The **AD8628AUJ-R2** is a high-precision, zero-drift operational amplifier (Op-Amp) manufactured by **Analog Devices**. It is widely recognized for its ultra-low offset voltage and long-term stability. --- ### ## Key Technical Specifications The following table summarizes the primary electrical characteristics of the AD8628AUJ-R2: | Parameter | Specification | | :--- | :--- | | **Architecture** | Zero-Drift (Chopper Stabilized) | | **Supply Voltage** | 2.7 V to 5.0 V | | **Offset Voltage (Max)** | 1 µV | | **Offset Drift (Max)** | 0.005 µV/°C | | **Bandwidth** | 2.5 MHz | | **Slew Rate** | 1.0 V/µs | | **Input Bias Current** | 30 pA | | **Package Type** | TSOT-23-5 | | **Operating Temperature** | -40°C to +125°C | --- ### ### Core Features and Benefits 1. **Zero-Drift Technology**: The "chopper-stabilized" architecture constantly corrects internal error voltages. This results in an incredibly low input offset voltage (typically less than 1 µV) and eliminates 1/f noise (flicker noise), making it ideal for DC precision. 2. **Rail-to-Rail Input/Output (RRIO)**: The device can handle input and output signals that span the full range of the power supply, which is critical for low-voltage systems (like 3.3V or 5V rails). 3. **Low Noise**: Unlike standard amplifiers, the AD8628 does not suffer from the high noise levels usually found at low frequencies, making it perfect for sensing very small signals over long periods. 4. **No External Capacitors**: While older chopper-stabilized amps required external capacitors to store offset correction voltages, the AD8628 integrates this internally, saving PCB space. --- ### ### Common Applications * **Pressure and Strain Sensors**: Amplifying micro-volt signals from bridges. * **Precision Current Sensing**: Used with shunt resistors for high-side or low-side monitoring. * **Medical Instrumentation**: ECG/EKG monitors where high precision and low noise are mandatory. * **Thermocouple Amplifiers**: Handling the tiny voltages generated by temperature probes without adding offset error. --- ### ### Pin Configuration (TSOT-23-5) ```text AD8628 (Top View) +-------+-------+ OUT 1| |5 V+ | V- 2| | | +IN 3| |4 -IN | +-------+-------+ ``` ---