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Is Simple H-Voltage Protection Circuit Response Time Sufficient to Protect A/D Channels ?

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irmak
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2019/07/12 10:32:28 (permalink)
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Is Simple H-Voltage Protection Circuit Response Time Sufficient to Protect A/D Channels ?

A simple solution for protection of PIC MCU A/D module with amplifiers with higher voltage supply then the PIC is zener diode and anti aliasing filters as simulated in the picture. 
 
I have two questions about the circuit;
1) How can we calculate the the R and C values of antialiasing filter for e.g 3k samples/per second ?
 
2) Is the reponse time of zener diodes sufficient to protect PIC 18F46K80 or PIC16F877a (circuit have almost 0.5 milisec)? Should we use protection circuits with op amps (OPA 698) to optain sufficient response time?
 
 

post edited by irmak - 2019/07/15 23:27:53

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