The **ADR525ARTZ-R2** is a high-precision, shunt-mode voltage reference manufactured by Analog Devices. It is designed for space-constrained applications requiring high stability and low power consumption. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the ADR525ARTZ-R2: | Parameter | Value / Description | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.5 V | | **Initial Accuracy** | ±5 mV (0.2%) | | **Temperature Coefficient** | 70 ppm/°C | | **Operating Current Range** | 50 µA to 15 mA | | **Output Noise** | 18 µV p-p (0.1 Hz to 10 Hz) | | **Temperature Range** | -40°C to +85°C | | **Package Type** | SOT-23-3 (Surface Mount) | --- ### 2. Functional Description Unlike series references, the ADR525 is a **Shunt Reference**. This means it operates similarly to a Zener diode but with significantly higher precision. #### How it works: * It maintains a constant 2.5V across its terminals by varying its internal resistance. * It requires an external resistor ($R_{bias}$) connected between the supply voltage and the device to limit the input current. * It is ideal for applications where the input voltage is much higher than the reference voltage or where a negative reference is required. --- ### 3. Pin Configuration The ADR525ARTZ-R2 comes in a 3-pin SOT-23 package: 1. **Pin 1 (Cathode):** The positive terminal of the reference. 2. **Pin 2 (Anode):** The negative terminal, usually connected to Ground (GND). 3. **Pin 3 (No Connect/NC):** This pin should be left floating or tied to the anode. --- ### 4. Application Circuit Example To use the ADR525, you must calculate the external resistor ($R_s$) to ensure the current stays within the 50 µA to 15 mA window. ```text Input Voltage (Vin) ----[ Rs ]----+---- Output (2.5V) | [ ADR525 ] | Ground ``` **Formula for $R_s$:** $R_s = \frac{V_{in(min)} - V_{out}}{I_{load(max)} + I_{q(min)}}$ --- ### 5. Notable Features * **No Output Capacitor Required:** The device is stable without external capacitors, saving board space, though a small capacitor can be added to reduce noise. * **Low Quiescent Current:** It can operate effectively at just 50 µA, making it suitable for battery-powered devices. * **Precision Wide Current Range:** It maintains accuracy even as the shunt current fluctuates between 50 µA and 15 mA.