## Overview of ADR821BRMZ-R2 The **ADR821BRMZ-R2** is a high-precision, low-power voltage reference and temperature sensor integrated into a single chip. Manufactured by **Analog Devices**, it belongs to a family of devices designed to provide stable voltage outputs for precision analog-to-digital (ADC) and digital-to-analog (DAC) conversion systems. --- ### Technical Specifications The table below outlines the core electronic parameters of the ADR821BRMZ-R2: | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.5 V | | **Input Voltage Range** | 3.0 V to 15 V | | **Initial Accuracy** | ±0.1% (High Precision) | | **Temperature Coefficient** | 50 ppm/°C | | **Quiescent Current** | 400 µA (max) | | **Output Current Drive** | 5 mA | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | MSOP-8 (Micro Small Outline Package) | --- ### Key Electronic Features 1. **Dual Functionality**: Unlike standard references, this part provides both a stable **2.5V reference** and a **Temperature Output pin**. The voltage at the TEMP pin is proportional to the absolute temperature, allowing the system to monitor thermal conditions without an external thermistor. 2. **Low Dropout**: It can maintain a stable output with an input voltage as low as 500mV above the output voltage (dropout voltage), which is ideal for battery-powered devices. 3. **High Stability**: The device is engineered to minimize "hysteresis" (output shifts after temperature cycling) and long-term drift, ensuring the system remains calibrated over time. 4. **Wide Input Range**: While it outputs 2.5V, it can handle input spikes or higher rail voltages up to 15V, providing flexibility in power supply design. --- ### Pin Configuration (MSOP-8) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | NC | No Connect | | 2 | VIN | Input Voltage | | 3 | TEMP | Temperature Sensor Output | | 4 | GND | Ground | | 5 | TRIM | Fine Adjustment of $V_{out}$ (Optional) | | 6 | VOUT | 2.5V Reference Output | | 7 | COMP | Compensation (Optional external capacitor) | | 8 | NC | No Connect | --- ### Common Applications * **Precision Data Acquisition**: Used as the reference for 12-bit to 16-bit ADCs. * **Battery Monitoring**: Low power consumption makes it suitable for portable medical or industrial handhelds. * **Industrial Controls**: Used in PLC (Programmable Logic Controller) analog I/O modules. * **Optical Networks**: Precise laser diode biasing and monitoring.