PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ZR12D ISSUE 3 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES The ZR12D uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.25 volts. The device is available in a small outline SOT23 surface mount package, ideal for applications where space saving is important. • • • • • • • • The ZR12D design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR12D 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 0.65Ω ± 3% tolerance Industrial temperature range Operating current 50µA to 5mA Transient response, stable in less than 10µs Alternative package options and tolerances are available APPLICATIONS • • • • • • SCHEMATIC DIAGRAM V R G nd 4-150 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Data acquisition systems. Precision power supplies. Test equipment. ZR12D 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 IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. IR(min) to IR(max) Slope Resistance RS § IR=150µA LIMITS MIN TYP MAX 1.21 1.25 1.29 30 0.05 30 0.5 EN Wideband Noise Voltage IR = 150µA f = 100Hz to 10kHz 60 § RS = 60 VR x (T(max)−T(min)) 50 Reverse Current (µA) 50 µA 5 mA 90 ppm/°C 1 µV(rms) (VR(max)−VR(min)) x 1000000 VR Change(IR (min) to IR (max)) IR (max) − IR (min) V Ω IR = 1mA f = 100Hz IAC= 0.1 IR Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. 3 Ω Reverse Dynamic Impedance TC = UNITS 0.65 2 ZR † TOL. % 40 30 20 TA 10 C 5° C =8 5° =2 °C TA 40 =TA 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Reverse Voltage (V) Reverse Characteristics 4-151 1.4 ZR12D 1.4 1.27 1.2 1.26 Reference voltage (V) Forward Voltage (V) TYPICAL CHARACTERISTICS 1.0 0.8 0.6 0.4 IR=150µA to 5mA 1.25 1.24 1.23 1.22 1.21 0.2 0.1 1 10 100 -40 1000 -20 0 20 40 60 80 Temperature (°C) Forward Current (mA) Forward Characteristics Temperature Drift 1000 100 Slope resistance (Ω) Slope resistance (Ω) 1.0 TA=-40°C TA=25°C 0.5 TA=85°C IR=150µA 10 IR=1mA IR=5mA 1 0.1 0.01 0 0.1 1 0.1 Reference Current (mA) 100 Slope Resistance v Frequency 1.5 1.5 1.0 VR - (V) VR - (V) 10 Frequency (kHz) Slope Resistance v Current INPUT 58K 0.5 1.0 0 0 10 10 0 0 1 2 3 INPUT 1K8 OUTPUT 0.5 OUTPUT VIN - (V) VIN - (V) 1 10 4 0 0 Time (µs) 2 4 6 Time (µs) Transient Response (IR=150µ µA) Transient Response (IR=5mA) 4-152 8 ZR12D CONNECTION DIAGRAM ORDERING INFORMATION SOT23 Top View – pin 1 floating or connected to Gnd 4-153 Part No Tol % Package Partmark ZR12D 3 SOT23 12E