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Q&A Driving ADC with opamp with large rails

In the image below is an opamp buffer with +/- 15v rails connected to a 3.3v ADC. The input to the opamp is limited to 0-3v. There is no protection circuitry for the ADC. Is the risk of the opam...

3 answers · posted 4y ago by z3333‭ · last activity 4y ago by coquelicot‭

Question ADC over-voltage opamp

#1: Initial revision by

z3333‭ · 2020-12-17T01:23:35Z (over 4 years ago)

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Driving ADC with opamp with large rails

In the image below is an opamp buffer with +/- 15v rails connected to a 3.3v ADC. The input to the opamp is limited to 0-3v. There is no protection circuitry for the ADC.

![Opamp buffer high rails to ADC](https://electrical.codidact.com/uploads/1SZrapasr24sss2CsTqLXacR)

Is the risk of the opamp overdriving the ADC too great for no input protection to be used?

ADC over-voltage

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