large-signal differential voltage amplification : this is the open-loop voltage gain of the op-amp. although a minimum value of 20 V/mV, 20,000V/V is listed, the manufacturer also lists a typical value of 200 V/mV, or 200,000 V/V
input resistance : the input resistance of the op-amp when measured under open-loop conditions is typically 2MR, but could be as little as 0.3MR or 300Kr. in a closed-loop circuit, this input impedance can be much larger, as discussed previously
output resistance : the op-amp out resistance is listed as typically 75 r. no minimum or maximum value is given by the manufacturer for this op-amp. again, in a closed-loop circuit, the output impedance can be lower, depending on the circuit gain