we would like to use the ADC5940 respectively the ADUCM355 for voltage measurements (OCP, open circuit voltage) on an electrochemical sensor. Concerning this issue, two questions occurred. I guess ADC5940 and ADUCM355 are somehow similar.
1)We want to make a shortcut between the pins CE0 and RE0 and then measuring the voltage between CE0/RE0 and WE0 (OCP). Is it possible to measure that voltage by setting the MUXSELP-bits of the ADCCON-register to 01110 (page 70, ADuCM355 Hardware Reference Manual, https://www.analog.com/media/en/technical-documentation/user-guides/ADuCM355-Hardware-Reference-Manual-UG-1262.pdf respectivley page 61, AD5940 datasheet, https://www.analog.com/media/en/technical-documentation/data-sheets/AD5940-5941.pdf)
2) Which magnitude would be the referring input impedance?