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AD9910 Eval software RAM loading errors

Thread Summary

The user experiences inconsistent loading of RAM data files into the AD9910 evaluation software, with occasional correct loads and a fatal error when enabling the multiplier with the OSK Digital Ramp Control window open. The support engineer suggests using a setup file and a 101-word RAM file in Raw Binary format to consistently load and read the RAM data, and advises checking the REFCLK input and PLL multiplier settings to ensure they are within the AD9910's specifications.
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In my application I want to have a certain profile perform a frequency sweep, so I want to use RAM control.  My problem is that loading my RAM Data File into the RAM using the eval software seems wildly inconsistent, meaning I load my file, then perform the Read RAM to file, and the two files are never identical.

I've "gotten lucky" a few times where the file was written into RAM correctly, but haven't been able to identify a process that makes this work all the time.  I've tried in both RAW Hex and RAW Decimal formats, and I've tried data files of various lengths, from 12 addresses to all 1024.

Has anyone else had this problem?  Is there any other way to load the RAM?

As a sidenote, during my poking around trying to fix this, I've discovered that clicking the 'Enable Multiplier' checkbox on in the Control window while the OSK Digital Ramp Control window is open causes a fatal error for the eval software.

Thanks for any help,

Thomas

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  • Hi

    I am using AD9910 evaluation kit. when I use PLL multiplication block and try to generate a single tone frequency. Initially there was no wave at the output but when I check the "PFD X reset" block then the output appears. But the output frequency is about 1.55 times greater then the desired frequency. for e.g 10 MHz comes out to be 15.5 MHz and 70 MHz comes out to be 108.5 MHz etc.

    Please tell me am I missing some thing or configuring board wrong?

    Thanks in advance...

    Regrads

    Salman Dinani

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  • Hi

    I am using AD9910 evaluation kit. when I use PLL multiplication block and try to generate a single tone frequency. Initially there was no wave at the output but when I check the "PFD X reset" block then the output appears. But the output frequency is about 1.55 times greater then the desired frequency. for e.g 10 MHz comes out to be 15.5 MHz and 70 MHz comes out to be 108.5 MHz etc.

    Please tell me am I missing some thing or configuring board wrong?

    Thanks in advance...

    Regrads

    Salman Dinani

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