**ADG409BRZ-REEL7: A Comprehensive Technical Overview of the 4-Channel Precision CMOS Multiplexer**

The ADG409BRZ-REEL7 is a monolithic, complementary metal-oxide-semiconductor (CMOS) device integrating a precise **4-channel differential multiplexer**. Engineered by Analog Devices, this IC is designed to switch one of four differential inputs to a common differential output, making it an indispensable component in applications demanding high accuracy and signal integrity, such as data acquisition systems, medical instrumentation, and automated test equipment (ATE).

At the heart of the ADG409's design is its **low on-resistance (RON)** of typically 85 Ω, which remains exceptionally flat across the analog input range. This characteristic is paramount as it minimizes signal distortion and ensures linear performance, especially when handling low-level analog signals. The device operates from a single supply voltage ranging from +10.8 V to +16.5 V or dual supplies from ±5 V to ±8 V, offering significant flexibility for various system-level requirements.

A key feature of this multiplexer is its **break-before-make switching action**. This built-in safety mechanism ensures that the existing connection is broken before a new one is established, effectively preventing any momentary shorting of input channels. This is critical for protecting sensitive signal sources and maintaining system integrity during channel switching. Furthermore, the ADG409BRZ boasts an impressive **off-isolation of -100 dB** and a crosstalk figure of -90 dB (at 1 kHz), which are vital metrics for preventing signal bleed-through and ensuring that unwanted signals from unselected channels do not corrupt the output.

The device is built on an enhanced LC²MOS process, which provides a combination of low power consumption (a minuscule 5 μW) and high switching speed. Digital control is achieved through two binary address lines (A0, A1) and an enable pin (EN), which is TTL and CMOS compatible, ensuring easy interfacing with modern microcontrollers and digital signal processors (DSPs). The ADG409BRZ-REEL7 is offered in a compact 16-lead SOIC package and is specified to operate over the industrial temperature range of -40°C to +85°C, ensuring reliability in harsh environments.

**ICGOODFIND**: The ADG409BRZ-REEL7 stands out as a superior solution for high-precision signal routing. Its exceptional combination of **low on-resistance**, **high off-isolation**, and robust break-before-make switching makes it an ideal choice for designers who prioritize signal accuracy, system protection, and operational flexibility in their analog multiplexing applications.

**Keywords**: CMOS Multiplexer, Low On-Resistance, Break-Before-Make, High Off-Isolation, Differential Switching.