## Overview of AD8672ARM-R2 The **AD8672ARM-R2** is a high-precision, very low noise, dual operational amplifier manufactured by Analog Devices. It is designed for applications requiring high accuracy and low distortion, such as medical instrumentation and professional audio equipment. --- ### Key Specifications The following table summarizes the primary electrical characteristics of the AD8672 series: | Parameter | Specification | | :--- | :--- | | **Number of Channels** | Dual (2) | | **Low Noise** | 2.8 nV/√Hz @ 1 kHz | | **Supply Voltage (Max)** | ±18 V (or 36 V single supply) | | **Offset Voltage** | 100 μV Max | | **Bandwidth** | 10 MHz | | **Slew Rate** | 4 V/μs | | **Package Type** | MSOP-8 (ARM designation) | | **Input Bias Current** | 100 nA Max | --- ### Electronic Features 1. **Low Noise Floor**: At 2.8 nV/√Hz, this op-amp is ideal for amplifying small signals without adding significant background hiss or thermal noise. 2. **Wide Supply Range**: It operates reliably from ±5 V up to ±15 V (or ±18 V absolute max), providing flexibility for industrial power rails. 3. **High Precision**: The low input offset voltage (VOS) and low drift over temperature ensure that DC accuracy is maintained over time. 4. **No Phase Reversal**: The internal design prevents phase reversal when the input voltage exceeds the common-mode range, protecting subsequent stages in the circuit. --- ### Pin Configuration (MSOP-8) The AD8672ARM-R2 follows the standard dual op-amp pinout: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | OUTPUT A | Output of the first amplifier | | 2 | -INPUT A | Inverting input of the first amplifier | | 3 | +INPUT A | Non-inverting input of the first amplifier | | 4 | V- | Negative power supply rail | | 5 | +INPUT B | Non-inverting input of the second amplifier | | 6 | -INPUT B | Inverting input of the second amplifier | | 7 | OUTPUT B | Output of the second amplifier | | 8 | V+ | Positive power supply rail | --- ### Typical Applications * **Precision Filters**: Used in active filters where low distortion is critical. * **Sensor Signal Conditioning**: Interfacing with bridge sensors or photodiodes. * **Audio Preamplifiers**: High-fidelity audio signal processing. * **Medical Equipment**: ECG/EEG amplification and diagnostic tools.