ADR1581 is a 1.25 V micropower, precision shunt voltage reference produced by Analog Devices. It has wide operating range, low initial accuracy, low temperature drift, low output impedance, low wideband noise and high ESD. It is widely used in portable, battery-powered equipment, cellular phones, notebook computers, PDAs, GPSs, DMMs, computer workstations, video RAMDACs, smart industrial transmitters, PCMCIA cards, and automotive.