The **AD8223AR-R7** is an integrated circuit (IC) manufactured by Analog Devices. It belongs to the category of **Instrumentation Amplifiers**. It is specifically designed to be a low-cost, low-power, single-supply rail-to-rail instrumentation amplifier. --- ### ## 1. Key Specifications and Features The AD8223 is widely used because it can amplify small differential signals in the presence of large common-mode voltages. | Feature | Specification | | :--- | :--- | | **Gain Range** | 5 to 1,000 (Set by a single external resistor) | | **Input Type** | Rail-to-Rail (Output), Single-Supply operation | | **Supply Voltage** | 3.0 V to 24 V (Single) or ±1.5 V to ±12 V (Dual) | | **Quiescent Current** | 650 µA (Max) | | **Bandwidth** | 200 kHz (at G=5) | | **Package Style** | 8-Lead SOIC_N (indicated by the 'AR' suffix) | --- ### ## 2. Pin Configuration The device comes in a standard 8-pin package. Below is the functional layout: | Pin Number | Mnemonic | Description | | :--- | :--- | :--- | | 1 | -IN | Inverting Input | | 2 | RG | Gain Setting Pin | | 3 | RG | Gain Setting Pin | | 4 | +IN | Non-inverting Input | | 5 | -VS | Negative Supply | | 6 | REF | Reference Pin (Sets output offset) | | 7 | VOUT | Output | | 8 | +VS | Positive Supply | --- ### ## 3. Setting the Gain The gain is determined by an external resistor ($R_G$) connected between pins 2 and 3. The formula for calculating the gain is: `G = 5 + (200 kΩ / Rg)` If no resistor is used (open circuit), the default gain is **5**. --- ### ## 4. Part Number Breakdown (AD8223AR-R7) The suffix provides specific information about the packaging and grade: * **AD8223**: The base model number. * **A**: Performance grade (standard grade). * **R**: Package type (SOIC - Small Outline Integrated Circuit). * **R7**: Tape and Reel packaging (specifically a 7-inch reel). --- ### ## 5. Typical Applications * **Medical Instrumentation:** ECG and blood pressure monitors. * **Industrial Process Control:** Transducer interfaces (pressure/temperature). * **Precision Data Acquisition:** Interfacing sensors to Analog-to-Digital Converters (ADCs). * **Low-Power Portable Devices:** Due to its low current consumption.