As I'm new to this switched capacitor device, I have a question on the APPLICATION BULLETIN SBOA034 (Comparison of Noise Performance of FET Transimpedence Amp/Switched Integrator from Bonnie Baker).
For the bandwidth optimised configiration on page 7 and TABLE II, C2 is set to 1,5pF. The ACF2101 internal capacitor is already CINT=100pF. Is for this case the internal capacitor not used and only a 1,5 pF external capacitor connected between OUTx and INx?
I somehow expect that external capacitors are used for larger capacitance, not smaller.
In addition, page 6 states "The fastest feasible sampling frequency for the ACF2101 is 42.55kHz. This assumes that the internal capacitor (100pF) is used." which I interpret that the 100pF should be used for the fastest sample frequencies (so with optimum bandwidth performance I suppose)