What is output overdrive of an opamp?

[treez]

Page 2 of the MCP601 opamp datasheet quotes conditions of "output overdrive" for the V(OL) value................what is "output overdrive "?

MCP601 DATASHEET
https://ww1.microchip.com/downloads/en/DeviceDoc/21314g.pdf

 

[HTA]

Overdrive mean that the input signal is the maximum and drives the output to the lowest output voltage. See figure 2-33 on page 11 of the DS.

Enjoy your design work in the new year!

 

[treez]

thanks,s orry i dont understand though.....the output of an opamp depends on the Vin and the gain........i dont see what "overdrive" has to do with it............an opamp can be "railed"................but surely being railed is being railed.........whatever "overdrive" is won't make a difference to the "being railed"?

 

[keith1200rs]

I believe it means that the opamp is driven with input voltages that attempt to put the output voltage 0.5V beyond the voltage rails.

Keith