How Protect ADC Input

[terka]

protecting adc input

Hi

I want to make a circuit using TCL1541 ADC Converter, and i dont know how protect it of high voltage or short circuit, anything.

Thank for your cooperation


Bye

 

[IanP]

how can i protect the inputs of an adc

Depending on input impedance, a series resistor with 2 diodes (one connected to Vcc to protect input to Vcc+0.7V, second connected to 0V to protect input to 0V-0.7V) will provide suficient protection for ADC input.

Also, read this:
**broken link removed**

 

[terka]

protecting adc inputs

Hi

what about usign operational amplifier, how do it??

Bye

 

[IanP]

adc input protect

If you use an opamp as a buffer then you will need to protect its input in the same way as described in the previous post.
There are no reasons to employ opamps unless you would like to change input signal's range, increase input impedance etc..

Here you will find a lot of info on theory, selection amd configuration of opamps..
(buffers, invering and non-inverting)..
**broken link removed**

 

[mipedja]

protecting an adc input circuit

R- limits the current
Zener diode prottect against voltages greater than Vz. Vz is slightly greater than Vdd.
Schotky diode protect against negative voltages <-0.2V