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LM94022: Calculation for Cbp and Cfilter capacitor value

Nisha Yadav
Prodigy 75 points
Part Number: LM94022

Tool/software:

Hello 

I'm using LM94022 in my project. I have taken application design as a reference. According to the application note the value of Cfilter is depended on sampling freq. of the ADC, Please guide me how to calculate the capacitor value. For reference I attached the  part application design.

  • 0
    TI__Mastermind 42835 points

    Hi Nisha,

    The LM94022 is specified for up to 1100pF. Any capacitance beyond that would need to be isolated from the LM94022 by a series resistor. The ADC may have more specific details on the minimum capacitance that is needed for the ADC to work well. You would have to look to the ADC datasheet or app notes for that information.

    thanks,

    ren