## AD8667ARMZ-REEL Technical Overview The **AD8667ARMZ-REEL** is a high-precision, dual-channel, rail-to-rail output operational amplifier manufactured by **Analog Devices**. It belongs to the DigiTrim® family, which utilizes a specialized electronic trimming technique to achieve high accuracy without the need for laser trimming. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 2 (Dual) | | **Supply Voltage (Single)** | 5V to 16V | | **Supply Voltage (Dual)** | ±2.5V to ±8V | | **Input Offset Voltage** | 600 µV (Max) | | **Input Bias Current** | 1 pA (Typical) | | **Bandwidth (Gain-Bandwidth)** | 540 kHz | | **Slew Rate** | 0.3 V/µs | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | MSOP-8 (Micro Small Outline Package) | --- ### 2. Core Features * **Rail-to-Rail Output:** The output swing can reach very close to the supply rails (typically within millivolts), maximizing the dynamic range, especially in low-voltage systems. * **Low Input Bias Current:** Utilizing CMOS inputs, the device features extremely low bias current (pA range). This makes it ideal for applications involving high-impedance sensors or photodiode preamps. * **High Precision:** The DigiTrim technology ensures low offset voltage and low drift over temperature, reducing the need for system-level calibration. * **Low Power Consumption:** With a typical supply current of only 230 µA per amplifier, it is well-suited for battery-powered or portable equipment. --- ### 3. Pin Configuration (MSOP-8) | Pin Number | Symbol | Description | | :---: | :--- | :--- | | 1 | **OUT A** | Output of Amplifier A | | 2 | **-IN A** | Inverting Input A | | 3 | **+IN A** | Non-inverting Input A | | 4 | **V-** | Negative Power Supply / Ground | | 5 | **+IN B** | Non-inverting Input B | | 6 | **-IN B** | Inverting Input B | | 7 | **OUT B** | Output of Amplifier B | | 8 | **V+** | Positive Power Supply | --- ### 4. Common Applications 1. **Sensor Interfaces:** Ideal for pH probes, thermocouples, and pressure sensors due to high input impedance. 2. **Medical Instrumentation:** Used in ECG/EKG and portable monitoring devices where precision and low power are critical. 3. **Data Acquisition:** Acts as a buffer or gain stage for Analog-to-Digital Converters (ADCs). 4. **Photodiode Amplifiers:** The low bias current prevents errors in light-to-voltage conversion. --- ### 5. Part Number Breakdown: AD8667ARMZ-REEL * **AD8667:** The core model number. * **A:** Performance grade (Standard). * **RM:** Package code for **MSOP**. * **Z:** RoHS Compliant (Lead-free). * **REEL:** Indicates the packaging format (13-inch Tape and Reel, typically 3,000 pieces). Note: `R2` variants usually refer to smaller 7-inch reels.