Hi My Dear friends
all thanks for yor help.
I am using NMA1215D to various voltages for amplifiers as it requires +/-9V to 15V. That's why.
Another thing I have NMA0505SC. It seems that I cannot get +/-5V from it. I connected it to 5V supply and obtained them directly without any additions of components. All I get is +/-7 to 8V. What could be the problems?
I am using it for SPI analysing (FTDIchip DLP2232M Module) and I am using that DC-DC converter for isolation and protection.