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ADS4142: RCR Filter

Jejomar Ildefonso
Genius 9690 points

Part Number: ADS4142

Hi Team,

Our customer has a slight clarification on the external RCR filter applied on the ADS4142EVM. I understand that this is to minimize input sampling glitches for low frequency operations. However, there is a slight discrepancy between the RCR filter resistor values of the ADS4142EVM (25Ω) and the typical driving circuit given on the ADS4142 datasheet (50Ω).

Can you give us insights on how the resistor filter values were set? Thank you very much.


Kind Regards,

Jejomar

  • 0
    TI__Guru* 91947 points

    Jejomar,

    The R-C-R network is acting as a low pass filter. Not sure why the two values are different. The value selected should be based on the max input analog frequency used. You will notice in the data sheet for the high frequency application mode that these parts are removed.

    Regards,

    Jim