**ADG428BP: A Comprehensive Analysis of the Monolithic CMOS 8-Channel Analog Multiplexer**

The **ADG428BP** from Analog Devices represents a pinnacle of integration and performance in the realm of analog switching solutions. As a **monolithic CMOS 8-channel analog multiplexer**, it is engineered to handle a wide array of signal routing applications with high precision and reliability. This device is designed to select one of eight bidirectional analog or digital input signals and connect it to a common output, functioning equally well as a demultiplexer. Its architecture is built upon advanced **CMOS technology**, which is the cornerstone of its exceptional performance characteristics, including **very low power consumption** and high switching speeds.

A primary advantage of the CMOS construction is the **extremely high off-isolation and very low on-resistance** (typically 100 ohms). The low on-resistance is remarkably flat across the full analog input range, which is critical for minimizing distortion and signal loss when switching precision analog voltages. This makes the ADG428BP exceptionally suitable for data acquisition systems, where signal integrity is paramount. The device operates from a single **±15 V power supply** for analog signals and a +5 V logic supply, accommodating a broad analog input range of up to ±15 V.

The **break-before-make switching action** is a crucial built-in feature that prevents momentary shorting between channels during switching transitions, thereby protecting both the multiplexer and the source signals. Furthermore, the ADG428BP incorporates **latch-up immune construction**, a vital trait that ensures the device is protected against the damaging effects of latch-up caused by overvoltage signals. This robustness makes it ideal for harsh industrial environments.

Digital control is simplified through a 3-bit binary address line (A0, A1, A2) and an enable pin, allowing for easy interfacing with microprocessors and digital logic circuits. The TTL/CMOS-compatible logic inputs ensure seamless integration into modern digital systems. The device also offers **very low leakage currents**, typically in the nanoampere range, which is essential for applications involving high-impedance sources or sample-and-hold circuits.

Applications for the ADG428BP are vast and varied, spanning from industrial process control and automated test equipment (ATE) to medical instrumentation and communication systems. Its ability to accurately route analog signals without significant degradation makes it a fundamental component in any design requiring high-fidelity signal management.

**ICGOOODFIND:** The ADG428BP stands out as a robust, high-performance, and versatile solution for complex analog signal routing challenges. Its combination of low power, low on-resistance, high integration, and protective features makes it an **indispensable component** for designers aiming to achieve precision and reliability in their systems.

**Keywords:** Analog Multiplexer, CMOS Technology, Low On-Resistance, Break-Before-Make, Latch-Up Immune.