The **AD8643ACPZ-R2** is a high-precision, quad-channel, rail-to-rail input and output operational amplifier (op-amp) manufactured by Analog Devices. It belongs to the DigiTrim® family, which utilizes a specialized trimming technique to achieve low offset voltage. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 4 (Quad) | | **Supply Voltage (Single)** | 5V to 26V | | **Supply Voltage (Dual)** | ±2.5V to ±13V | | **Input Offset Voltage** | 70 μV (Maximum) | | **Input Bias Current** | 1 pA (Typical) | | **Bandwidth** | 3.5 MHz | | **Slew Rate** | 2 V/μs | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | LFCSP-16 (3mm x 3mm) | --- ### 2. Core Features and Benefits * **Low Input Bias Current:** Utilizing JFET/CMOS input stages, the bias current is extremely low (pico-ampere range). This makes it ideal for interfacing with high-impedance sensors. * **Rail-to-Rail Input/Output:** It can handle signals that swing across the entire power supply range, maximizing dynamic range in low-voltage systems. * **High Precision:** The low offset voltage and low drift over temperature minimize errors in DC measurement applications. * **Low Power Consumption:** Each amplifier consumes very little current, making it suitable for portable or battery-powered instrumentation. --- ### 3. Pinout Configuration (LFCSP-16) The AD8643ACPZ-R2 uses a Lead Frame Chip Scale Package. Below is the functional breakdown: | Pin Type | Description | | :--- | :--- | | **V+ / V-** | Positive and Negative Power Supply pins. | | **Inputs (+/-)** | Non-inverting and Inverting inputs for each of the 4 amplifiers. | | **Outputs** | Output pins for each of the 4 amplifiers. | | **EP (Exposed Pad)** | Should be connected to V- or left floating (check datasheet for thermal grounding). | --- ### 4. Typical Applications * **Photodiode Transimpedance Amplifiers:** Due to the low input bias current. * **Battery Monitors:** High precision and low power usage. * **Precision Filters:** Suitable for active filtering in medical instrumentation. * **Sensor Signal Conditioning:** Used with thermocouples, RTDs, and strain gauges. --- ### 5. Ordering Information Meaning * **AD8643:** Base model number. * **ACPZ:** "A" denotes the grade; "CP" indicates LFCSP package; "Z" indicates RoHS compliance (Lead-free). * **R2:** Indicates the packaging format (7-inch reel with 250 units).