## Technical Overview: ADR360AUJZ-R2 The **ADR360AUJZ-R2** is a high-precision, low-power voltage reference manufactured by **Analog Devices**. It belongs to the ADR36x family, known for its small footprint and high stability, making it ideal for battery-powered and space-constrained applications. --- ### 1. Key Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.048 V | | **Input Voltage Range** | 2.3 V to 15 V | | **Initial Accuracy** | ±0.15% (3 mV) | | **Temperature Coefficient** | 25 ppm/°C | | **Supply Current** | 190 µA (Maximum) | | **Output Current Capability** | 5 mA (Source) / 1 mA (Sink) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | TSOT-23-5 (UJ-5) | --- ### 2. Core Functional Components The internal architecture of the ADR360 involves several critical stages to ensure a stable output: 1. **Bandgap Reference Core:** Uses the predictable thermal properties of silicon transistors to create a stable constant voltage. 2. **Error Amplifier:** Monitors the output and adjusts it against the internal reference to maintain the 2.048V level despite load changes. 3. **Output Buffer:** Provides the drive capability to source or sink current without affecting the precision of the reference. 4. **Shutdown Circuitry:** Includes a shutdown pin (optional in some variants) to reduce current consumption to less than 1 µA. --- ### 3. Application Use Cases Because the output voltage is exactly **2.048 V**, it is specifically designed for 12-bit Analog-to-Digital Converters (ADCs). In a 12-bit system, 2.048 V creates an easy-to-calculate **LSB (Least Significant Bit) size of exactly 0.5 mV**. * **Portable Instrumentation:** Handheld meters and battery-operated sensors. * **Data Acquisition Systems:** Providing a steady reference for precision ADCs and DACs. * **Industrial Process Control:** Used in 4-20mA loop-powered transmitters. * **Automotive Systems:** Battery monitoring and ECU sensor referencing. --- ### 4. Implementation Example (Basic Circuit) To use the ADR360, a decoupling capacitor is recommended at the input and output for stability. ```c // Connection Logic: Pin 1 (VIN): Connect to 2.3V - 15V Source (0.1uF Cap to GND) Pin 2 (GND): Connect to System Ground Pin 3 (EN): Connect to VIN to Enable (or Logic High) Pin 4 (NC): No Connection Pin 5 (VOUT): 2.048V Precision Output (0.1uF to 10uF Cap to GND) ``` ---