### Overview of the AD8279ARZ-R7 The **AD8279ARZ-R7** is a low-power, high-performance dual-channel difference amplifier manufactured by Analog Devices. It is specifically designed to simplify the measurement of signals in the presence of high common-mode voltages while maintaining high precision. --- ### Technical Specifications The following table outlines the primary electrical characteristics of the AD8279ARZ-R7: | Parameter | Specification | | :--- | :--- | | **Channels** | Dual (2 Channels) | | **Gain Options** | Fixed Gain of 1/2 (0.5) or 2 | | **Common-Mode Rejection (CMRR)** | 80 dB (Minimum) | | **Bandwidth** | 1 MHz | | **Slew Rate** | 2 V/µs | | **Supply Voltage Range** | ±2 V to ±18 V (Dual) / 4 V to 36 V (Single) | | **Operating Current** | 225 µA per amplifier | | **Package Type** | 14-lead SOIC_N | --- ### Key Internal Components and Features 1. **Laser-Trimmed Resistors**: The device integrates high-precision, thin-film resistors. Because these are laser-trimmed at the factory, they provide excellent gain accuracy and high CMRR, which is difficult to achieve with discrete components. 2. **Difference Amplifier Architecture**: It subtracts two input voltages and multiplies the result by a fixed gain. This is essential for removing ground noise or bias voltages. 3. **Low Power Consumption**: With a maximum quiescent current of 225 µA per channel, it is highly suitable for battery-powered and portable instrumentation. 4. **Integrated Feedback Loop**: No external resistors are required for standard gain configurations, reducing the PCB footprint and potential error sources. --- ### Pin Configuration (Functional) | Pin No. | Name | Description | | :--- | :--- | :--- | | 1, 14 | -IN1 / -IN2 | Inverting Inputs for Channels 1 and 2 | | 2, 13 | +IN1 / +IN2 | Non-Inverting Inputs for Channels 1 and 2 | | 3, 12 | REF1 / REF2 | Reference pins for output level shifting | | 6, 9 | OUT1 / OUT2 | Output pins | | 11 | V+ | Positive Supply Voltage | | 4 | V- | Negative Supply Voltage | --- ### Common Applications * **Voltage Measurement**: Measuring high-side or low-side voltages in power management systems. * **ADC Buffering**: Driving Analog-to-Digital Converters (ADCs) with differential signals. * **Industrial Automation**: Process control loops and sensor signal conditioning. * **Instrumentation**: Portable medical or laboratory equipment requiring low-power differential sensing. ---