• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 46 subscribers
  • Views 570 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1248 The drift error of temperature sensor reading

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: ADS1248

Hi

My customer is using ADC1248 .
Could you let me know the the drif error(min and max value) of temperature sensor reading?
I know that typical value is 405 uV/C from datasheet.
I want to know the max and min value of the case that temperature range from 0C to 80C.

Thanks,
Shimizu

  • 0
    TI__Guru* 97955 points
    Shimizu-san,


    For the ADS1248, we do not give a min or max value for the temperature sensor. In the past, I've looked at some of the older bench characterization and final test data. The distribution of the measurement shows a single standard deviation of about 2C, if you used three standard deviations you would get about +/-6C of error.

    I talk about it a bit more in this post:
    http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/51686/182869#182869

    Note that there are no min/max specifications for it. If the customer wants to use it, they should characterize and calibrate it themselves. However there are other alternate methods of measuring temperature given in some of the notes below:

    http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=SBAA073

    http://www.ti.com/lit/an/sbaa134/sbaa134.pdf


    Joseph Wu
  • 0 in reply to Joseph Wu
    Guru 11235 points

    Hi Joseph-san,

     Thank you for your support.

     That has become a great help.

    Thanks,

    Shimizu

     

  • 0 in reply to masahiko shimizu
    Guru 11235 points
    Hi Joseph-san,

    Could you let me know a condition to the following information?
    Is that -40C~105C?

    >In the past, I've looked at some of the older bench characterization and final test data.
    >The distribution of the measurement shows a single standard deviation of about 2C,
    >if you used three standard deviations you would get about +/-6C of error.

    Thanks
    Shimizu
  • 0 in reply to masahiko shimizu
    TI__Guru* 97955 points

    Shimizu-san,


    Yes, that is correct. The ADS1248 is specified from -40C to 105C and there was a lot of characterization data taken on bench and at final for that temperature range (and for beyond that temperature range as well). I had looked at data that was taken with the rest of characterization.

    Again, I will note that this is not a guaranteed specification.


    Joseph Wu

  • 0 in reply to Joseph Wu
    Guru 11235 points
    Hi Joseph-san

    Thank you for your support.
    I also understood the following.

    >Again, I will note that this is not a guaranteed specification.

    Thanks
    Shimizu