PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ZR423 ISSUE 3 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES The ZR423 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.25 volts. The device is available in a TO92 style package for through hole requirements. • • • • • • The ZR423 design provides a stable voltage without an external capacitor and is stable wi th capaci tive loads. The ZR423 is recommended for operation between 50µA and 5mA and so is ideally suited to low power and battery powered applications. • • • Excellent performance is maintained to an absolute maximum of 25mA, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds. TO92 style package No stabilising capacitor required Typical TC 30ppm/°C Typical slope resistance 0.65Ω ± 3% tolerance Industrial temperature range (Military temperature range available on request) Operating current 50µA to 5mA Transient response, stable in less than 10µs Alternative package options and tolerances available APPLICATIONS • • • • • SCHEMATIC DIAGRAM V R G nd 4-185 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Data acquisition systems. Precision power supplies. ZR423 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) E-Line, 2 pin (TO92) 500mW 25mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C SYMBOL PARAMETER VR Reverse Breakdown Voltage IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. RS § Slope Resistance ZR Reverse Dynamic Impedance EN Wideband Noise Voltage TC = IR=150µA RS = TOL. % MIN TYP MAX 1.21 1.25 1.29 0.05 30 UNITS 3 V 50 µA 5 mA 90 ppm/°C IR(min) to IR(max) 0.65 2 Ω IR = 1mA f = 100Hz IAC= 0.1 IR 0.5 Ω IR = 150µA f = 100Hz to 10kHz 60 60 VR x (T(max)−T(min)) 50 VR Change(IR (min) to IR (max)) IR (max) − IR (min) 1 µV(rms) (VR(max)−VR(min)) x 1000000 Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. § LIMITS 30 Reverse Current (µA) † CONDITIONS 40 30 20 TA 10 C 5° C =8 5° =2 °C TA 40 =TA 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Reverse Voltage (V) Reverse Characteristics 4-186 1.4 ZR423 1.4 1.27 1.2 1.26 Reference voltage (V) Forward Voltage (V) TYPICAL CHARACTERISTICS 1.0 0.8 0.6 0.4 IR=150µA to 5mA 1.25 1.24 1.23 1.22 1.21 0.2 0.1 1 10 100 -40 1000 -20 0 20 40 60 80 Temperature (°C) Forward Current (mA) Forward Characteristics Temperature Drift 1000 100 Slope resistance (Ω) Slope resistance (Ω) 1.0 TA=-40°C TA=25°C 0.5 TA=85°C IR=150µA 10 IR=1mA IR=5mA 1 0.1 0 0.01 0.1 1 0.1 Reference Current (mA) 100 Slope Resistance v Frequency 1.5 1.5 1.0 VR - (V) VR - (V) 10 Frequency (kHz) Slope Resistance v Current INPUT 58K 0.5 1.0 OUTPUT 0 0 10 10 0 0 1 2 3 INPUT 1K8 OUTPUT 0.5 VIN - (V) VIN - (V) 1 10 4 0 0 Time (µs) 2 4 6 Time (µs) Transient Response (IR=150µ µA) Transient Response (IR=5mA) 4-187 8 ZR423 CONNECTION DIAGRAMS E-Line, 2 pin, Package Suffix – Y Bottom View ORDERING INFORMATION Part Number Tol% Package Partmark ZR423 3 E-Line † ZR423 † E-Line, 2 pin 4-188