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DAC37J84: Signal upconversion

art arty
Prodigy 140 points
Part Number: DAC37J84
Other Parts Discussed in Thread: TRF370417

I have complex digital signal stored as I and Q samples. Its bandwidth is [-60; 60] MHz. My goal is to have [150; 270] MHz real analog output signal.
I decided to use to use DAC37J84. Is it possible, and how can I do it with this DAC?
Should I upconvert this signal in DAC chip by using internal complex mixer to have [150; 270] MHz output signal? Which interpolation and DAC sampling rate should I use in this case?
Or it would be better to convert I and Q "as is" by DAC without modulation and then upconvert analog I and Q signals to [150; 270] MHz bandwidth by something like TRF370417?

  • 0
    TI__Genius 9695 points
    Hi Art,

    You can use the DACs mixer to up-convert your baseband signal without an external modulator.
    The available modes and interpolations are given in table 11 of datasheet.
    Note:
    - DAC Sample rate = Interpolation * baseband data rate.
    -DAC sample rate should be at least 2x the highest signal frequency which is 330 MHz in your case

    Thanks,
    Eben.