The ADR290, ADR291 and ADR292 are low noise, micro-power precision voltage references that use an XFET ™ reference circuit. The new XFET ™ architecture offers significant performance improvements over traditional bandgap and Zenerbased references. Improvements include: one quarter the voltage noise output of bandgap references operating at the same current, very low and ultralinear temperature drift, low thermal hysteresis and excellent long-term stability. The ADR29x family are series voltage references providing stable and accurate output voltages from supplies as low as 2.7 V. Out-put voltage options are 2.048 V, 2.5 V and 4.096 V for the ADR290, ADR291 and ADR292 respectively. Quiescent current is only 12 µA, making these devices ideal for battery powered instrumentation. Three electrical grades are available offering initial output accuracies of ±2 mV, ±3 mV and ±6 mV max for the ADR290 and ADR291 and ±3 mV, ±4 mV and ±6 mV max for the ADR292. Temperature coefficients for the three grades are 8 ppm/°C, 15 ppm/°C and 25 ppm/°C max, respectively. Line regulation and load regulation are typically 30 ppm/V and 30 ppm/mA, maintaining the reference's overall high performance. For a device with 5.0 V output, refer to the ADR293 data sheet. The ADR290, ADR291 and ADR292 references are specified over the extended industrial temperature range of -40°C to +125°C. Devices are available in the 8-lead SOIC, 8-lead TSSOP and the TO-92 package.