ANALOG DEVICES REF43: 2.5 V Low Power Precision Voltage Reference Data Sheet (Rev D 2004-08-01-) handbook
Datasheet
REF43 is a low power precision reference providing a stable 2.5 V output independent of variations in supply voltage, load conditions or ambient temperature. It is suitable as a reference level for 8-, 10- and 12-bit data acquisition systems, or wherever a stable, known voltage is required.