PRECISION 2.45 VOLT VOLTAGE REFERENCE ZR458 ISSUE 2 — FEBRUARY 1998 DEVICE DESCRIPTION FEATURES 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 0.26Ω 1% tolerance Industrial temperature range (Military temperature range available on request) Operating current 2mA to 120mA Alternative package options and tolerances available APPLICATIONS • • • • • SCHEMATIC DIAGRAM VR 1.25VREF Gnd 4-196 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. ZR458 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) E-Line, 2 pin (TO92) 500mW 200mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C CONDITIONS SYMBOL PARAMETER VR Reverse Breakdown Voltage IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. 2.43 2.45 2.47 2 1 UNITS V 2 mA 120 mA ZR458A IR(min) to IR(max) 15 50 ppm/°C Reverse Dynamic Impedance EN Wideband Noise Voltage 0.26 0.5 Ω IR = 5mA f = 100Hz IAC= 0.1 IR 0.28 1 Ω IR = 5mA f = 10Hz to 10kHz 65 (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 = TYP MAX 100 ZR § MIN 30 Slope Resistance TC = TOL. % ZR458 RS § † IR=5mA LIMITS VR Change(IR (min) to IR (max)) IR (max) − IR (min) 4-197 µV(rms) ZR458 TYPICAL CHARACTERISTICS 1.6 2.46 Reference voltage (V) Forward Voltage (V) 1.4 1.2 1.0 0.8 0.6 0.4 1 10 100 2.45 2.44 2.43 -40 1000 -20 Forward Current (mA) 0 20 40 60 80 Temperature (°C) Forward Characteristics Temperature Drift 100 0.6 IR=2mA Slope resistance (Ω) Slope resistance (Ω) TA=-40°C 0.4 TA=25°C 0.2 TA=85°C 10 IR=5mA IR=20mA 1 0 0.1 1 10 0.01 100 0.1 Slope Resistance v Current 3.0 20mA 2.0 2mA 1 10 100 Frequency (KHz) Reference Current (mA) Slope Resistance v Frequency 4.0 3K6 2mA 1.0 Reverse Current (mA) VR - (V) TA=25°C VIN 0.36K 20mA VR 0 VIN - (V) 10 0 2.0 0 0 0 5 10 15 1.0 2.0 20 Reverse Voltage (V) Time (µs) Transient Response Reverse Characteristics 4-198 3.0 ZR458 CONNECTION DIAGRAMS E-Line, 2 pin, Package Suffix – Y Bottom View ORDERING INFORMATION Part No Tol% TC Option Package Partmark ZR458 1 100ppm/ °C max E-Line † ZR458 ZR458A 1 50ppm/ °C max E-Line † ZR458A † E-Line, 2 pin 4-199