PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE ZRA125 ISSUE 3 - FEBRUARY 1998 DEVICE DESCRIPTION FEATURES 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 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 ± 3%,2% and 1% tolerance Industrial temperature range Operating current 50µA to 5mA Transient response, stable in less than 10µs Optional extended current range 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 4-222 Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Data acquisition systems. Precision power supplies. Test equipment. ZRA125 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 VR Reverse Breakdown Voltage IR=150µA IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. LIMITS MIN RS § Slope Resistance ZR Reverse Dynamic Impedance EN Wideband Noise Voltage TC = RS = TYP MAX 30 0.05 30 V 50 µA 5 mA 90 ppm/°C IR(min) to IR(max) 0.65 2 Ω IR = 1mA f = 100Hz IAC= 0.1 IR 0.5 Ω IR = 150µA f = 100Hz to 10kHz 60 60 VR x (T(max)−T(min)) 50 VR Change(IR (min) to IR (max)) IR (max) − IR (min) 1 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 1.228 1.24 1.252 1 1.225 1.25 1.275 2 3 1.21 1.25 1.29 Reverse Current (µA) † TOL. % 40 30 20 TA 10 C 5° =8 °C 25 = °C TA 40 =TA 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Reverse Voltage (V) Reverse Characteristics 4-223 1.4 ZRA125 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 1000 -40 -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 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) µA) Transient Response (IR=150µ Transient Response (IR=5mA) 4-224 8 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 4-225 ZRA125 ORDERING INFORMATION Part No Tol % Package Partmark Part No Tol % Package Partmark ZRA125A03 3 E-Line • ZRA12503 ZRA125R03 3 E-Line * ZRA125R3 ZRA125A02 2 E-Line • ZRA12502 ZRA125R02 2 E-Line * ZRA125R2 ZRA125A01 1 E-Line • ZRA12501 ZRA125R01 1 E-Line * ZRA125R1 ZRA125F03 3 SOT23 12A ZRA125Y03 3 E-Line † ZRA12503 ZRA125F02 2 SOT23 12B ZRA125Y02 2 E-Line † ZRA12502 ZRA125F01 1 SOT23 12D ZRA125Y01 1 E-Line † ZRA12501 ZRA125N803 3 SO8 ZRA12503 ZRA125N802 2 SO8 ZRA12502 ZRA125N801 1 SO8 ZRA12501 * E-Line 3 pin Reversed † E-Line 2 pin • E-Line 3 pin 4-226