ADR420(421).pdfa Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References ADR420/ADR421/ADR423/ADR425 FEATURES PIN CONFIGURATION Low Noise (0.1 Hz to 10 Hz) ADR420: 1.75 V p-p 8-Lead SOIC ADR421: 1.75 V p-p 8-Lead MSOP ADR423: 2.0 V p-p ADR425: 3.4 V p-p Low Temperature Coefficient: 3 ppm/ C ……