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ADS1278-SP: Radiation data clarification

Massimo Maspero
Prodigy 10 points
Part Number: ADS1278-SP
Other Parts Discussed in Thread: ADS1278

Tool/software:

Please may provide me which is the unit for limits of GAIN and INL parameters reported in the Radiation Test Report "ADS1278-SP Total Ionizing Dose (TID) Radiation Report" (SBAK008A –October 2018–Revised August 2019).

It is not clear to me how to read (+/-4924 for gain and +11.9 for INL).

Please clarify,

Best regards.

Massimo

  • +1
    TI__Mastermind 46560 points

    Hello Massimo,

    The units used in the TID report are ppm (parts per million).  You can convert these to units used in the datasheet as % of FSR by diving by 10000.

    (PPM/100000)*100%. 

    +/-4924ppm is the same as +/-0.4924% of FSR for gain error.

    +11.9ppm is the same as 0.00119% FSR for INL.

    Regards,
    Keith Nicholas
    Precision ADC Applications 

  • 0
    Prodigy 10 points

    Hello Nicholas,

    just another question about another point relevant ADS1278-SP device.

    Do you have burn-in test useful to extrapolate ageing data, in particular about the following parameter (Gain Error, INL and Offset Error)?

    Thank you,

    Massimo

  • 0 in reply to Massimo Maspero
    TI__Mastermind 46560 points

    Hello Massimo,

    We do burn-in tests to simulate 10yrs of operation.  Take a look at this E2E FAQ for precision analog parts in general that can be applied to the ADS1278 family.

    https://e2e.ti.com/blogs_/archives/b/precisionhub/posts/ic-long-term-stability-the-only-constant-is-change

    The main points of this article:

    • Specifications centered around zero or a mean value (like Vos, Vos Drift, Vref, AOL, CMRR, PSRR, etc.) may shift over 10-year life up to:

                                 +/-100% of the max (min) PDS specified value

    • Specifications defined as an absolute value (like IQ, slew rate, Isc, etc.) may shift over 10-year life up to:

                                 +/-10% of the max (min) PDS specified value

    Regards,
    Keith