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ADS1292: Regarding input filter ?

PYTsai
Genius 9855 points
Part Number: ADS1292

Tool/software:

Hi 

My customer added input filter as below , and found ADS1292 output signal will become very small. 

Can you help review is there any issue with the input filter below ? thanks!

  • +1
    TI__Guru 59726 points

    Hello PY,

    The corner frequency of the high pass filter is too high (approximately 20 Hz). Also, the passband of the filter is attenuating the signal by almost 6 dB. Please increase the resistor divider values to 10MΩ each.

    Original filter:

    Modified filter (R15 and R10 = 10MΩ):

    Regards,

    Ryan