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dac38j84 DAC gain block

Vladimir Anishchenko
Intellectual 260 points
Other Parts Discussed in Thread: DAC38J84

Hello,

  7.2 Functional Block Diagram in  dac38j84.pdf  shows a DAC Gain block. How the gain can be set? Is there any way to control gains for individual channels- DAC A/DACB..

Thank you,

Vlad.

  • 0
    TI__Intellectual 1440 points
    Hi, Vladimir:

    Yes, the DAC gain block is implemented by the QMC.
    1> First, QMC should be enabled. See config0.
    2> Then, individual gain control can be set through the QMC gain. See config16 for DACA/B, config17 for DACC/D.
    3> By default, the QMC gain is 1024(decimal) which means 0 dB gain. For example, you can change to 1446 to get 3dB gain for individual DAC.
    4> When dealing with digital gain control, one thing to take care is to back off signal and keep the digital signal to be saturated.
    5> Another way to get more gain is to enable inverse sinc function.
    6> For more output power, you can also refer to the IOUTFS setting.
    7> If you have installed the GUI, you can see it more clearly.
    Thanks a lot!

    Yarn.
  • 0 in reply to Yarn Guo
    Intellectual 260 points
    Hi Yarn,
    Thank you very much for the prompt response.
    Vlad.