ADC pin protection

RE: ADC pin protection

Hieu — Wed, 08 Feb 2023 22:35:19 GMT

Hi Chibit,

Unfortunately, we do not release such details. I am very sorry for being unable to help.

Hieu

RE: ADC pin protection

ChiBit — Wed, 08 Feb 2023 03:51:20 GMT

Hi Hieu,

Thanks for the information. However, it would be of great help if you could provide pin diagrams that show the pin protection and any details on the ESD protection, because I can use other techniques such as current limit resistors to solve the problem.

Point of note is that I have excessive inductance in the circuit that is causing the voltage swings and knowing the details of the pins and ESD protection can save me time.

Your help would be greatly appreciated

ChiBit

RE: ADC pin protection

Hieu — Wed, 08 Feb 2023 00:34:20 GMT

Hi ChiBit,

There are some protections against ESD, but it is not recommended to rely on this for input outside of the absolute maximum ratings like you are describing.

Below is a quote from one of my seniors who is more experienced in this topic:

If a pin voltage goes outside of VDD/VSS rails there is a risk of forward biasing internal p-n junctions, injecting noise on rails and distorting signal. So rule of thumb is that it's not allowed. [...] (It's) hard to tell where the limit is. We recommend to avoid it.

Hieu