The OPA191 datasheet shows the propagation delay for 100mV overdrive for rising edge and falling edge as 26us in figure 46 and 47 respectively. This seems to contradict the slew rate and settling time specifications of the part. The slew rate is specified as 7.5V/us (rising) and 5.5V/us (falling) for Gain=1, and 10V step. Settling time for a 5V step to 0.01% is specified as 1us with 20pf load and VS=+/-18V which agrees with the slew rate specification.
My question is, if I have OPA191 wired as a unity gain (non-inverting) amplifier with +/-18V supplies, and its input changes from -17V to +17V (input driven using series 4.7k), and my output load is greater than 22k ohms, in how much time can I expect the output to settle to within 0.01% of +17V?
Is there a separate propagation delay before the output starts changing? The propagation delay figure seems to show a 5 us delay before the output starts changing. But after this am I wrong in assuming that the output will slew at about 5.5 or 7.5 Volts per us and complete the 36V transition in 36/5.5 = 6.5 us?
Thanks for any support in advance..