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DAC122S085: Output noise that comes from internally

Michiaki Tanii
Expert 4640 points
Part Number: DAC122S085


Hi team,

 

Does DAC122S085 have output noise that comes from itself ?

According to the datasheet, it is needed to provide a noise VREF due not to have PSRR function.

 

Thank you and best regards,

Michiaki

  • 0
    TI__Guru 54523 points

    Hi Michiaki-san,

    The noise from the DAC itself is only due to the thermal noise of the resistor ladders and the output amplifier.  These are both pretty minor, so the VREF noise will dominate.  I do not have spec for the output amplifier noise, but the thermal noise can be calculated based on the ~60kΩ resistor ladder resistance.

    Thanks,

    Paul