PRECISION 2.45 VOLT VOLTAGE REFERENCE ZR404 ISSUE 2 — FEBRUARY 1998 DEVICE DESCRIPTION FEATURES 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 0.26Ω ± 3% tolerance Industrial temperature range (Military temperature range available on request) Operating current 2mA to 120mA Alternative package options and tolerances are available APPLICATIONS • • • • • • SCHEMATIC DIAGRAM VR 1.25VREF Gnd 4-169 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. ZR404 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) E-Line, 2 pin (TO92) 500mW SO8 625mW 200mA 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 = CONDITIONS IR=5mA RS = MIN TYP MAX 2.38 2.45 2.52 2 15 IR(min) to IR(max) TOL. % 3 UNITS V 2 mA 120 mA 50 ppm/°C 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. § LIMITS VR Change(IR (min) to IR (max)) IR (max) − IR (min) 4-170 µV(rms) ZR404 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 10 100 0.01 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 4-171 3.0 ZR404 CONNECTION DIAGRAMS E-Line, 2 pin Package Suffix – V Bottom View SO8 Package Suffix – D Top View ORDERING INFORMATION Part No Tol% Package Partmark ZR404 3 E-Line † ZR404 ZR404D 3 SO8 ZR404 † E-Line 2 pin 4-172