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| PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ISSUE 2 - FEBRUARY 1997 DEVICE DESCRIPTION The ZRA125 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.25 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 ZRA125 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA125 is recommended for operation between 50A and 5mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to a suggested 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. ZRA125 * * * * * * * * * * * * * Typical TC 30ppm/C Typical slope resistance 0.65 3%,2% and 1% tolerance Industrial temperature range Operating current 50A to 5mA Transient response, stable in less than 10s Optional extended current range Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Data acquisition systems. Precision power supplies. Test equipment. APPLICATIONS FEATURES * * Small outline SOT23, SO8 and TO92 style packages No stabilising capacitor required SCHEMATIC DIAGRAM V R G nd 1 - 24 ZRA125 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) SOT23 330mW E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C SYMBOL PARAMETER CONDITIONS MIN VR Reverse Breakdown Voltage IR=150A 1.228 1.225 1.21 0.05 30 LIMITS TYP MAX 1.24 1.252 1.25 1.275 1.25 1.29 30 50 5 90 1 2 3 V TOL. % UNITS IMIN IR TC Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR Wideband Noise Voltage IR = 150A f = 100Hz to 10kHZ IR(min) to IR(max) A mA ppm/C RS ZR 0.65 2 0.5 1 EN 40 V(rms) 60 Reverse Current (A) TC = VR Change x 1000000 VR x Temperature Change 50 40 30 VR Change (IR (min) to IR (max)) RS = IR (max) - IR (min) 20 T) =8 C 5 )= 2 5 C 0 -4 C 10 T T )= 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Reverse Voltage (V) Reverse Characteristics 1 - 45 ZRA125 TYPICAL CHARACTERISTICS 1.4 1.27 IR=150A to 5mA Reference voltage (V) Forward Voltage (V) 1.2 1.26 1.0 1.25 0.8 1.24 0.6 1.23 1.22 0.4 0.2 0.1 1 10 100 1000 1.21 -40 -20 0 20 40 60 80 Forward Current (mA) Temperature (C) Forward Characteristics Temperature Drift 1000 1.0 Slope resistance () 100 Slope resistance () TA=-40C I4=150A 10 I4=1mA 0.5 TA=25C TA=85C 1 I4=5mA 0.1 0 0.1 1 10 0.01 0.1 1 10 100 Reference Current (mA) Frequency (kHz) Slope Resistance v Current Slope Resistance v Frequency 1.5 1.5 VR - (V) 1.0 VR - (V) INPUT 58K O UTPUT 1.0 INPUT 1 K8 O UTPUT 0.5 0.5 0 0 - (V) VI N 0 1 2 3 4 VI 0 - (V) N 10 10 0 0 2 4 6 8 Time (s) Time (s) Transient Response (I4=150A) Transient Response (I4=5mA) 1 - 26 ZRA125 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 ZRA125 ORDERING INFORMATION Part No ZRA125A03 ZRA125A02 ZRA125A01 ZRA125F03 ZRA125F02 ZRA125F01 ZRA125N803 ZRA125N802 ZRA125N801 Tol% Package 3 2 1 3 2 1 3 2 1 E-Line * E-Line * E-Line * SOT23 SOT23 SOT23 SO8 SO8 SO8 Partmark ZRA12503 ZRA12502 ZRA12501 12A 12B 12D ZRA12503 ZRA12502 ZRA12501 Part No ZRA125R03 ZRA125R02 ZRA125R01 ZRA125Y03 ZRA125Y02 ZRA125Y01 Tol% Package 3 2 1 3 2 1 E-Line * E-Line * E-Line * E-Line E-Line E-Line Partmark ZRA125R3 ZRA125R2 ZRA125R1 ZRA12503 ZRA12502 ZRA12501 * E-Line 3 pin Reversed E-Line 2 pin * E-Line 3 pin |
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