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TLV5626: Performing Calibration to Zero Out Variability

KJ Hobday
Prodigy 735 points
Part Number: TLV5626


Tool/software:

Hello,

We are currently using a DAC as a reference for a DC/DC converter. There is significant variation that affect the operating point of our circuit. Is there documentation or a way to calibrate this DAC to zero out the variability?

Thanks in advance!

  • 0
    TI__Mastermind 42273 points

    Hi KJ, 

    We have this TIPL video that covers calibrating out the DAC offset and gain errors. The calibration involves doing a two-point measurement and updating the transfer function to calibrate out the errors. Precision DAC calibration | Video | TI.com

    To get closest to zeroing out the variability, you'd have to measure each DAC code and basically store the code and resulting output voltage in a look up table somewhere in memory. You'd refer to the LUT instead of using the transfer function. This is usually unrealistic to do, though may be doable for an 8-bit DAC as there are only 256 codes. Doing this would help you "calibrate" out the DNL error which is the irregularity in the step size from code to code which can't be corrected with the two-point measurement shown in the video.  

    Best,

    Katlynne