genarating +/- 5V with a common ground
Aside from the obvious general answers of using a 7660 charge pump or making a dual supply with a transformer and 7805/7905, you can make a charge pump with a single gate buffer and drive a couple ceramic caps and a BAT54 dual Schottky. Very tiny and very cheap- it will give you -3V or better, which is typically good enough, depending on your range. The actual current drawn on the minus supply is about 1mA. 

You can drive the buffer with the clock output of the chip, so this is a solution that is specific to the this particular situation.  

If you didn't follow what I wrote, you can find a circuit using inverters in some versions the datasheet, just modernize it by using the single gate buffer and dual Schottky diodes.