The **ADR520BRT-R2** is a high-precision, micropower shunt voltage reference manufactured by Analog Devices. It is designed for applications where space is limited and high accuracy is required. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the ADR520BRT-R2: | Feature | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.048 V | | **Initial Accuracy** | ±0.2% (±4 mV) | | **Temperature Coefficient** | 40 ppm/°C | | **Operating Current Range** | 50 µA to 15 mA | | **Output Noise (0.1 Hz to 10 Hz)** | 10 µV p-p | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | SOT-23-3 (RT-3) | --- ### 2. Functional Description As a **shunt voltage reference**, the ADR520 operates similarly to a Zener diode but with much higher precision. - **Shunt Configuration:** It maintains a stable 2.048V across its terminals by diverting (shunting) excess current to ground. It requires an external resistor ($R_{bias}$) to limit the input current. - **No Output Capacitor Required:** Unlike many other references, the ADR520 series is stable without an external output capacitor, though one can be added to reduce noise further. - **Micropower Operation:** It can function with as little as 50 µA of current, making it ideal for battery-powered handheld devices. --- ### 3. Pin Configuration (SOT-23) The device typically utilizes a 3-pin layout: 1. **Pin 1 (Cathode):** The positive terminal of the reference. 2. **Pin 2 (Anode):** The negative terminal, usually connected to ground. 3. **Pin 3 (No Connect):** This pin should be left floating or tied to the anode. --- ### 4. Typical Applications * **Precision Data Acquisition:** Providing a stable reference for 12-bit or 16-bit ADCs/DACs. * **Battery-Powered Instrumentation:** Due to the low minimum operating current. * **Portable Medical Devices:** Where the SOT-23 small footprint is critical. * **Process Control Loops:** Used in 4-20 mA transmitter circuits. --- ### 5. Part Number Breakdown The suffixing provides specific information regarding the packaging and grade: - **ADR520:** Series model (2.048V). - **B:** Denotes high-grade accuracy (±0.2%). - **RT:** Refers to the SOT-23 package. - **R2:** Indicates the tape and reel size (typically 7-inch reel containing 2,000 units).