Maximising resolution

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bit of noob question...

i want maximise resolution on analog input. understand acceptable range 0-5v, 10bit resolution, making 1,024 possible levels. means 1 level 4.882 mv.

for various reasons, easier me make sensor provide signal of say, 1v maximum. suppose can't full granularity on weak signal... correct?

or there way can arduino mega, input between 0 (minimum) , 1v (maximum), give me full 10bit resolution on range. mean 1 level 0.977 mv

not sure if i'm explaining well.

you can use internal voltage reference, 1.1v spreads 4096 levels on smaller voltage , have step 5 times smaller. how in reference documentation built ide.


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