### Overview: ADR361BUJZ-R2 The **ADR361BUJZ-R2** is a low-power, high-precision **Voltage Reference** integrated circuit manufactured by Analog Devices. It belongs to the ADR36x family, utilizing a bandgap architecture to provide a stable 2.5V output from a higher input voltage. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.5 V | | **Input Voltage Range** | 2.8 V to 15 V | | **Initial Accuracy** | ±0.1% (B Grade) | | **Temperature Coefficient** | 9 ppm/°C | | **Quiescent Current** | 190 µA (Maximum) | | **Output Current Drive** | 5 mA (Source) / 1 mA (Sink) | | **Package / Case** | TSOT-23-5 (Thin SOT) | | **Operating Temperature** | -40°C to +125°C | --- ### Core Functional Components 1. **Bandgap Core:** The heart of the IC, which uses the predictable thermal characteristics of transistors to create a stable reference voltage regardless of temperature or supply fluctuations. 2. **Output Buffer:** An internal operational amplifier that allows the device to drive small loads (up to 5mA) without significantly dropping the output voltage. 3. **Shutdown Pin ($SD$):** This specific model includes a shutdown feature. When pulled low, the device enters a low-power mode, reducing current consumption to less than 3 µA, making it ideal for battery-operated devices. 4. **Trim Circuitry:** Precision laser-trimming is performed during manufacturing to ensure the initial 0.1% accuracy and low thermal drift. --- ### Typical Application Circuit The circuit requires minimal external components for stability. ```text Vin (2.8V - 15V) | +-------[ VIN ]-------+ | | [C1] 0.1uF [ VOUT ]------> Stable 2.5V Output | | GND [C2] 1uF - 10uF (Low ESR Capacitor) | GND ``` --- ### Major Use Cases * **Precision Data Acquisition:** Providing the reference voltage for 12-bit to 16-bit Analog-to-Digital Converters (ADCs). * **Industrial Process Control:** Ensuring accuracy in sensors and transmitters within factory environments. * **Battery Monitoring:** Used in portable medical or handheld test equipment where low power consumption is critical. * **Automotive Systems:** Stable voltage regulation for engine control units and infotainment sensors. ---