**ADG428BRZ: A Comprehensive Analysis of the 8-Channel Serial-Controlled Analog Multiplexer**
The **ADG428BRZ** represents a pinnacle of integration and precision in the realm of analog signal switching. As an **8-channel, serially controlled analog multiplexer**, this integrated circuit (IC) is engineered to seamlessly route one of eight analog input signals to a common output, governed by a simple digital serial interface. Its design addresses the critical need for high accuracy, minimal signal distortion, and compact control in sophisticated electronic systems across industrial, communication, and test and measurement applications.
A fundamental strength of the ADG428BRZ lies in its **serial peripheral interface (SPI)-compatible control scheme**. Unlike multiplexers requiring multiple parallel digital lines for channel selection (e.g., 3 address lines for 8 channels), this device utilizes a simple 3-wire serial interface (Data In, Clock, and Chip Select). This drastically reduces the number of required microcontroller GPIO pins, simplifies PCB layout, and minimizes digital noise coupling into sensitive analog paths, which is a paramount concern for signal integrity.
The performance metrics of the ADG428BRZ are tailored for precision applications. It boasts an exceptionally **low on-resistance (Ron) of typically 35 Ω**, which remains remarkably flat across the analog signal range. This low and consistent Ron is crucial as it minimizes voltage drops and signal attenuation, ensuring the multiplexer is virtually transparent in the signal chain. Furthermore, the device exhibits **ultra-low leakage currents**, measured in mere nanoamperes. This characteristic is vital for maintaining the accuracy of high-impedance circuits, such as those found in data acquisition systems and sample-and-hold applications, preventing signal bleed-through and crosstalk between channels.
Beyond basic switching, the ADG428BRZ incorporates several features that enhance system robustness and flexibility. It offers **break-before-make switching action**, a critical safety feature that ensures the currently connected channel is fully disconnected before a new one is engaged. This prevents momentary shorting between analog sources, which could potentially damage external circuitry or corrupt measurements. The device is also designed for a wide dual-supply operation (e.g., ±15 V) or a single-supply operation (up to +36V), providing designers with the flexibility to handle a broad spectrum of analog signal levels, from bipolar audio signals to unipolar sensor outputs.
Housed in a compact **16-lead SOIC package**, the ADG428BRZ is ideal for space-constrained applications without compromising performance. Its operating temperature range is specified for industrial environments, making it a reliable choice for automation, process control, and instrumentation equipment that must perform under varying and often harsh conditions.
In conclusion, the ADG428BRZ stands out as a superior solution for complex analog signal routing challenges. Its combination of serial control, low on-resistance, high accuracy, and robust protection features makes it an indispensable component for designers aiming to achieve high performance and integration in their systems.
**ICGOODFIND**: The ADG428BRZ is a highly integrated, SPI-controlled 8:1 analog multiplexer, celebrated for its **low 35Ω on-resistance**, **ultra-low leakage currents**, and **break-before-make switching**. It is an optimal choice for high-precision data acquisition, automated test equipment, and industrial control systems, offering significant space and control logic savings.
**Keywords**: Analog Multiplexer, SPI Interface, Low On-Resistance, Break-Before-Make, Signal Integrity.
