AD7124-4 long term gain drift

What is the long-term drift of the AD7124-4 gain after manufactoring calibration has been done?
Is it possible to recieve this data in ppm/1000 hours?

  • 0
    •  Analog Employees 
    on Jun 2, 2021 7:48 AM

    Hi Alexey, 

    I am not sure if we have this type of data. We do have a long term drift for internal reference and any drift or errors from the reference will translate possible gain errors. But just to add. The LTD for internal reference shows that the reference voltage is always within the datasheet initial spec of 0.2%.

    And to add, I think much important factor there is the Gain Drift errors due to changes in temperature. Performing calibration can be used effectively to remove any errors associated with temperature drift. 

    Does customer asking this because they don't want to perform frequent calibrations or is there any specific reason? 

    Can we take this offline and just contact Mary directly? 

    Thanks,

    Jellenie

  • Hi, Jellenie.

    AD7124-4 has gain error after internal gain calibration, espiсialy large with G>=16. And there isn't any error after system gain calibration. So we can do system gain calibration of devices on our factory, and at first time we will not have gain error, but there is a question - what will be with real gain after a month, a year, 5 year and so on? May be it isn't good decition to calibrate only one time and think that we kill gain error at all during all service life of the device.

  • 0
    •  Analog Employees 
    on Jun 5, 2021 1:47 AM in reply to DNB

    Hi Denis, 

    I understood the concern. But we'll take this offline. We will contact Alexey to answer all related queries for this project. 

    Thanks,

    Jellenie

  • Hi Jellenie.

    Alexey wrote me that you didn't give him any information. Can you answer me directly? 

    Thanks, Denis

  • 0
    •  Analog Employees 
    on Jun 15, 2021 1:59 PM in reply to DNB

    Hi Denis,

    Apologies for the delay. This query is already looking at by the product owner and hopefully will come back to you as soon as possible. As far as I know we do not have such specific data for this part. However, there could be some or other data in rel and qual testing that could be use to support this concern. 

    Thanks,

    Jellenie