The **REF02AUG4** is a high-precision voltage reference integrated circuit. It is part of the widely used REF02 family, known for providing a stable +5.0V output with low drift and high accuracy. --- ### 1. Key Technical Specifications The "AU" suffix typically denotes the package type (SOIC), while "G4" indicates a Green/RoHS compliant part with specific lead finishing. | Parameter | Value / Description | | :--- | :--- | | **Output Voltage** | +5.0 V | | **Input Voltage Range** | 7.0 V to 40 V | | **Temperature Drift** | 10 ppm/°C (Typical) | | **Output Current** | 10 mA (Max) | | **Supply Current** | 1.4 mA | | **Package Type** | 8-Pin SOIC (Surface Mount) | | **Operating Temp** | -40°C to +85°C | --- ### 2. Primary Functional Features The REF02AUG4 is more than just a standard voltage regulator; it includes several precision features: * **Trim Pin (V_TRIM):** Allows for fine-tuning the output voltage (±6%) using an external potentiometer to compensate for system errors. * **Temperature Output (TEMP):** Provides a voltage proportional to the ambient temperature (approx. 2.1 mV/°C), allowing the chip to act as a temperature sensor. * **High Line/Load Rejection:** Ensures the 5V output remains stable even if the input power supply fluctuates or the output load changes. * **Low Noise:** Designed to minimize electrical noise, making it ideal for high-resolution Data Converters (ADCs/DACs). --- ### 3. Pin Configuration (8-Pin SOIC) | Pin # | Symbol | Function | | :--- | :--- | :--- | | 1 | NC | No Internal Connection | | 2 | V_IN | Input Voltage (7V to 40V) | | 3 | TEMP | Temperature Sensor Output | | 4 | GND | Ground | | 5 | TRIM | Output Voltage Adjustment | | 6 | V_OUT | +5.0V Precision Output | | 7 | NC | No Internal Connection | | 8 | NC | No Internal Connection | --- ### 4. Common Applications * **A/D Converters:** Provides the reference voltage for 12-bit to 16-bit ADCs. * **Precision Instrumentation:** Used in multimeters and weighing scales where accuracy is critical. * **Portable Systems:** Due to its low power consumption and wide input range. * **Industrial Controls:** Stable performance in fluctuating thermal environments. --- ### 5. Circuit Implementation Example ```python # Simple Connection Logic 1. Connect Pin 2 (Vin) to a DC source (e.g., 12V). 2. Connect Pin 4 (GND) to System Ground. 3. Place a 0.1uF capacitor between Pin 2 and Pin 4 for noise filtering. 4. Pin 6 (Vout) provides the stable 5V reference to your sensors/MCU. ```