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| PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ISSUE 3 - FEBRUARY 1998 DEVICE DESCRIPTION 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 50A 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. ZR423 FEATURES * * * * * * * * * * * * * * TO92 style package No stabilising capacitor required Typical TC 30ppm/C Typical slope resistance 0.65 3% tolerance Industrial temperature range (Military temperature range available on request) Operating current 50A to 5mA Transient response, stable in less than 10s Alternative package options and tolerances available APPLICATIONS Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Data acquisition systems. Precision power supplies. SCHEMATIC DIAGRAM V R G nd 4-185 ZR423 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) E-Line, 2 pin (TO92) 500mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C SYMBOL PARAMETER CONDITIONS MIN VR IMIN IR TC Reverse Breakdown Voltage Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance Wideband Noise Voltage IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 100Hz to 10kHz IR(min) to IR(max) 0.65 2 0.5 1 0.05 30 IR=150A 1.21 LIMITS TYP MAX 1.25 1.29 30 50 5 90 3 V A mA ppm/C TOL. % UNITS RS ZR EN 60 V(rms) Reverse Current (A) TC = (VR(max)-VR(min)) x 1000000 60 50 40 30 20 TA C 5 C =8 5 =2 C TA 40 =TA VR x (T(max)-T(min)) Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. RS = VR Change(IR (min) to IR (max)) IR (max) - IR (min) 10 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Reverse Voltage (V) Reverse Characteristics 4-186 ZR423 TYPICAL CHARACTERISTICS 1.4 1.27 Reference voltage (V) Forward Voltage (V) 1.2 1.0 0.8 0.6 0.4 0.2 0.1 1 10 100 1000 1.26 1.25 1.24 1.23 1.22 1.21 -40 -20 0 IR=150A to 5mA 20 40 60 80 Forward Current (mA) Temperature (C) Forward Characteristics Temperature Drift 1000 1.0 Slope resistance () 100 Slope resistance () TA=-40C TA=25C TA=85C IR=150A 10 IR=1mA 0.5 1 IR=5mA 0.1 0 0.01 0.1 1 10 0.1 1 10 100 Reference Current (mA) Frequency (kHz) Slope Resistance v Current Slope Resistance v Frequency 1.5 1.5 VR - (V) 1.0 VR - (V) INPUT 58K OUTPUT 1.0 INPUT 1K8 OUTPUT 0.5 0.5 0 0 VIN - (V) 0 0 1 2 3 4 VIN - (V) 10 10 0 0 2 4 6 8 Time (s) Time (s) Transient Response (IR=150A) Transient Response (IR=5mA) 4-187 ZR423 CONNECTION DIAGRAMS E-Line, 2 pin, Package Suffix - Y Bottom View ORDERING INFORMATION Part Number ZR423 E-Line, 2 pin Tol% Package Partmark 3 E-Line ZR423 4-188 |
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