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Visitor kraig9
Visitor
723 Views
Registered: ‎09-05-2018

DDS alck input

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Hello,

 

If I say that I want a system clock of .01MHz and my board runs at 50MHz, does specifying system clock to be 1MHz take care of the clock input, or do I have to divide the clock to 1 MHz and then input it into the DDS?

Thanks,

Kraig Orcutt

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Scholar jmcclusk
Scholar
700 Views
Registered: ‎02-24-2014

Re: DDS alck input

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Why would you want a system clock of .01 MHz?    Normally, the DDS core is run at the board default system clock (50 MHz), and then you program the DDS to produce whatever output frequency you desire..     The output is a sinusoid waveform, not a digital clock.  

 

But if you really want to run the DDS at an effective clock rate of .01 MHz, the simplest thing to do is to connect to the 50 MHz system clock, and then use the tvalid signal on the core as a clock enable,  with a pulse rate of .01 MHz.   

Don't forget to close a thread when possible by accepting a post as a solution.
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Scholar jmcclusk
Scholar
701 Views
Registered: ‎02-24-2014

Re: DDS alck input

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Why would you want a system clock of .01 MHz?    Normally, the DDS core is run at the board default system clock (50 MHz), and then you program the DDS to produce whatever output frequency you desire..     The output is a sinusoid waveform, not a digital clock.  

 

But if you really want to run the DDS at an effective clock rate of .01 MHz, the simplest thing to do is to connect to the 50 MHz system clock, and then use the tvalid signal on the core as a clock enable,  with a pulse rate of .01 MHz.   

Don't forget to close a thread when possible by accepting a post as a solution.
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691 Views
Registered: ‎06-21-2017

Re: DDS alck input

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Just curious, but what frequency sine wave do you want to produce?

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Visitor kraig9
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630 Views
Registered: ‎09-05-2018

Re: DDS alck input

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I wanted to produce 600 Hz sine waves. I ended up using system parameters to generated the frequencies I needed. It's working as intended now. I appreciate the help.

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