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DAC37J84: Output linearity

Part Number: DAC37J84

Hi,

Please tell me about the linearity characteristics of DAC3xJ84.

1. As the input level to the DAC decreases, the linear characteristic deteriorates at a level lower than -60dBFS.
   Is this performance within the assumption as a device?

2. If it is normal, why is it due to the INL and DNL characteristics of the device?

3. If the above "2." is correct, please refer to the data sheet DNL=±4LSB, INL=±6LSB,
   When expressing as the linearity error (dB) of the analog output, I would like to teach you how to convert it.

best

                                                                                                                                                                                                                            

  • Hi Cafain,

    We are looking into your questions, and will be back with you soon.

    Best Regards,

    Dan
  • Hi Cafain,

    Just to clarify, are you referring to the spur performance of the DAC as the power of the fundamental decreases? A -1dBFS signal uses most of the available codes (2^16), and has good linearity. When the signal is small, only a small amount of codes are used, and this causes linearity to degrade. Please see the below graphic from the datasheet. Notice that the smaller signal (-12dBFS) has worse performance.

    This performance degradation is not driven by INL and DNL error, but happens since only a portion of the available codes are being used.

    Best Regards,

    Dan

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