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Analog reading by ADC

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Hi,
Here is the problem I have. If I have a near square wave signal biasing at 0V with +-3V and this signal is feeding into ADC with reference voltage 0 to 3.3V.
What I interest is the only peak magnitude value of square wave (the negative part is actually not interested). Can I do so? Will this negative part signal will affect the circuit and reading?
 

Normal guidelines state that inputs should not be exposed to a voltage outside the supply rails. There are diode arrangements that can block a negative waveform from reaching your input.
 

Hi,

That would depend on whether the ADC is set up to accept negative-going signals. The "Auto-ranging DMM" pdf has an example of a precision rectifier - which sounds like the thing you want; the second pdf is a handy reference for all manner of set-up.
 

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  • Building an Auto-Ranging DMM an028 Intersil.pdf
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  • Buffer Op Amp to ADC Circuit Collection sloa098.pdf
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Hi,

If the ADC will survive, and if the ADC will operate correctly is written in the datasheet.

Klaus
 

No. Don't do it.

First perform a level-shift and then divide the input voltage.
This can be done by applying superposition techniques.
 

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