest Microcontroller (32b?) with Dual 12b DAC, and do in software, what these DDS parts do in hardware.

List of 24 messages in thread
TopicAuthorDate
256bit x 8 proms      Jason Arkwright      05/15/12 04:44      
   What frequency Sine wave & Clock ?      Jim Granville      05/15/12 05:37      
      Thank you      Jason Arkwright      05/15/12 08:10      
         DDS (Direct Digital Synthesis)      Jim Granville      05/15/12 17:49      
         digital sine wave      Andy Peters      05/16/12 21:24      
            uC sine generator      Jason Arkwright      05/17/12 04:36      
               DMA      Aubrey Kagan      05/17/12 06:43      
               neither do I      Erik Malund      05/17/12 07:07      
                  ARN      Michael Karas      05/17/12 15:30      
                  'F120 Series      Michael Karas      05/17/12 15:58      
               Other solutions      Jim Granville      05/17/12 20:12      
               150nS access time is so long      Justin Fontes      05/17/12 22:13      
            is that realy the case?      Richard Erlacher      05/23/12 16:21      
   Of course my solution      Jez Smith      05/19/12 09:11      
      Hmmm.., nice but...      Jason Arkwright      05/20/12 12:29      
         Those are actually PALs not CPLDs      Jez Smith      05/20/12 12:44      
         ATF750CL for PT clocks      Jim Granville      05/20/12 16:38      
            ATF750      Jason Arkwright      05/21/12 09:21      
               ATF750C ?      Jim Granville      05/22/12 23:42      
                  Yes, Jim You are exactly right.      Jason Arkwright      05/26/12 12:49      
                     Can I suggest      Jez Smith      05/26/12 14:00      
                     ATDH1150USB      Jim Granville      05/26/12 19:45      
                        Update : ATDH1150VPC      Jim Granville      05/27/12 05:57      
                        Thanks JIM      Jason Arkwright      05/31/12 15:57      

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