The LM392 series consists of 2 independent building block circuits One is a high gain internally frequency compensated operational amplifier and the other is a precision voltage comparator Both the operational amplifier and the voltage comparator have been specifically designed to operate from a single power supply over a wide range of voltages Both circuits have input stages which will common-mode input down to ground when operating from a single power supply Operation from split power supplies is also possible and the low power supply current is independent of the magnitude of the supply voltage