The **AD8274ARZ-R7** is a high-performance, precision difference amplifier designed by Analog Devices. It is particularly valued in industrial and instrumentation applications for its ability to convert differential signals to single-ended signals with high accuracy and low distortion. --- ### ## 1. Key Technical Specifications The table below summarizes the primary electrical characteristics of the AD8274ARZ-R7: | Parameter | Specification | | :--- | :--- | | **Function** | Difference Amplifier / G=2 or G=1/2 | | **Supply Voltage** | ±2.5 V to ±18 V (Dual) or 5 V to 36 V (Single) | | **Bandwidth (-3dB)** | 20 MHz | | **Slew Rate** | 20 V/µs | | **Common-Mode Rejection Ratio (CMRR)** | 90 dB (Minimum) | | **Input Offset Voltage** | 300 µV (Maximum) | | **Package** | SOIC-8 (R7 denotes 7-inch reel tape) | --- ### ## 2. Core Functional Parts & Pins The AD8274 consists of a high-speed op-amp integrated with laser-trimmed, matched resistors. These resistors are the "secret sauce" that provide the high CMRR. | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **-IN** | Inverting Input | | 2 | **REF** | Reference Voltage (sets output offset) | | 3 | **-VS** | Negative Power Supply | | 4 | **NC** | No Connection | | 5 | **OUT** | Signal Output | | 6 | **+VS** | Positive Power Supply | | 7 | **SENSE** | Feedback Path (used to set Gain) | | 8 | **+IN** | Non-Inverting Input | --- ### ## 3. Working Principle The AD8274 can be configured for different gains by changing the wiring of the SENSE and REF pins. 1. **Differential-to-Single-Ended Conversion:** It takes the difference between `+IN` and `-IN`, multiplies it by the gain (G=2 or G=0.5), and references it to the `REF` pin. 2. **Laser-Trimmed Resistors:** Unlike discrete circuits using separate resistors, the internal resistors in the AD8274 are matched to within 0.02% accuracy. This ensures that electrical noise affecting both input lines (Common Mode Noise) is cancelled out effectively. --- ### ## 4. Common Applications * **ADC Driving:** Converting differential sensor signals into a format compatible with Single-Ended Analog-to-Digital Converters. * **Current Sensing:** Measuring voltage drops across shunt resistors in high-side or low-side configurations. * **Audio Line Receivers:** High-fidelity balanced-to-unbalanced signal conversion. * **Industrial Process Control:** Reliable signal transmission in electrically noisy environments. ---