The purpose of this application note is to inform the system designer how to use the HI7190 with a single +5V analog supply if a -5V analog supply is not available. An inexpensive low current negative power supply can be generated with the ICL7660S voltage converter. The ICL7660S Voltage Converter is a monolithic CMOS voltage conversion IC. The device performs supply voltage conversion from positive to negative for an input range of 1.5V to 12V, resulting in complementary output voltages of -1.5V to -12V. Only 2 noncritical external capacitors are needed for the charge pump and charge reservoir functions. The conversion chip contains a series DC power supply regulator, RC oscillator, voltage level translator, and four output power MOS switches. For detailed chip information please refer to the ICL7660S datasheet.[1]