## Overview of the ADR361AUJZ-R2 The **ADR361AUJZ-R2** is a low-power, high-precision **Voltage Reference** integrated circuit manufactured by Analog Devices. It belongs to the ADR36x family, known for its small footprint and excellent temperature stability. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.5 V | | **Input Voltage Range** | 2.8 V to 15 V | | **Output Current** | 5 mA (Source) / 2 mA (Sink) | | **Temperature Coefficient** | 25 ppm/°C (Maximum) | | **Initial Accuracy** | ±0.2% (5 mV) | | **Quiescent Current** | 190 µA (Maximum) | | **Package Type** | TSOT-23-5 (UJ-5) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Electronic Components The internal architecture of the ADR361AUJZ-R2 consists of several critical electronic stages: 1. **Bandgap Reference Core:** The heart of the chip that generates a stable 2.5V output by balancing the negative temperature coefficient of a P-N junction against the positive temperature coefficient of a PTAT (Proportional To Absolute Temperature) current. 2. **Error Amplifier:** High-gain circuitry that compares the output voltage to the internal reference, ensuring the output remains constant despite fluctuations in load or input voltage. 3. **Output Buffer:** A low-impedance stage that allows the device to drive capacitive loads and provide up to 5mA of current without significant voltage drops. 4. **Trimming Circuitry:** During manufacturing, the device undergoes "laser trimming" to adjust internal resistors, achieving the high initial accuracy (0.2%). --- ### 3. Pin Configuration (TSOT-23-5) | Pin Number | Mnemonic | Description | | :--- | :--- | :--- | | 1 | **$V_{in}$** | Input Voltage Supply | | 2 | **GND** | Ground | | 3 | **EN** | Enable Pin (Active High) | | 4 | **NC** | No Connect | | 5 | **$V_{out}$** | Reference Output Voltage | --- ### 4. Typical Application Circuit To ensure the best performance, the following external components are typically used: ```c // Recommended External Components - Input Capacitor (Cin): 0.1 µF to 10 µF (Ceramic) - Output Capacitor (Cout): 0.1 µF to 10 µF (Low ESR) - Enable Pin: Connect to Vin for continuous operation ``` --- ### 5. Common Use Cases * **Precision Data Converters:** Providing the reference voltage for 12-bit to 16-bit ADCs and DACs. * **Battery Powered Systems:** Due to its low quiescent current (190 µA). * **Industrial Process Control:** Reliable performance in harsh temperature environments. * **Automotive Systems:** Used in sensors requiring stable voltage rails.