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ADS1248: PSSR vs frequence of ADS1248

Jimmy Zhou95
Intellectual 870 points
Part Number: ADS1248

Hi expert,

Do you have some data about PSSR vs frequence of ADS1248? My customer use DCDC to power ADS1248 with some code-jitter issue. Thansk!

Jimmy

  • 0
    TI__Mastermind 35111 points

    Hi Jimmy,

    The ADS1248 datasheet does specify PSR at DC in the electrical characteristics table as well as PSR as a function of gain in Figure 32. However, we do not have data on how the ADS1248 PSR changes with frequency. I also checked our backend characterization data and did not see anything relevant.

    You might want to consider adding a low-noise LDO to the output of the DCDC converter and see if this improves the issue. Performing this action will at least tell you if the issue is related to power supply noise, or something else.

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Intellectual 870 points

    Hi Bryan,

    Thanks for your info here^_^

    Jimmy