## ADR03AKS-R2: Low-Noise, Precision Voltage Reference The **ADR03AKS-R2** is a high-precision, bandgap voltage reference produced by **Analog Devices**. It is designed for applications requiring high stability, low noise, and high accuracy in a compact form factor. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.5 V | | **Input Voltage Range** | 4.5 V to 12 V | | **Initial Accuracy** | ±5 mV (0.2%) | | **Temperature Coefficient** | 25 ppm/°C (Max) | | **Output Current Capability** | 10 mA (Source) / 5 mA (Sink) | | **Quiescent Current** | 1 mA (Max) | | **Package Type** | SC70-5 (Small Outline Transistor) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Description The device utilizes a patented temperature drift curvature correction technique and safe-operating-area (SOA) layout techniques to minimize the variations in output voltage over temperature and load changes. #### Core Features: * **Low Noise:** It provides a very "clean" output, typically around $6 \mu V_{p-p}$ ($0.1\text{ Hz to }10\text{ Hz}$), which is critical for high-resolution Data Converters (ADC/DAC). * **High Stability:** Excellent long-term drift characteristics (approx. 50 ppm/1000 hours). * **No External Capacitor Required:** It remains stable without an output capacitor, though one can be added to improve transient response. --- ### 3. Pin Configuration (SC70-5) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **NC** | No Internal Connection | | 2 | **GND** | Ground | | 3 | **NC** | No Internal Connection | | 4 | **Vout** | Reference Voltage Output (2.5V) | | 5 | **Vin** | Input Voltage Supply | --- ### 4. Typical Applications * **Data Acquisition Systems:** Providing the reference for 12-bit to 16-bit ADCs. * **Industrial Process Control:** Precise sensor excitation. * **Precision Instruments:** Handheld meters and calibration equipment. * **Optical Networks:** Monitoring and control circuits. --- ### 5. Implementation Example To use the ADR03AKS-R2, a simple decoupling capacitor is recommended at the input to filter power supply noise. ```c // Schematic Representation [ Vin ]----( 0.1uF Cap to GND )----[ Pin 5 (Vin) ] [ Pin 2 (GND) ]--------------------[ System GND ] [ Pin 4 (Vout) ]-------------------[ ADC Vref Input ] ```