**The ADG428BN: A Comprehensive Guide to the 8-Channel CMOS Analog Multiplexer**
In the world of electronic design, the ability to accurately route analog signals is paramount. The **ADG428BN from Analog Devices** stands as a quintessential solution, an 8-channel single-ended analog multiplexer that has become a cornerstone in data acquisition systems, instrumentation, and automated test equipment. This integrated circuit (IC) is engineered to provide high performance and reliability, making it an excellent choice for a wide array of applications.
**Architecture and Core Functionality**
At its heart, the ADG428BN is a **monolithic CMOS device** comprising eight independent switches. A precise digital address, decoded from three select lines (A0, A1, A2), determines which single channel is connected to the common output. An enable pin (EN) is included to disconnect all channels simultaneously, a crucial feature for power-saving modes and system protection. This design allows a single output to sequentially sample up to eight different analog input signals with high accuracy.
**Key Performance Characteristics and Advantages**
The superiority of the ADG428BN is defined by several critical specifications that set it apart from generic multiplexers.
* **Low Power Consumption:** Fabricated in CMOS technology, the device consumes **extremely low quiescent power**, typically in the microwatt range. This makes it ideal for battery-powered and portable equipment where energy efficiency is critical.
* **Low On-Resistance:** A defining feature is its very low on-resistance (Ron), which is typically **below 100 ohms** and exhibits minimal variation across the input signal range. This low and flat Ron ensures minimal signal attenuation and distortion, preserving the integrity of the analog signal being switched.
* **High Off-Isolation and Low Crosstalk:** The ADG428BN excels at isolating turned-off channels from the common output. Its **excellent off-isolation and low crosstalk** characteristics prevent signals from one channel from "bleeding" into another, a vital attribute for maintaining accuracy in multi-channel systems.
* **Break-Before-Make Switching:** The internal switching logic is designed to break the connection to the current channel before making a connection to the new one. This **break-before-make action** prevents momentary shorting between two input channels, which could potentially damage sources or corrupt measurements.
**Application Spotlight**
The robust performance profile of the ADG428BN makes it suitable for a diverse set of applications:
* **Data Acquisition Systems (DAQ):** Used to multiplex analog signals from multiple sensors (e.g., temperature, pressure, strain) into a single analog-to-digital converter (ADC), significantly reducing system cost and complexity.
* **Automated Test Equipment (ATE):** Allows a single measurement instrument, like a digital multimeter or oscilloscope, to automatically test multiple points on a device under test (DUT).
* **Audio and Video Signal Routing:** Employed to switch between different audio or low-frequency video sources.
* **Communication Systems:** Useful for channel selection and routing in various RF and baseband communication setups.
* **Battery Monitoring Systems:** Ideal for sequentially measuring the voltage of individual cells in a large battery stack.
**ICGOODFIND:** The ADG428BN is a high-performance, industry-standard 8-channel analog multiplexer that delivers a winning combination of **low power consumption, low on-resistance, and excellent isolation**. Its robust design and reliability make it a versatile and trusted component for designers who require precise and efficient analog signal switching in demanding applications.
**Keywords:**
1. **CMOS Analog Multiplexer**
2. **Low On-Resistance (Ron)**
3. **Low Power Consumption**
4. **High Off-Isolation**
5. **Break-Before-Make**
