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PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE ISSUE 2 - FEBRUARY 1998 DEVICE DESCRIPTION The ZREF25 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important as well as packages for through hole requirements. The ZREF25 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZREF25 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. ZREF25 FEATURES * * * * * * * * * * * * * * * Small outline SO8 and TO92 style packages. No stabilising capacitor required Typical TC 30ppm/C Typical slope resistance 0.4 2% and 1% 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 are available APPLICATIONS Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. SCHEMATIC DIAGRAM VR G nd 4-271 ZREF25 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, 3 pin (TO92) 500mW 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. I R(min) to IR(max) Slope Resistance Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 10Hz to 10kHz 0.05 30 0.4 0.3 IR=150A LIMITS TYP MAX 2.525 1 2.55 2 50 5 90 2 0.8 V A mA ppm/C TOL. % UNITS 2.475 2.5 2.45 2.5 25 EN Wideband Noise Voltage 45 V(rms) Reverse Current (A) TC = (VR(max)-VR(min)) x 1000000 VR x (T(max)-T(min)) 60 50 40 30 20 10 0 0.2 0.6 1.0 1.4 1.8 2.2 2.6 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) 5C =8 TA 5C C =2 TA -40 = TA Reverse Voltage (V) Reverse Characteristics 4-272 ZREF25 TYPICAL CHARACTERISTICS 1.4 2.53 IR =150A to 5mA Forward Voltage (V) 1.0 0.8 0.6 0.4 0.2 0.1 1 10 100 1000 Reference voltage (V) 1.2 2.52 2.51 2.50 2.49 2.48 2.47 -40 -20 0 20 40 60 80 Forward Current (mA) Temperature (C) Forward Characteristics Temperature Drift 1000 IR=150A Slope resistance () Slope resistance () 1.0 100 10 IR=1mA 0.5 TA=-40C TA=25C TA=85C 0 0.1 1 10 IR=5mA 1 0.1 0.01 0.1 1 10 100 Reference Current (mA) Frequency (kHz) Slope Resistance v Current Slope Resistance v Frequency 3.0 3.0 VR - (V) INPUT 50K OUTPUT VR - (V) 2.0 2.0 INPUT 1K5 OUTPUT 1.0 1.0 0 10 0 10 VIN - (V) VIN - (V) 0 0 1 2 3 4 0 0 0.1 0.2 0.3 0.4 Time (s) Time (s) Transient Response (IR=150A) Transient Response (IR=5mA) 4-273 ZREF25 CONNECTION DIAGRAMS E-Line, 2 pin Package Suffix - Y E-Line, 3 pin,Rev Package Suffix - R Bottom View Bottom View - Pin 3 floating or connected to pin 1 SO8 Package Suffix - N8 Top View ORDERING INFORMATION Part No Tol% Package Partmark ZREF25D02 ZREF25D ZREF25Z02 ZREF25Z ZREF2502 ZREF25 2 1 2 1 2 1 SO8 SO8 E-Line * E-Line * E-Line E-Line ZREF2502 ZREF25 ZREF2502 ZREF25 ZREF2502 ZREF25 * E-Line 3 pin Reversed E-Line 2 pin 4-274 |
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