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Why do we need an opamp in front of ADC

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azaz104

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Dear ALL,
My question is centered on ADC's of microprocessors connected to sensors via ADC's.
When do we need an OPAMP?
and Why do we need it, is it a buffer?

let's say I have a PIC or 8051 microcontroller ADC connected to a sensor that needs OPAMP, what opamps are suitable?

Best Regards,
Basel
 

azaz

I never had need to buffer in applications I worked.
What sensor are you refering ?

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target the question to a specific application where this is used.. as adre_teprom has told we cant visualise your problem properly, for any suggestion.

there is a possiblity that the sensor output is too low for ADC to detect, so an amplifier might be used before ADC.
 

For scaling the sensor voltage.
Say sensor output is very low or higher than V ref of ADC, in middle opamp does conditioning work.
 

To amplify or level shift the signal. Also, some ADCs, particularly fast ones, need to be driven by a low impedance.

Keith
 

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