SBAA507 March 2021 ADS8578S , ADS8584S , ADS8586S , ADS8588H , ADS8588S , ADS8598H , ADS8598S , ADS8661 , ADS8664 , ADS8665 , ADS8668 , ADS8671 , ADS8674 , ADS8675 , ADS8678 , ADS8681 , ADS8684 , ADS8684A , ADS8685 , ADS8688 , ADS8688A , ADS8688AT , ADS8689 , ADS8691 , ADS8694 , ADS8695 , ADS8698 , ADS8699 , OPA2990 , OPA4990 , OPA990
The bandwidth for this circuit is limited by the RC filter (R3||R4 and C1). The hand calculation and the simulated results compare well (hand calculation fC = 17.2kHz, simulated fC = 17.2kHz). See the Op Amp Bandwidth video series for more details on this subject. Note that the internal 2nd-order low pass filter of the ADS8681 has a 15-kHz bandwidth. The bandwidth for this circuit is mainly dominated by the low-pass filter of the ADC.