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DAC38RF82EVM: Basic functionality; 1. enable/disable DAC output without powering down, 2. save DAC

Cal Harrington
Prodigy 10 points
Part Number: DAC38RF82EVM


Thanks in advance for your help.

I am using a DAC38RF82EVM to generate two channel waveforms and I'm controlling it with a TSW14J56EVM. If possible, I would like to be able to disable the DAC output without powering down the board. (I'm using this in an experimental setup and often need to verify my signals on a scope or spectrum analyzer.) I see from the user guide for the DAC board that jumper J2 can be positioned so as to enable or disable the DAC output (p3, table 2, row 2). Can this be changed while the board is running or is it for operating in some other mode and only to be changed when the board is off. Even better is it possible to disable and reenable the DAC output via SW?


Thanks again,

  • 0
    Prodigy 10 points

    After more exploring and I seem to have solved this question. If I leave the JP2 (I meant JP2 above, not J2, my apologies) floating I can set Tx enable from the DAC38RF8x EVM GUI on the DAC (A or B) channel control. Is this the appropriate way to do this? Neither the DAC38RFxx data sheet, nor the users guide for the eval board say anything I have found to indicate how this jumper "needs" to be configured. 

    Thank you again for your help.

  • +1 in reply to Cal Harrington
    TI__Guru* 79134 points

    Hi Cal,

    The ability for software based control or hardware GPIO based control is up to the user and end application requirement. GPIO based control are faster as there is a signal reaching the device to trigger the TXEnable. Software based requires additional SPI write time.

    -Kang

  • 0 in reply to Kang Hsia
    Prodigy 10 points

    Thank you Kang,

    Thanks for steering me in the right direction.

    Have a great weekend,

    Cal