Anything close to the rail is OK for me. I bought the LMC6482.
Im not really sure that makes sense to me @rlogiacco.
I have made a new circuit with the photodiode, where i treat the V- pin on the op amp as GND and the V+ pin on the op amp as 5V. Both from the board.At the moment i have ground connected to the positive terminal. My photodiode goes into my negative terminal - as well as the feed back resistor and capacitor which is also connected to my output.
What i think you're saying - and im probably wrong..Is to put 2 resistors of the same value somewhere off the side and put 5 volts on one side and GND at the other side. So that would make +2.5 0 -2.5and then connect the zero to everywhere i currently have ground...? thats probably totally wrong, im trying to get my head around it.
I achieve a range between 0 and 1023 - which is good enough for me.