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DAC 5662A in dual mode

Reenu Sam1
Prodigy 30 points

I am planning to use it in the dual bus mode,with the digital inputs for channels A and B shorted CLKA and CLKB also shorted(given a 100MHz clock ).

WRTA and WRTB are given a 50MHz clk but with a phase difference of 180Deg.In that case,I am assuming that the Output for each of the channels will get updated at a rate of 50MHz.

 

Will that work?

  • 0
    TI__Guru* 78424 points

    Reenu,

    I am assuming you intention is to create a delayed copy of the data on channel B. I believe this is doable. I will need to verify this operation and get back to you. Since the CLKA/CLKB line is running at 100MHz, the DAC will be updated twice before the data input is latched once. I want to make sure the DAC is properly updated on the 2nd time with the 1st data latched in. 

    -Kang

  • 0 in reply to Kang Hsia
    Prodigy 30 points

    Kang

    Thanks for the reply.My intention is generate two different signals at the outputs of channel A and channel B. With shared data input lines, shared clock but different write signals.

    Waiting for the result of the experiment that you intended to ddo

  • 0 in reply to Reenu Sam1
    TI__Guru* 78424 points

    Reenu,

    This method would work. Please be sure to follow the setup/hold time recommendations on page 17 of the datasheet.

    The test I have performed is the following:

    1. provide the same data to both bus A and bus B data. Short CLK1 and CLK2 to 100MHz clock source.

    2. provide 50MHz clock to WRT1 and inverted 50MHz clock to WRT2.

    3. observed channel A and channel B. Channel B is effectively a delayed version of channel A by 180 degrees. In your case, you will provide channel A data at an interval and channel B data at another  interval.

    -Kang

  • 0 in reply to Kang Hsia
    Prodigy 30 points

    Kang

    Just curious to know the kind of signal that was generated using the dacs.

    Can u plz tell me the type and frequency of the signal generated.

     

    Reenu

  • 0 in reply to Reenu Sam1
    TI__Guru* 78424 points

    Hi,

    I used a 5MHz single CW tone and also dual tone test at 4MHz and 6MHz each. The phase delay was observed on the eval board using oscilloscope.

    -Kang