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Original question:

DAC81416: Extend's DAC's output voltage

DAC81416: Transfer function clarification

Van Chandler
Prodigy 30 points
Part Number: DAC81416


How is the transfer function affected by the Vcc /Vss rails? If I select unipolar 0-40V range and Vss=0 Vcc=32V, what is the output at mid scale, 16V or 20V?

Thank you

  • 0
    TI__Mastermind 19096 points

    Hi,

    For 0 to 40V range, we need min supply of VCC as 41.5V to have all codes for DAC. That being said, with VCC = 32V and VSS = 0V, for your mid code you will get 20V as output. As you approach full code, DAC outputs will not go beyond 30.5V. Basically you cannot have codes above 0xC333 ( dec 49971).

    Transfer function of the DAC is given by,

    For your case, Vmin = 0V and Vmax = 40V. Since your supply is 32V, max output voltage is 30.5V.

    Regards,

    AK