protection schemes and analog input circuitry

[7rots51]

protection circuit

hello
I want to know what protection schemes can be inserted in front of analog input circuitry?
and the same for digital input circuitry?

Is there ICs for input circuit protrction?

Bye

 

[flatulent]

several

There are several devices sold for this purpose. One is a shunt zener type circut. Many companies sell these. Harris is one. They clamp the voltage levels. A cheap thing is to put diodes from the line to the positive and negative power rails.

If your circuit can operate with a little series resistance in the signal lines, putting these in will limit the current from an over-voltage and in many cases prevent damage.

CMOS logic circuits should have a shunt resistor to drain off static charge when the input is left floating.