PRECISION 5.0 VOLT MICROPOWER VOLTAGE REFERENCE ZREF50 ISSUE 2 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES • The ZREF50 uses a bandgap circuit design to achieve a precision micropower voltage reference of 5.0 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 ZREF50 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZREF50 is recommended for operation between 50µA and 15mA 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. Small outline SO8 and TO92 style packages No stabilising capacitor required Typical TC 15ppm/°C Typical slope resistance 0.33Ω 1% tolerance Industrial temperature range (Military temperature range available on request) Operating current 50µA to 15mA Transient response, stable in less than 10µs Alternative package options and tolerances are available APPLICATIONS • • • • • SCHEMATIC DIAGRAM V R G nd 4-275 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. ZREF50 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW 25mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C 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 = (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) CONDITIONS IR=150µA LIMITS TOL. % UNITS MIN TYP MAX 4.95 5.0 5.05 30 50 µA 15 mA 50 ppm/°C 0.05 15 IR(min) to IR(max) 1 V 0.33 1.5 Ω IR = 1mA f = 100Hz IAC= 0.1 IR 0.4 Ω IR = 150µA f = 10Hz to 10kHz 105 1 µV(rms) 60 Reverse Current (µA) SYMBOL PARAMETER 50 40 TA=85°C 30 20 10 TA=-40°C 0 0 2.0 4.0 Reverse Voltage (V) Reverse Characteristics 4-276 6.0 ZREF50 TYPICAL CHARACTERISTICS 5.02 1.6 IR=150µA to 15mA Reference voltage (V) Forward Voltage (V) 1.4 1.2 1.0 0.8 0.6 5.00 4.98 4.96 0.4 0.1 1 10 100 1000 -20 -40 Forward Current (mA) 0 20 40 60 80 Temperature (°C) Forward Characteristics Temperature Drift 3.0 1000 Slope resistance (Ω) Slope resistance (Ω) IR=150µA 2.0 TA=-40°C 1.0 TA=25°C TA=85°C 0 100 IR=5mA 10 1 0.1 1 0.1 10 0.01 100 0.1 1 10 100 Frequency (kHz) Reference Current (mA) Slope Resistance v Current Slope Resistance v Frequency 6.0 6.0 5 mA 4.0 4.0 150 µA VR - (V) 2.0 33K 150µA VR 0 10 10 0 0 500 1000 VIN 1K 5mA 2.0 0 VIN - (V) VIN - (V) VR - (V) VIN 1K 5mA VR 0 0 Time (µs) 33K 150µA 1 2 3 Time (µs) Transient Response (Single Pulse) Transient Response (Repetitive Pulse) 4-277 4 ZREF50 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 ZREF50D 1 SO8 ZREF50 ZREF50Z 1 E-Line * ZREF50 ZREF50 1 E-Line † ZREF50 * E-Line 3 pin Reversed † E-Line 2 pin 4-278