PRECISION 2.45 VOLT VOLTAGE REFERENCE ZRA245 ISSUE 3 — MARCH 1998 DEVICE DESCRIPTION FEATURES The ZRA245 uses a bandgap circuit design to achieve a precision voltage reference of 2.45 volts. The device is available in small outline surface mount packages, ideal for a p pl i c a t i on s whe re s pac e s av i ng i s important. • • • • • • • The ZRA245 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA245 is recommended for operation between 2mA and 120mA. Small outline SOT23, SO8 and TO92 style package No stabilising capacitor required Typical TC 15ppm/°C Typical slope resistance 0.26Ω ± 3% , 2% and 1% tolerance Industrial temperature range Operating current 2mA to 120mA APPLICATIONS • • • • • • SCHEMATIC DIAGRAM VR 1.25VREF Gnd 4-227 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. ZRA245 Power Dissipation (Tamb=25°C) SOT23 330mW E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 200mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C SYMBOL PARAMETER 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 = CONDITIONS IR=5mA RS = MIN TYP MAX 2.43 2.40 2.38 2.45 2.47 2.45 2.50 2.45 2.52 2 15 IR(min) to IR(max) TOL. % 1 2 3 UNITS V 2 mA 120 mA 50 ppm/°C 0.26 0.5 Ω IR = 5mA f = 100Hz IAC= 0.1 IR 0.28 1 Ω IR = 5mA f = 10Hz to 10kHz 65 (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. § LIMITS VR Change(IR (min) to IR (max)) IR (max) − IR (min) 4-228 µV(rms) ZRA245 TYPICAL CHARACTERISTICS 1.6 2.46 Reference voltage (V) Forward Voltage (V) 1.4 1.2 1.0 0.8 0.6 0.4 1 10 100 2.45 2.44 2.43 -40 1000 -20 Forward Current (mA) 0 20 40 60 80 Temperature (°C) Forward Characteristics Temperature Drift 100 0.6 IR=2mA Slope resistance (Ω) Slope resistance (Ω) TA=-40°C 0.4 TA=25°C 0.2 TA=85°C 10 IR=5mA IR=20mA 1 0 0.1 1 10 0.01 100 0.1 Slope Resistance v Current 3.0 20mA 2.0 2mA 1 10 100 Frequency (KHz) Reference Current (mA) Slope Resistance v Frequency 4.0 3K6 2mA 1.0 Reverse Current (mA) VR - (V) TA=25°C VIN 0.36K 20mA VR 0 VIN - (V) 10 0 2.0 0 0 0 5 10 15 1.0 2.0 20 Reverse Voltage (V) Time (µs) Transient Response Reverse Characteristics 4-229 3.0 ZRA245 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 Top View – Pin 1 floating or connected to pin 2 4-230 ZRA245 ORDERING INFORMATION Part No Tol% Package Partmark Part No Tol% Package Partmark ZRA245A03 3 E-Line • ZRA24503 ZRA245R03 3 E-Line * ZRA245R3 ZRA245A02 2 E-Line • ZRA24502 ZRA245R02 2 E-Line * ZRA245R2 ZRA245A01 1 E-Line • ZRA24501 ZRA245R01 1 E-Line * ZRA245R1 ZRA245F03 3 SOT23 24A ZRA245Y03 3 E-Line † ZRA24503 ZRA245F02 2 SOT23 24B ZRA245Y02 2 E-Line † ZRA24502 ZRA245F01 1 SOT23 24C ZRA245Y01 1 E-Line † ZRA24501 ZRA245N803 3 SO8 ZRA24503 ZRA245N802 2 SO8 ZRA24502 ZRA245N801 1 SO8 ZRA24501 * E-Line 3 pin Reversed † E-Line 2 pin • E-Line 3 pin 4-231