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DAC3484EVM Digital Output

Kamal Mokhtar
Intellectual 420 points
Other Parts Discussed in Thread: DAC3484

Hello, I would like to know if I can use digital output 3bits from the DAC3484EVM. My setup is to use TSW1400 which is connected to the DAC3484 to control a laser. if yes what possibilities do I have to control those digital outputs, meaning is it possible to modify the setup profile to control those digital values from the GUI or the .csv file that is stored in the DDR memory.

Thank you,

Kamal  

  • 0
    TI__Genius 12965 points

    Kamal,

    You may input your own custom pattern to drive the DAC.  I would try using the included sine test pattern in the installation directory:

    C:\Program Files (x86)\Texas Instruments\High Speed Data Converter Pro\Test Files

    to get familiar with the file format.  You can open and edit this in excel or a text editor.

    The format of the file is 1 column per DAC.  For a 4 channel DAC you can use 2 columns (it will automatically copy the 2 channels to 4) or 4 columns if you want 4 unique channels.  The values in the CSV file need to be signed integers of 16 bits.  For example if the sine wave file has values ranging from -32768 to +32767 which correspond to -min to +max of the DAC codes.  You just need to create a file that uses these value ranges.

    Keep in mind the length (number of samples) of the file needs to be multiple of 32.  This is due to the memory structure of the ram implementation on the TSW1400.

    The default DAC3484 EVM uses a transformer on the outputs so be aware that if your signal has frequency content below 1MHz, it will be attenuated and may cause distortion on your time domain signal/pulses.

    Ken

  • 0 in reply to Ken C
    Intellectual 420 points
    Thanks Ken,

    Really useful information but my question is a bit different, maybe I haven't made it clear enough.
    My question is, can I used digital output value coming out from the DAC3484EVM. I know it is digital to analog conversion, but is there a way that I can use the unused pins to supply 3bit digital value from the DAC3484EVM controlling them from the TSW1400?

    Kamal