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-ve input to ADC of AVRs & PICs

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sadat007

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Hi,
You can only put +ve signals to the input of AVRs and PICs Analog to digital convertors. :(

Any Idea to get -ve input. I have two ideas
1. Inverting the input (but how to stop +ve signal to get invert?)
2. Shift the input voltage i.e 0V gives 2.048V at adc (how to shift? and we will loose one bit also)

What is your idea, need help. :eek:
Thanks
 

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