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DAC8568: Calibration calculations

Danilo A.
Mastermind 26450 points
Part Number: DAC8568

Hi Team,

Our customer would like to know the calibration calculations of DAC8568 for the following parameters:
 
1)TUE
2)Gain error
3)Offset error
4)INL error 

Regards,

Danilo

  • 0
    TI__Mastermind 31638 points

    Hi Danilo,

    Can you explain what you mean by calibration calculations? 

    TUE is a combination of all of the DAC errors. INL is the deviation of the ideal transfer function from a straight line and is measured at each code. This can't be calibrated out.

     

    The ideal transfer function can be represented by y= mx+b. Offset error can be corrected by changing the b term so that the measured output is 0 when the DAC code is 0.

    Gain error is the error in the slope (m term) and this can be corrected adding a correction factor to the m term so that the measured output is equal to the full scale output when the DAC is set to full code.

    This would have to be measured and corrected on each DAC. 

    Screenshots from: Understanding Data Converters

    Best,

    Katlynne 

  • 0 in reply to Katlynne Jones
    Prodigy 10 points

    Hi Katlynne,

    Please are you getting my point my query is i need exart calibration parameters required for DAC 8568 where is this exarct equivalent for the LTC2600 

    and what are the main parameters to consider while replacing dac let me know please try to solve my issue 

    Awaiting for your valuable reply

    Regards

    Pavan

  • 0 in reply to pavan kumar
    TI__Mastermind 31638 points

    Hi Pavan,

    I do not understand your question. We do not have calibration parameters. The datasheet gives the typical, min, and mac specifications for all of the DAC errors, but these values will be different from device to device. The actual errors will need to be measured and corrected for on each device. 

    The DAC8568 and LTC2600 are very similar. The device pinout is different so the PCB would require a change to replace the LTC2600. Both devices will power up to zero-scale (the DAC8568 has a variant that powers up to mid-scale). It looks like the DAC8568 has better specs for offset error, gain error, zero code errors and full scale error. The DAC8568 also has lower power consumption. There should be no concerns with performance when switching from the LTC2600 to the DAC8568. If there is something specific that you are curious about then please let me know.

    Best,

    Katlynne Jones