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]