PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ZRA124 ISSUE 3 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES The ZRA124 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.24 volts. The device is available in small outline surface mount packages, ideal for applications where space saving is important, as well as packages for through hole requirements. • • • • • • • • The ZRA124 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA124 is recommended for operation between 50µA and 5mA and so is ideally suited to low power and battery powered applications. Small outline SOT23, SO8 and TO92 style packages No stabilising capacitor required Typical TC 30ppm/°C Typical slope resistance 0.65Ω ± 1% tolerance Industrial temperature range Operating current 50µA to 5mA Transient response, stable in less than 10µs 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. • • • • • SCHEMATIC DIAGRAM V R G nd 4-218 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Precision power supplies. Test equipment. Data acquisition systems ZRA124 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25°C) SOT23 330mW 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 SYMBOL PARAMETER CONDITIONS LIMITS MIN TOL.% UNITS TYP MAX 1 VR Reverse Breakdown Voltage IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. IR(min) to Co. IR(max) 30 RS § Slope Resistance 0.65 2 Ω ZR Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR 0.5 Ω EN Wideband Noise Voltage IR = 150µA f = 100Hz to 10kHz 60 TC = IR=150µA 30 0.05 60 VR x (T(max)−T(min)) 50 Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. § VR Change(IR (min) to IR (max)) RS = IR (max) − IR (min) V 50 µA 5 mA 90 ppm/°C 1 µV(rms) (VR(max)−VR(min)) x 1000000 Reverse Current (µA) † 1.228 1.24 1.252 40 30 C 5° C =8 5° TA =2 A °C T 40 =TA 20 10 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Reverse Voltage (V) Reverse Characteristics 4-219 1.4 ZRA124 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 0.01 0.1 1 0.1 100 Slope Resistance v Frequency Slope Resistance v Current 1.5 1.5 1.0 VR - (V) VR - (V) 10 Frequency (kHz) Reference Current (mA) 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) 4-220 8 ZRA124 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 E-Line, 3 pin Package Suffix – A SO8 Package Suffix – N8 Bottom View – Pin 1 floating or connected to pin 3 Top View SOT23 Package Suffix – F ORDERING INFORMATION Top View – Pin 1 floating or connected to pin 2 Part No Tol% Package Partmark ZRA124A01 1 E-Line • ZRA12401 ZRA124F01 1 SOT23 12C ZRA124N801 1 SO8 ZRA12401 ZRA124R01 1 E-Line * ZRA124R1 ZRA124Y01 1 E-Line † ZRA12401 * E-Line 3 pin Reversed † E-Line 2 pin • E-Line 3 pin 4-221