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ADS7953: Rsource impedance

Part Number: ADS7953

Hi Team,

In datasheet, Rsource is recommended <50ohms. My customer found when they set Rsource=0 ohm,  the ADC captured data was not stable.

Why this impedance is necessary?

  • Hi Lilian,

    The resistance is necessary to ensure stability at the input, as opposed to the input signal being connected directly to the 'charge bucket' capacitor (shown in the diagram you shared).

    I recommend checking out the TI Precision Lab video titled "Introduction to SAR ADC Front-End Component Selection" for more information on why the charge bucket is needed.

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