**ADG409BRU: A Comprehensive Technical Overview of the Quad SPST CMOS Analog Switch**

The **ADG409BRU** is a monolithic CMOS device integrating four independent single-pole/single-throw (SPST) analog switches. Designed for precision signal routing in a wide array of applications, this switch is renowned for its **exceptionally low power consumption and high switching speed**. Fabricated on an advanced CMOS process, it offers a compelling combination of performance and reliability for modern electronic systems.

A key architectural feature of the ADG409BRU is its **dual supply operation, typically ranging from ±5V to ±20V**, or a single supply from +5V to +40V. This flexibility makes it suitable for interfacing with both high-voltage industrial signals and lower-voltage logic levels. Each switch conducts current equally well in either direction when on, presenting a typical on-resistance (**R_ON**) of **less than 35Ω**, which remains fairly flat across the entire analog input range. This low and consistent R_ON is critical for minimizing signal distortion and power loss.

The device boasts **TTL and CMOS-compatible digital inputs**, ensuring seamless interfacing with modern microcontrollers, FPGAs, and logic circuits without requiring level-shifting components. The digital control logic is simple: a high-level input closes its corresponding switch. An important characteristic is the **break-before-make switching action**, a vital safety feature that prevents momentary shorting between channels during the switching process.

Beyond its core switching function, the ADG409BRU excels in its electrical specifications. It features **very low leakage currents, typically just a few nanoamperes**, which is paramount for maintaining signal integrity in high-impedance circuits, such as those found in precision data acquisition systems and sample-and-hold applications. Furthermore, its **fast switching times, with t_ON typically around 150ns**, enable it to handle dynamic signals effectively.

The device is offered in a compact 16-lead TSSOP package (RU), making it ideal for space-constrained PCB designs. Its robust design ensures **latch-up immunity under any circumstance**, a common concern with CMOS devices.

**ICGOOODFIND**: The ADG409BRU stands out as a superior solution for precision signal routing, offering an optimal blend of low on-resistance, wide voltage range handling, fast switching, and minimal power consumption. Its high performance and reliability make it an indispensable component in test equipment, audio and video routing, automated test equipment (ATE), and data acquisition systems.

**Keywords**: CMOS Analog Switch, Low On-Resistance, Break-Before-Make, Low Power Consumption, Dual Supply Operation.