## AD633ARZ-R7: Technical Overview The **AD633ARZ-R7** is a low-cost, precision four-quadrant analog multiplier manufactured by Analog Devices. It is widely used in signal processing for operations like multiplication, division, squaring, and modulation. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Type** | Four-Quadrant Analog Multiplier | | **Package** | 8-SOIC (Small Outline Integrated Circuit) | | **Supply Voltage (Dual)** | ±8V to ±18V | | **Bandwidth** | 1 MHz | | **Full-Scale Accuracy** | 2% | | **Input Impedance** | 10 MΩ | | **Output Type** | Voltage | | **Operating Temp Range** | -40°C to +85°C | --- ### 2. Functional Description The AD633 works based on a specific transfer function. Unlike many other multipliers, it includes a high-impedance differential input and a summing input ($Z$). #### Transfer Function: The output voltage ($W$) is defined by the following equation: $$W = \frac{(X_1 - X_2)(Y_1 - Y_2)}{10V} + Z$$ * **X & Y Inputs:** Differential inputs where the multiplication occurs. * **10V Scaling:** A built-in buried Zener diode provides a stable 10V scale factor. * **Z Input:** Allows the user to add an external voltage to the product, useful for summing or offsetting. --- ### 3. Pin Configuration (8-SOIC) | Pin # | Symbol | Description | | :--- | :--- | :--- | | 1 | X1 | Multiplicand Non-inverting Input | | 2 | X2 | Multiplicand Inverting Input | | 3 | Y1 | Multiplier Non-inverting Input | | 4 | Y2 | Multiplier Inverting Input | | 5 | -Vs | Negative Supply Voltage | | 6 | Z | Summing Input | | 7 | W | Multiplier Output | | 8 | +Vs | Positive Supply Voltage | --- ### 4. Common Applications * **Modulation & Demodulation:** Creating AM (Amplitude Modulation) signals. * **Voltage Controlled Amplifiers (VCA):** Controlling signal gain via a DC voltage. * **Frequency Doubling:** By connecting the same signal to both X and Y inputs (Squaring). * **Power Measurement:** Calculating $V \times I$ in real-time. * **Filters:** Used in voltage-controlled state-variable filters. --- ### 5. Part Number Breakdown * **AD633:** Base model number. * **A:** Performance grade (Standard). * **R:** Package code (SOIC). * **Z:** RoHS compliant (Lead-free). * **R7:** Packaging format (7-inch Reel, typically 1,000 units).