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What to do with unused channels of DAC084S085?

John Stevens
Expert 7395 points
Other Parts Discussed in Thread: DAC084S085

Team,

I'm using the DAC084S085.  It is a 4 channel DAC and we are only using 3 channels (A,B and C).

Channels A and C seem to work fine as long as Channel B is set to zero.  If Channel B is set to anything but zero, the other channels are attenuated significantly.  Is this a problem from leaving the unused channel (Channel D) disconnected?  Does channel D need to be tied to a load and driven?

Any help or suggestions would be appreciated.  I found nothing on the forum about this problem.

Regards,

John Stevens

  • 0
    TI__Guru 52346 points
    Hi John,

    The channels are independent. They should not affect each other under normal operation. Unused channels can be left unconnected.

    What is the B channel driving? Is teh B channel circuit different than the A and C? Is the CHB output value correct while the other channels are attenuated? Is the reference voltage and Va correct during this time?

    Regards,