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| PRECISION 2.45 VOLT VOLTAGE REFERENCE ISSUE 2 -- FEBRUARY 1998 ZR458 FEATURES DEVICE DESCRIPTION The ZR458 uses a bandgap circuit design to achieve a precision voltage reference of 2.45 volts. The ZR458 design provides a stable voltage without an external capacitor and is stable wi th capaci tive loads. The ZR458 is recommended for operation between 2mA and 120mA. * * * * * * * * * * * * * TO92 style package No stabilising capacitor required Typical TC 15ppm/C Typical slope resistance 0.26 1% tolerance Industrial temperature range (Military temperature range available on request) Operating current 2mA to 120mA Alternative package options and tolerances available Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. APPLICATIONS SCHEMATIC DIAGRAM VR 1.25VREF Gnd 4-196 ZR458 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 200mA 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 ZR458 ZR458A IR(min) to IR(max) 2 IR=5mA 2.43 LIMITS TYP MAX 2.45 2.47 2 120 1 V mA mA TOL. % UNITS 30 15 100 ppm/C 50 RS ZR 0.26 0.5 Reverse Dynamic Impedance IR = 5mA f = 100Hz IAC= 0.1 IR IR = 5mA f = 10Hz to 10kHz 0.28 1 EN Wideband Noise Voltage 65 V(rms) TC = (VR(max)-VR(min)) x 1000000 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) 4-197 ZR458 TYPICAL CHARACTERISTICS 1.6 1.4 1.2 1.0 0.8 0.6 0.4 1 2.46 Reference voltage (V) 10 100 1000 Forward Voltage (V) 2.45 2.44 2.43 -40 -20 0 20 40 60 80 Forward Current (mA) Temperature (C) Forward Characteristics Temperature Drift 100 0.6 TA=-40C IR=2mA Slope resistance () Slope resistance () 0.4 TA=25C 0.2 TA=85C 10 IR=5mA IR=20mA 1 0 1 10 100 0.1 0.01 0.1 1 10 100 Reference Current (mA) Frequency (KHz) Slope Resistance v Current Slope Resistance v Frequency 3.0 20mA 2mA 3K6 2mA 4.0 TA=25C VR - (V) 2.0 VIN 0.36K 20mA 1.0 0 10 VR Reverse Current (mA) 2.0 VIN - (V) 0 0 5 10 15 20 0 0 1.0 2.0 3.0 Time (s) Reverse Voltage (V) Transient Response Reverse Characteristics 4-198 ZR458 CONNECTION DIAGRAMS E-Line, 2 pin, Package Suffix - Y Bottom View ORDERING INFORMATION Part No ZR458 ZR458A E-Line, 2 pin Tol% 1 1 TC Option 100ppm/ C max 50ppm/ C max Package Partmark E-Line ZR458 E-Line ZR458A 4-199 |
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