PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE ZR285-2.5 ISSUE 5 – FEBRUARY 1998 DEVICE DESCRIPTION FEATURES The ZR285 uses a bandgap circuit de si g n t o a c h i e v e a p r e c i s i on micropower voltage reference of 2.5 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 ZR285 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR285 is recommended for operation between 20µA and 20mA and so is ideally suited to low power and battery powered applications. Small outline SOT23 and SO8 packages TO92 style packages No stabilising capacitor required Low knee current, 15µA typical Typical TC 30ppm/°C Typical slope resistance 0.4Ω ± 3%, 2% and 1% tolerance Industrial temperature range Operating current 20µA to 20mA APPLICATIONS • • • • • • Excellent performance is maintained to an absolute maximum of 30mA, however the rugged design and 20 volt processing allows the reference to wi t hst an d transi ent 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 4-165 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. ZR285-2.5 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 30mA 25mA -40 to 85°C -55 to 125°C Power Dissipation (Tamb=25°C) SO8 625mW SOT23 330mW E-Line,2 Pin(TO92) 500mW E-Line,3 Pin(TO92) 500mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C SYMBOL PARAMETER CONDITIONS LIMITS MIN VR Reverse Breakdown Voltage IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. 2.525 1 2.55 2 2.575 3 V 20 µA 20 mA 30 90 ppm/°C 0.4 1 Ω 0.8 Ω 13 0.02 IR = 1mA to 20mA RS § Slope Resistance ZR Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR 0.3 EN Wideband Noise Voltage IR = 150µA f = 10Hz to 10kHz 60 † TC = VR x (T(max)−T(min)) 40 30 Reverse Current (µA) RS = µV (rms) (VR(max)−VR(min)) x 1000000 Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. § UNITS TYP MAX 2.475 2.5 2.45 2.5 2.425 2.5 IR=150µA TOL. % VR Change(IR (min) to IR (max)) IR (max) − IR (min) 20 TA=25°C 10 0 0 1.0 2.0 Reverse Voltage (V) Reverse Characteristics 4-166 3.0 ZR285-2.5 TYPICAL CHARACTERISTICS 1.4 2.51 IR=150µA to 5mA Reference voltage (V) Forward Voltage (V) 1.2 1.0 0.8 0.6 0.4 2.50 2.49 2.48 0.2 2.47 0.001 0.01 1 0.1 100 10 -40 -20 0 20 60 40 Forward Current (mA) Temperature (°C) Forward Characteristics Temperature Drift 80 1000 1.4 IR=150µA 85°C 25°C -40°C Slope resistance (Ω) Slope resistance (Ω) 1.2 1.0 0.8 0.6 0.4 100 10 IR=5mA 1 0.2 IR=1mA 1 0.1 10 100 10 100K 10K Slope Resistance v Current Slope Resistance v Frequency VIN (V) VIN (V) 1K Frequency (kHz) 10 10 0 0 ≈ ≈ IR=5mA 2 IR=5mA 3 IR=150µA 2 1 IR=150µA 1 VR (V) VR (V) 100 Reference Current (mA) 0 0 4 8 12 0 0 16 Time (µs) 4 8 12 16 Time (µs) Transient Response - Single pulse Transient Response - Repetitive Test 4-167 ZR285-2.5 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 SOT23 Package Suffix – F SO8 Package Suffix – N8 Top View – Pin 1 floating or connected to pin 2 Top View ORDERING INFORMATION Part No Tol% Package Partmark Part No Tol% Package Partmark ZR285F03 3 SOT23 28A ZR285R01 1 E-Line * ZR28501 ZR285F02 2 SOT23 28B ZR285Y03 3 E-Line † ZR28503 ZR285F01 1 SOT23 28C ZR285Y02 2 E-Line † ZR28502 ZR285N803 3 SO8 ZR285803 ZR285Y01 1 E-Line † ZR28501 ZR285N802 2 SO8 ZR285802 ZR285N801 1 SO8 ZR285801 ZR285R03 3 E-Line * ZR28503 ZR285R02 2 E-Line * ZR28502 * E-Line 3 pin Reversed † E-Line 2 pin 4-168