### ADR435BRMZ-R7 Technical Overview The **ADR435BRMZ-R7** is a high-precision, low-noise XFET® (eXtra implanted junction FET) voltage reference. It is widely used in applications requiring high stability and low power consumption. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 5.0 V | | **Initial Accuracy** | ±2 mV (0.04%) | | **Temperature Coefficient** | 3 ppm/°C (Max) | | **Operating Supply Voltage** | 7.0 V to 18 V | | **Output Current Capability** | +30 mA (Source) / -20 mA (Sink) | | **Quiescent Current** | 800 µA (Max) | | **Package Type** | MSOP-8 (Surface Mount) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Features * **XFET Technology:** Unlike standard Zener or Bandgap references, the XFET architecture provides lower noise, better long-term stability, and lower thermal hysteresis. * **Low Noise:** It features very low peak-to-peak noise (typically 8 µV p-p at 0.1 Hz to 10 Hz), making it ideal for high-resolution Data Converters (ADCs/DACs). * **High Output Drive:** The device can source up to 30 mA, often eliminating the need for an external buffer amplifier when driving heavy loads. * **Trim Terminal:** Includes a specific pin (Pin 5) that allows for fine-tuning the output voltage without affecting the temperature coefficient. --- ### 3. Pin Configuration (MSOP-8) | Pin Number | Mnemonic | Description | | :--- | :--- | :--- | | 1 | TP | Test Point (Do not connect) | | 2 | VIN | Input Voltage Supply | | 3 | TP | Test Point (Do not connect) | | 4 | GND | Ground | | 5 | TRIM | Output Voltage Trim | | 6 | VOUT | Reference Voltage Output | | 7 | COMP | Compensation (Optional) | | 8 | NC | No Internal Connection | --- ### 4. Common Applications * **Precision Data Acquisition:** Providing a stable reference for 16-bit to 24-bit ADCs. * **Medical Instrumentation:** High-stability requirements for monitoring equipment. * **Industrial Process Control:** Reliable voltage standards for sensors and actuators. * **Optical Control Circuits:** Precise biasing for laser diodes and optical sensors. --- ### 5. Implementation Example To utilize the ADR435 in a basic circuit, a 0.1 µF capacitor is typically placed on the input, and a 1 µF to 10 µF capacitor is placed on the output for stability and noise reduction. ```c // Design Note: // Ensure Vin is at least 2V higher than Vout (Vin >= 7V) // for the ADR435 to maintain regulation. ```