PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE ZR25D ISSUE 2 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES The ZR25D uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. The device is available in a small outline SOT23 surface mount package, ideal for applications where space saving is important. • • • • • • • • The ZR25D design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR25D is recommended for operation between 50µA 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. Small outline SOT23 package. No stabilising capacitor required Typical TC 30ppm/°C Typical slope resistance 0.4Ω ± 3%, 2% and 1% tolerance Industrial temperature range Operating current 50µA to 5mA Transient response, stable in less than 10µs Alternative package options available APPLICATIONS • • • • • • SCHEMATIC DIAGRAM VR G nd 4-161 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. ZR25D ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) SOT23 330mW 25mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C SYMBOL PARAMETER CONDITIONS VR Reverse Breakdown Voltage IR=150µA IMIN Minimum Operating Current IR Recommended Operating Current TC † RS § Average Reverse Breakdown Voltage Temp. Co. I R(min) to IR(max) Slope Resistance ZR Reverse Dynamic Impedance EN Wideband Noise Voltage LIMITS MIN TC = 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) TYP MAX V 2.475 2.5 2.45 2.5 2.425 2.5 50 µA 5 mA 30 90 ppm/°C 0.4 2 Ω IR = 1mA f = 100Hz IAC= 0.1 IR 0.3 0.8 Ω IR = 150µA f = 100Hz to 10kHz 45 25 0.05 µV(rms) 60 (VR(max)−VR(min)) x 1000000 VR x (T(max)−T(min)) UNITS 2.525 1 2.55 2 2.575 3 Reverse Current (µA) † TOL. % 50 40 30 5°C =8 TA 5°C C =2 TA -40° = TA 20 10 0 0.2 0.6 1.0 1.4 1.8 2.2 Reverse Voltage (V) Reverse Characteristics 4-162 2.6 ZR25D 1.4 2.53 1.2 2.52 IR =150µA to 5mA Reference voltage (V) Forward Voltage (V) TYPICAL CHARACTERISTICS 1.0 0.8 0.6 0.4 0.2 2.51 2.50 2.49 2.48 2.47 0.1 1 10 100 -40 1000 -20 0 Forward Current (mA) 20 40 60 80 Temperature (°C) Forward Characteristics Temperature Drift 1000 0.5 TA=-40°C TA=25°C Slope resistance (Ω) Slope resistance (Ω) I R=150µA 1.0 100 IR=1mA 10 IR=5mA 1 TA=85°C 0.1 0 0.1 1 10 0.01 0.1 Slope Resistance v Current 100 3.0 VR - (V) 2.0 INPUT 50K 1.0 OUTPUT 2.0 1K5 0 10 10 0 0 1 2 3 INPUT 1.0 0 VIN - (V) VR - (V) 10 Slope Resistance v Frequency 3.0 VIN - (V) 1 Frequency (kHz) Reference Current (mA) OUTPUT 0 0 4 Time (µs) 0.1 0.2 0.3 Time (µs) µA) Transient Response (IR=150µ Transient Response (IR=5mA) 4-163 0.4 ZR25D CONNECTION DIAGRAMS SOT23 ORDERING INFORMATION Part No Tol% Package Partmark ZR25D 3 SOT23 25N ZR25D02 2 SOT23 25P ZR25D01 1 SOT23 25R Top View – pin 1 floating or connected Gnd 4-164