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DDS39RFS10: B channel in single channel devices

Christer Andersson
Intellectual 290 points
Part Number: DDS39RFS10
Other Parts Discussed in Thread: DAC39RFS12, DAC39RFS10, DAC39RFS10EF, , DDS39RFS12

Tool/software:

Hi,

I'm focusing on DDS39RFS10 for now, but this question applies to other similar single channel DAC devices, e.g: DDS39RFS12, DAC39RFS12, DAC39RFS10, DAC39RFS10EF, etc.

  1. For single channel devices I assume there is no need for separate LDO:s etc for the B channels supplies, but should the B channel supply pins be left floating or connected to the A channel supplies? In the DDS39RFS10 datasheet the following A/B supply pairs are listed:
    1. VDDA18A / VDDA18B
    2. VDDEA / VDDEB
    3. VDDLA / VDDLB
    4. VEEAM18 / VEEBM18
  2. Should the DACOUTB output pins be left floating or tied to GND?
  3. Any other caveats when implementing a board with a single channel device?

Thanks!

  • 0
    TI__Mastermind 38970 points

     Hi Christer,

    Sorry for the confusion.

    The unused DACOUTB output can be left floating.

    The DACB supplies (VDDAB, VDDEB, VDDLB, VEEBM18) should be connected but can be shared with their A side counterparts. No need for separate regulators/filtering.

    Regards,

    Rob