using LME49990 with single supply
If you can provide only +5V you need to find another op-amp or revisit the power supply situation. 



It is not specified for less than 10V supply. 

Also, the inputs won't necessarily work if you're outside maybe +/-1V even with a +/-5V supply (input common mode range) and the output won't necessarily swing higher than +/-2.5V with a 2K load (output voltage swing). 

Op-amps that are specified with dual supplies will "work" with a single supply that exceeds the minimum total voltage and is less than the maximum total voltage (there is no 'ground' pin on most op-amps), but the inputs and outputs won't necessarily work as close to the supply rails as you might hope for. In other words, the op-amp might 'work' according to specs, but your circuit might not do what you hoped for.