I have an ADC whose analog input i would like to protect. I have found two papers from Texas Instruments which details on how to do so.
This is basically adding a series resistor to the ADC input and the input node,
Applying the methods above if my Analog pin limit is 3v and would like to protect until 30v
R = (30 - 3)/ 0.001
R = 27k Ohms
And just by adding a series resistor to the analog pin of the adc it is protected upto 30v. Very simple and very easy to implement.
Thats on paper though, I would like to know if this method is really effective in application. For the experienced please do tell me your experience if this alone can protect you adcs
This involves placing a surge protection diode on the ADC input lines shunt the extra current away from the adc.
Using something like TVS0500 as a added layer giving a larger over voltage protection. This how ever is not as easy to implement because its not only that you need 6 (do you even need that many?) of them per differential channel, but a slightly meticulous part selection.
Is it worth the extra way to implement this on actual implementation?