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DAC8832: Output Impedance

aarmutat
Expert 3001 points
Part Number: DAC8832


What is the range of output impedance that can be expected for DAC8832?  Thanks!!

  • 0
    TI__Mastermind 46290 points
    Hi Andy,

    The DAC8832 is an unbuffered R-2R DAC which means the reference input pin will see a dynamic input impedance while the output impedance should be completely static barring some code-to-code transition periods. 6.25kOhms listed as the typical should be good within +/-20%, but this is not production tested otherwise you would see a minimum and maximum specification in the PDS. Generally speaking the device is expected to be buffered for most usages where the output impedance variantion would not contribute any linearity degradation as you may see with a MDAC w/ transimpedance output stage.

    May I ask why this information is needed so we can maybe help further?
  • 0 in reply to Kevin Duke
    TI__Mastermind 46290 points
    For others that may view this thread - the topic was mainly driven towards using the output impedance in conjunction with external components to form a filter. In the end, this may be acceptable however this depends on filter tolerances as defined by the +/-20% variance in output impedance of the DAC.

    Thanks.