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ADC128S102QML-SP: operating at clock frequency outside of the specified range?

AnBer
Mastermind 28890 points
Part Number: ADC128S102QML-SP
Other Parts Discussed in Thread: ADC128S102,

Team,

I have seen the below E2E answer already:
https://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/599103/2202850?tisearch=e2e-sitesearch&keymatch=ADC128S102%20slower%20clock#2202850
I understand that we expect the device to be operated in the condition we describe in the data manual.
But may be we have some more information to share:
-When operating outside of the specified condition (at clock rate between 300khz and 800khz) what would be the typical consequence?
-What effect could appear when operating at such clock frequency?

Thanks in advance,

Anthony

  • 0
    TI__Genius 17035 points
    Hello Anthony,
    I want to point out that the commercial ADC128S102 and the space ADC128S102QML-SP use different die and some performance specs and operating ranges are different.

    This is a SAR ADC. The part will be operational with clock speeds less than 800 kHz, but the accuracy of the part will be impaired and it could vary greatly from unit to unit. At the lower clock speeds, the SAR caps might not hold the charge long enough for an accurate conversion.

    The part can run at lower sample rates than the stated 50 ksps by running the part in “burst” mode, but the minimum clock speed remains 800 kHz.
  • 0
    TI__Genius 17035 points
    Hello Anthony,
    The thread you indicate is for the commrecial ADC128S102 which is different from the space ADC128S102QML-SP. The space part is specified and tested over a wider operating range of a clock speed fo 800 krHz to 16 MHz.
    We do not have data for when the clock is operated under the specified frequency (between 300 to 800 kHz). I would expect lot to lot variations in the performance.