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ADuCM350 FAQ AFE Measurement Circuit Impedance Range

Q: Can ADuCM350 be used for measurement of capacitive load alone?


A: ADuCM350 cannot be used for measuring capacitive impedance alone as it would cause In-Amp loop in-stability. To maintain In-Amp stability ensure that the below two conditions are met in the circuit under measurement.


1.A minimum series resistance of 100 ohm.

2.The maximum frequency of the R and C combination is less than 500 K Hz.


i.e 1/(2*pi*R*C) =< 500 K Hz.


R – Series Resistance of the measurement circuit.

C – Capacitance of the measurement circuit.