ADC value when input is less than 0V

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ADC value when input is less than 0V

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williamely
Contributor IV

In my design I have an ADC single ended input that may experience a voltage as low as -0.1V with respect to the analog Vss. I need to know what the conversion result will be in this case.

Is it 0?

Is it undefined?

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jeremyzhou
NXP TechSupport
NXP TechSupport

Hi William Ely,

It will read 0 when -0.1V connect the input pin if VSS is 0V, however I'd highly recommend that the range of the analog input voltage should within Vrefl~Vrefh.

Hope it helps.
Have a great day,
Ping

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jeremyzhou
NXP TechSupport
NXP TechSupport

Hi William Ely,

It will read 0 when -0.1V connect the input pin if VSS is 0V, however I'd highly recommend that the range of the analog input voltage should within Vrefl~Vrefh.

Hope it helps.
Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

View solution in original post