**ADG5409BRUZ: A Comprehensive Technical Overview of Analog Devices' Precision 8-Channel Multiplexer**

The **ADG5409BRUZ** from Analog Devices represents a state-of-the-art solution in the realm of high-precision analog signal switching. As a monolithic, CMOS-based, **8-channel single-ended analog multiplexer**, it is engineered to deliver exceptional performance in demanding measurement and instrumentation systems. This device is designed to handle both analog and digital signals with high accuracy, making it a cornerstone component for data acquisition systems, automated test equipment (ATE), and medical instrumentation.

A key feature of the ADG5409BRUZ is its **wide bidirectional signal range**, which spans from **VSS to VDD**. This allows it to seamlessly pass analog signals up to the supply rails, a critical capability for maximizing dynamic range in precision applications. The multiplexer operates over a broad power supply range, from ±5 V to ±22 V for dual supplies or +10 V to +44 V for a single supply, offering designers significant flexibility in system architecture.

The integrity of the signal being switched is paramount. The ADG5409BRUZ ensures this with its **low on-resistance of 60 Ω (typical)** and an exceptionally **flat on-resistance profile** across the entire input signal range. This characteristic minimizes signal distortion and errors, which is vital for maintaining accuracy in high-resolution systems. Furthermore, the device boasts **ultra-low leakage currents**, typically just a few picoamperes, which is essential for applications involving high-source impedances or where minimizing signal bleed is critical.

Robustness and system protection are integral to its design. The ADG5409BRUZ incorporates **latch-up immune construction** and is built on an advanced process that provides **overvoltage protection up to -55 V to +55 V**. This means that fault conditions on any disabled channel will not feed through to the common output, thereby safeguarding sensitive downstream components like analog-to-digital converters (ADCs) or operational amplifiers.

Housed in a compact **28-lead TSSOP package**, the ADG5409BRUZ is suitable for space-constrained PCB designs. Its operation is controlled via a standard serial peripheral interface (SPI), enabling simple communication with microcontrollers and digital processors while reducing the number of required GPIO pins. The combination of its electrical performance, protective features, and digital control interface makes it an indispensable component for designing reliable and high-fidelity signal chains.

**ICGOOODFIND**

The ADG5409BRUZ stands out as a premier 8-channel multiplexer, expertly balancing high-voltage operation, precision signal handling, and robust integrated protection. Its superior combination of low on-resistance, minimal leakage, and overvoltage safeguards makes it an ideal choice for designers who will not compromise on accuracy or system reliability in critical applications.

**Keywords:**

1. **Analog Multiplexer**

2. **On-Resistance**

3. **Overvoltage Protection**

4. **Signal Integrity**

5. **SPI Interface**