ZN423

THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS2347 - 3.0 ZN423 PRECISION VOLTAGE REFERENCE SOURCE The ZN423 is a monolithic integrated circuit using the energy bandgap voltage of a base-emitter junction to produce a precise, stable, reference source of 1.26V. This is derived via an external dropping resistor for supply voltages of 1.5V upwards. The temperature coefficient of the ZN423, unlike conventional Zener diodes, remains constant with reference current. the noise figure associated with breakdown mechanisms is also considerably reduced. FEATURES s s s s s s s s Low Voltage Low Temperature Coefficient Very Good Long Term Stability Low Slope Resistance Low RMS Noise Tight Tolerance High Power Supply Rejection Ratio 2-Lead TO-18 Metal Can Package ZN423 (CM-2) Fig.1 Pin connections (bottom view) ABSOLUTE MAXIMUM RATINGS Reference current, IREF Operating temperature range: Storage temperature range: 20mA -55°C to +125°C -65°C to +165°C ORDERING INFORMATION Device Type ZN423 Operating Temperature -55°C to +125°C Package CM2 Fig.2 Circuit diagram ELECTRICAL CHARACTERISTICS Test conditions (unless otherwise stated): Tamb = 25°C, Shaping capacitor, CS = 0.1µF Value Characteristic Symbol Min. Output voltage Slope resistance Reference current Temperature coefficient External resistor RMS noise voltage Power supply ratio VREF RREF IREF REXT PSRR 1.2 1.5 30 100 6 60 Typ. 1.26 0.5 Max. 1.32 1.5 12 V Ω mA Unit Conditions IREF = 5mA ppm...