**ADG608BN: A Comprehensive Guide to the 8:1 CMOS Analog Multiplexer**

In the world of electronic design, the ability to route analog signals accurately and efficiently is paramount. The **ADG608BN** from Analog Devices stands as a quintessential solution, an **8:1 single-ended CMOS analog multiplexer** designed to handle a wide range of applications with high performance and reliability. This integrated circuit (IC) serves as a precision switch, enabling a single output to be connected to one of eight independent input channels, all controlled by a simple digital interface.

The core functionality of the ADG608BN is governed by a 3-bit binary address (A0, A1, A2) and an enable pin (EN). Depending on the address applied, one of the eight analog input channels (S1-S8) is connected to the common output drain (D). A key feature is that **the digital control logic is TTL and CMOS compatible**, ensuring seamless integration with modern microcontrollers, FPGAs, and digital signal processors without requiring level-shifting circuitry. The EN pin acts as a master switch; when set high, all switches are turned off, providing a safe, high-impedance state.

Constructed on a proprietary CMOS process, the ADG608BN excels in several critical performance areas. It boasts **very low power consumption**, typically drawing less than 0.1 µW, making it ideal for battery-powered and portable equipment. Furthermore, it exhibits **low on-resistance (typically 45 Ω)** and remarkably flat on-resistance across the input signal range, which is crucial for minimizing signal distortion and errors in precision measurement systems. The device also offers fast switching speeds, with a turn-on time of approximately 150 ns.

The multiplexer is designed for **bipolar analog signals**, supporting a wide analog signal range from the negative supply voltage (VSS) to the positive supply voltage (VDD). With a recommended dual-supply operation of ±5 V or a single-supply range from +3 V to +15 V, it offers tremendous flexibility for various system architectures. Its **break-before-make switching action** prevents momentary shorting between input channels during switching, protecting both the signal sources and the multiplexer itself.

Applications for the ADG608BN are vast and varied. It is extensively used in:

* **Data Acquisition Systems (DAQ):** For multiplexing analog sensor signals into a single analog-to-digital converter (ADC).

* **Audio and Video Signal Routing:** Switching between different audio or video sources.

* **Automated Test Equipment (ATE):** Directing signals from multiple devices under test to measurement instrumentation.

* **Communication Systems:** Channel selection and frequency band switching.

* **Battery Monitoring Systems:** Sequentially measuring the voltage of individual cells in a stack.

When implementing the ADG608BN, careful attention must be paid to PCB layout and supply decoupling. Placing 0.1 µF bypass capacitors close to the VDD and VSS pins is essential to suppress noise and ensure stable operation. For applications involving high-frequency signals, controlling impedance and minimizing stray capacitance on the analog lines is critical to maintain signal integrity.

ICGOODFIND: The ADG608BN is a robust and versatile CMOS analog multiplexer that combines low power consumption, low on-resistance, and broad signal handling capability. Its ease of use and reliable performance make it an excellent choice for designers who need to accurately route analog signals in a compact and efficient package.

**Keywords:** CMOS Analog Multiplexer, Low On-Resistance, Low Power Consumption, Break-Before-Make, TTL/CMOS Compatible.