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ADC128S102QML-SP: PSRR Error Calculation

Basil Sabu
Prodigy 10 points

Part Number: ADC128S102QML-SP

I have an ADC circuit that utilizes ADC128S102QML-SP. The ADC is powered by a 5V converter that has an output voltage error of +/- 0.075V. I would like to take the PSRR error into account for my ADC error calculation. However, the ADC datasheet does not mention PSRR error. Is there a way to calculate the error at the output of the ADC as a result of a change in power supply voltage?

  • 0
    TI__Mastermind 25070 points

    Hello Basil,

    This device uses the AVDD as the reference voltage. The voltage reference is used directly to make the digital measurements. Since this device uses the AVDD pin as the reference, any noise present in the voltage rail, will directly be reflected in the measurement. essentially making the PSRR zero. It is recommended to use a low noise LDO to drive the AVDD.

    Would you share your schematic, including your power supply and analog input circuit for review?

    Regards

    Cynthia