AD680

FEATURES Low quiescent current at 250 μA max Laser trimmed to high accuracy 2.5 V ± 5 mV max (AN, AR grades) Trimmed temperature coefficient 20 ppm/°C max (AN, AR grades) Low noise at 8 μV p-p from 0.1 Hz to 10 Hz 250 nV/√Hz wideband Temperature output pin (N, R packages) Available in three package styles 8-lead PDIP, 8-lead SOIC, and 3-pin TO-92 GENERAL DESCRIPTION The AD680 is a band gap voltage reference that provides a fixed 2.5 V output from inputs between 4.5 V and 36 V. The architecture of the AD680 enables the reference to be operated at a very low quiescent current while still realizing excellent dc characteristics and noise performance. Trimming of the high stability thin-film resistors is performed for initial accuracy and temperature coefficient, resulting in low errors over temperature. The precision dc characteristics of the AD680 make it ideal for use as a reference for DACs that require an external precision reference. The device is also ideal for ADCs and, in general, can offer better performance than the standard on-chip references. Based upon its low quiescent current, which rivals that of many incomplete 2-terminal references, the AD680 is recommended for low power applications, such as hand-held, battery-operated equipment. A temperature output pin is provided on the 8-lead package versions of the AD680. The temperature output pin provides an output voltage that varies linearly with temperature and allows the AD680 to be configured as a temperature transd...