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Comments on Driving ADC with opamp with large rails

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Driving ADC with opamp with large rails

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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

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

ADC over-voltage opamp
posted over 3 years ago
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z3333‭
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General comments (4 comments)
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2kind‭ wrote over 3 years ago
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Only you could estimate the risk given the amount od data. Why connecting the opamp to +-15V when the rest of the circuitry could not grasp that?

z3333‭ wrote over 3 years ago
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I guess if they are the only other rails available in the system and one doesn't want to get a rail to rail opamp. Or maybe if I had a left over amp that I wanted to use.

Nick Alexeev‭ wrote over 3 years ago
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@z3333 Could you tell us the model of your ADC? If the ADC is built into the microcontroller, tell us the model of the microcontroller. This will allow us to reference absolute max values and other parameters for the ADC.

z3333‭ wrote over 3 years ago
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Sure, it is the ADC on the STM32F407VET6