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ADC12DJ1600-Q1: Background calibration ADC

Anca Carasel
Prodigy 70 points
Part Number: ADC12DJ1600-Q1

Hello,

My colleagues and I are looking for some trigger conditions for background calibration. We vaguely do understand how it can be done, mainly by setting different fixed temperatures.

I was wondering if you have any recommendations for the trigger conditions in this regard.

 

Thank you!

  • 0
    TI__Expert 6150 points

    Hello Anca,

    Just to clarify you are wishing to trigger calibrations when the based on changes in temperature correct?

    Best,

    Eric Kleckner

  • 0 in reply to Eric Kleckner
    Prodigy 70 points

    Hello,

    Yes. Do you have any recommendations?

    Thank you!

  • 0 in reply to Anca Carasel
    TI__Mastermind 23780 points

    Hi Anca,

    I'm a bit mis-understood after reading your initial post. What is the actual question? Are you wanting to know when you should use the calibration feature? This is supported such that a calibration can be done once the performance has dropped below a specific level which is set for your application, or when external factors such as temperature are drifting or changing rapidly. Another would be unstable power supply, higher/lower supply voltages, excess EMI, and other physical factors such as vibration or impacts. If a system is held stable across these factors, background calibration / continuous calibration may not be necessary at all and only a single one-time calibration at the initial powerup of the device would be all that is necessary. Find attached an article on calibration of ADC. https://www.ti.com/lit/an/sbaa590/sbaa590.pdf 

    If this is not what you are asking about, can you please rephrase your question for us?

    Regards, Chase

  • 0
    Prodigy 70 points

    Hello,

    We want to use this feature of this HS-ADC. However, we don't know what parameters to set as triggering conditions for activating this background calibration. 

    Can you help us?

    Thank you!

  • 0 in reply to Anca Carasel
    TI__Mastermind 23780 points

    Hi Anca,

    In background calibration mode, there is no triggering to begin calibration. The device is always being calibrated and cores are continually being swapped out with the calibrated core. To place the device into this mode CAL_BG must be set as 1 (0x61, 0x01), CAL_TRIG_EN must be set as 0 (0x6B, 0x0), and CAL_SOFT_TRIG must be set as 1 (0x6C, 0x01). I would also set CAL_BGOS to 1 (update 0x61 to 0x09) to enable the offset calibration feature as well, only if there is no near-DC signals. That is all that is needed for background calibration.

    Regards, Chase