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| PRECISION 2.45 VOLT VOLTAGE REFERENCE ISSUE 2 -- FEBRUARY 1998 ZR404 FEATURES DEVICE DESCRIPTION The ZR404 uses a bandgap circuit design to achieve a precision voltage reference of 2.45 volts. The device is available in small outline s ur f a ce mo u n t p a c k a g e s , i d e a l for a p pl i c a t i on s whe re s pac e s av i ng i s important as well as a 2 pin TO92 style package for through hole requirements. The ZR404 design provides a stable voltage without an external capacitor and is stable wi th capaci tive loads. The ZR404 is recommended for operation between 2mA and 120mA. * * * * * * * * * * * * * * Small outline SO8 and TO92 style packages No stabilising capacitor required Typical TC 15ppm/C Typical slope resistance 0.26 3% tolerance Industrial temperature range (Military temperature range available on request) Operating current 2mA to 120mA Alternative package options and tolerances are available APPLICATIONS Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. SCHEMATIC DIAGRAM VR 1.25VREF Gnd 4-169 ZR404 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 SO8 625mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C SYMBOL PARAMETER CONDITIONS MIN VR IMIN IR TC RS ZR Reverse Breakdown Voltage Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance 2 IR=5mA 2.38 LIMITS TYP MAX 2.45 2.52 2 120 3 V mA mA TOL. % UNITS 15 IR(min) to IR(max) IR = 5mA f = 100Hz IAC= 0.1 IR IR = 5mA f = 10Hz to 10kHz 50 ppm/C 0.26 0.5 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) 4-170 ZR404 TYPICAL CHARACTERISTICS 1.6 1.4 1.2 1.0 0.8 0.6 0.4 1 2.46 Reference voltage (V) Forward Voltage (V) 2.45 2.44 10 100 1000 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 2.0 VIN 0.36K 20mA 1.0 0 10 VR Reverse Current (mA) VR - (V) 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 4-171 ZR404 CONNECTION DIAGRAMS E-Line, 2 pin Package Suffix - V SO8 Package Suffix - D Bottom View Top View ORDERING INFORMATION Part No Tol% Package Partmark ZR404 ZR404D E-Line 2 pin 3 3 E-Line SO8 ZR404 ZR404 4-172 |
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