DAC38RF89: How to output Iout and Qout at the same time?

Part Number: DAC38RF89
Other Parts Discussed in Thread: DAC38J82

Hi,

In DAC38J82, it can output Iout and Qout at the same time in figure below. How can I do it when use DAC38RF89? It seems that dac38rf89 cannot output Iout and Qout at the same time.

  • User,

    Yes you can do this with the DAC38RF89. See section 8.3.16 (Wideband DUC mode) on page 50 of the data sheet. The input I data will be sent to DAC A and the input Q data will be sent to DAC B.

    Regards,

    Jim

  • Jim,

         I think that wideband DUC mode can output Iout or Qout only, not output Iout adn Qout at the same time.

  • User,

    My answer was slightly incorrect. In the wideband DUC mode, the data that would normally go to DAC B is sent to the output summer of CHA, and both outputs are summed to provide a complex output at CHA. See attached. The device can bypass the channel mixers and send the data directly to the DAC's. In this case you could send I and Q data at the same time to both DAC's. This is how the device works in real data mode with no interpolation or NCO. 

    Regards,

    Jim

    DAC38RF8x Wideband Mode.pptx   

  • Jim,

    I mean that In real data mode, I want to output Iin*cos(2π*fnco)-Qin*sin(2π*fnco) and Iin*sin(2π*fnco)+Qin*cos(2π*fnco) at the same time.

    How to do it?

    Regards,

    John