I am using the LOG114 amp to monitor an exponentially varying pressure sensitive resistor and using the internal circuitry to generate a bias of -0.1V. When the resistance value is very small (approx. 50 ohms) i notice that the bias voltage drops, as if there is a resistor of about 35 ohms is series with the input. This resistor does not feature in the data sheets and I wonder if it is included in the IC package for input protection. Since it limits the range of resistances I can measure I wonder it there are versions of the LOG114 that do not include it or use a lower value?
Thanks, Paul