I'm trying to make an input protection stage where the input to an ADC should be between 0V to 5V. And the following circuit seems working in simulation:
And here are the Vin and voltages as node a and node b(where node b will be coupled to an ADC which has range 0V to 5V):
And node a in detail looks like following:
As you see the clamping at node a starts from -0.7V and exceeds 5.6V. So the buffer takes care of this problem and produces a 0V to 5V for a -10V to +10V input.
But it also means that the node a input to the non-inverting input of the opamp has to be able to handle -0.7V and can go up to 5V. So if the opamp is choses as rail to rail it can go up to 5V since the Vcc is 5V.
But how about handling -0.7V input at node a? What parameter is this opamp datasheet shows the maximum negative input voltage with respect to ground. I couldn't find in ratings section.