## Overview of ADR02BKS-R2 The **ADR02BKS-R2** is a precision bandgap voltage reference produced by Analog Devices. It is part of the ADR02 family, known for high accuracy, low noise, and excellent stability. This specific part is commonly used in data acquisition systems and high-resolution converters. ### Key Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 5.0 V | | **Input Voltage Range** | 7.0 V to 36 V | | **Temperature Coefficient** | 3 ppm/°C (Typical) | | **Initial Accuracy** | ±0.1% (5 mV) | | **Output Current Capability** | 10 mA (Source) / -5 mA (Sink) | | **Package Type** | SC70-5 (Small Outline Transistor) | | **Operating Temperature** | -40°C to +125°C | --- ### Internal Functional Blocks The ADR02BKS-R2 utilizes a sophisticated architecture to maintain a stable output regardless of external changes: 1. **Bandgap Core:** The heart of the chip that generates a stable voltage based on the physical properties of silicon transistors. 2. **Output Buffer:** A high-gain amplifier that allows the device to drive loads up to 10 mA without dropping the reference voltage. 3. **Trim Circuitry:** Laser-trimmed resistors used during manufacturing to ensure the initial 5.0V output is highly precise. 4. **Temperature Compensation:** Internal circuitry that cancels out the drift caused by changes in ambient temperature. --- ### Pin Configuration (SC70-5) | Pin Number | Mnemonic | Description | | :--- | :--- | :--- | | 1 | **NC** | No Internal Connection | | 2 | **GND** | Ground | | 3 | **TRIM** | Optional output voltage adjustment | | 4 | **$V_{in}$** | Input Voltage Supply | | 5 | **$V_{out}$** | Reference Voltage Output (5.0V) | --- ### Implementation Example To utilize the ADR02BKS-R2 in a standard circuit, decoupling capacitors are recommended for stability and noise reduction. ```cpp // Typical Hardware Setup: // 1. Connect Pin 4 (Vin) to a 7V-36V source. // 2. Place a 0.1uF ceramic capacitor between Vin and GND. // 3. Connect Pin 2 (GND) to System Ground. // 4. Connect Pin 5 (Vout) to the REF input of an ADC. // 5. Place a 0.1uF to 10uF capacitor between Vout and GND. ``` --- ### Typical Applications * **Precision Data Acquisition:** Providing a stable reference for 12-bit to 16-bit ADCs. * **Industrial Process Control:** Used in PLC modules and sensor transmitters. * **Instrumentation:** Digital multimeters and calibration equipment. * **Optical Networks:** Providing bias control for laser diodes.