The **ADA4622-4ACPZ-R2** is a high-precision, quad-channel, Low Bias Current, Rail-to-Rail Output (RRO) Precision Op-Amp manufactured by Analog Devices. It belongs to the ADA4622 family, which is the next generation of the industry-standard OP27/AD712/AD822 series. --- ## 1. Technical Specifications The following table summarizes the key electrical characteristics of the ADA4622-4ACPZ-R2: | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 4 (Quad) | | **Input Type** | JFET (Low Bias Current) | | **Supply Voltage Range** | 5V to 30V (Single) or ±2.5V to ±15V (Dual) | | **Gain Bandwidth Product** | 8 MHz | | **Slew Rate** | 23 V/µs | | **Input Bias Current** | 2 pA (typical) | | **Offset Voltage** | 400 µV (maximum) | | **Quiescent Current** | 715 µA per channel | | **Output Type** | Rail-to-Rail | --- ## 2. Key Features and Benefits * **JFET Input:** The Junction Field-Effect Transistor (JFET) input stage provides extremely low input bias current, making it ideal for high-impedance sensor interfaces. * **High Speed vs. Power:** With an 8 MHz bandwidth and 23 V/µs slew rate, it handles fast signals while consuming relatively low power. * **Low Noise:** It offers low voltage noise (12 nV/√Hz at 1 kHz), which is critical for maintaining signal integrity in precision measurement. * **EMI Filters:** The device includes integrated Electromagnetic Interference (EMI) filters to reduce sensitivity to wireless and radio frequency interference. --- ## 3. Package and Ordering Information The suffix "ACPZ-R2" defines the physical properties and packaging: * **ACPZ:** Refers to the **LFCSP** (Lead Frame Chip Scale Package). This is a very small, thermally efficient surface-mount package. * **R2:** Indicates the tape and reel size (usually a 250-piece reel for small production or prototyping). ### Pin Configuration (Simplified) ```text LFCSP-16 (4x4 mm) ----------------- 1: OUT A 9: -IN C 2: -IN A 10: +IN C 3: +IN A 11: V- 4: V+ 12: +IN D 5: +IN B 13: -IN D 6: -IN B 14: OUT D 7: OUT B 15: NC (No Connect) 8: OUT C 16: Exposed Pad (Connect to V-) ``` --- ## 4. Typical Applications 1. **Photodiode Amplifiers:** Due to the pico-ampere range bias current. 2. **High-Impedance Sensor Interfaces:** Buffering pH probes or capacitive sensors. 3. **Medical Instrumentation:** EEG/ECG pre-amplifiers. 4. **Precision Filters:** Active low-pass or high-pass filters requiring high accuracy.