The **AD8628WAUJZ-R7** is a high-precision, zero-drift operational amplifier (Op-Amp) manufactured by Analog Devices. It is specifically designed for applications requiring extreme accuracy and stability over time and temperature. --- ## 1. Core Technical Specifications The AD8628 series is famous for its **Chopper-Stabilized** architecture, which virtually eliminates input offset voltage and drift. | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 1 (Single) | | **Supply Voltage (Single)** | 2.7V to 5.0V | | **Supply Voltage (Dual)** | ±1.35V to ±2.5V | | **Offset Voltage (Max)** | 1 μV | | **Offset Drift (Max)** | 0.005 μV/°C | | **Gain Bandwidth Product** | 2.5 MHz | | **Slew Rate** | 1 V/μs | | **Rail-to-Rail** | Input and Output (RRIO) | | **Automotive Qualified** | Yes (AEC-Q100) | --- ## 2. Key Features and Benefits ### A. Zero-Drift Technology The internal "chopper" mechanism constantly self-corrects the input offset voltage. This makes it ideal for sensing very small DC signals (like those from a shunt resistor or thermocouple) where even a tiny error could ruin the measurement. ### B. No 1/f Noise (Flicker Noise) Unlike standard CMOS Op-Amps, the AD8628 eliminates the low-frequency noise (1/f noise) that typically plagues precision circuits. This results in a very "clean" DC measurement. ### C. Automotive Grade (WAUJZ) The "W" in the part number indicates it is **Automotive Grade**. - **Temperature Range:** Operates from –40°C to +125°C. - **Reliability:** Qualified for use in harsh automotive environments (powertrain, sensor interfaces). --- ## 3. Part Number Breakdown: AD8628WAUJZ-R7 | Segment | Meaning | | :--- | :--- | | **AD8628** | Base Model (Zero-Drift Op-Amp) | | **W** | Automotive Grade (AEC-Q100 Qualified) | | **AUJZ** | Package Code (TSOT-23 / Thin SOT-23, 5-lead) | | **R7** | Packaging Style (7-inch Reel, typically 3,000 units) | --- ## 4. Typical Applications * **Precision Current Sensing:** Used in battery management systems (BMS) for EVs. * **Thermocouple/RTD Amplifiers:** For highly accurate temperature readings. * **Medical Instrumentation:** Low-power, high-accuracy heart rate or pressure monitors. * **Strain Gage Sensors:** Measuring physical stress or weight with minimal error. ---