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DAC43608: How to calculate the VOUTX(DAC output) when we define regarding VREFIN=VDD=+4V, DACn_DATA=255(DEC)?

H_K
Prodigy 230 points
Part Number: DAC43608

1, Could you share that how to calculate the VOUTX(DAC output) when we define regarding VREFIN=VDD=+4V, DACn_DATA=255(DEC)?

2, Would be it possible to output (Vout X)  of  3.984375 V? Customer calculates  it as below due to Rail-to-Rail device.

255/2^6×4=3.984375 V

From 8.3.1.1 : VoutX = (DACn_Data/2^(n)) * Vref IN

  • 0
    TI__Genius 14220 points

    Hi Kenma-san,

    Thank you for your query. As you have mentioned from datasheet section 8.3.1.1, the output of the DAC is given by the following equation:

    VOUT = (DACn_DATA/2^n)*VREF

    For DAC43608 with 4V VREF, the equation can be rewritten as

    VOUT = DACn_DATA *0.015625

    So, when the DAC code is full-scale, you get VOUT = 255*0.015625 = 3.984375V

    Note that, this is the ideal value. You need to consider the DAC errors and the reference error to understand what accuracy the output will have.

    Hope that answers your question.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DACs