**ADG731BCPZ: A Comprehensive Technical Overview of Analog Devices' 32-Channel Serial Digital Interface Multiplexer**

The **ADG731BCPZ** from Analog Devices represents a state-of-the-art solution in the realm of high-density signal routing and switching. As a **32-channel single-ended analog multiplexer**, this integrated circuit (IC) is engineered to provide exceptional performance in a wide array of applications, from automated test equipment (ATE) and data acquisition systems to industrial instrumentation and communication infrastructure. Its core function is to sequentially connect one of 32 high-impedance analog inputs to a common output, governed by a sophisticated digital control interface.

A defining characteristic of the ADG731BCPZ is its **serial peripheral interface (SPI)-compatible digital control**. This feature is a significant advantage in modern system design, where minimizing microcontroller pin count and reducing board space are critical. The SPI interface allows for the device's internal register to be programmed using just three wires (clock, data in, and chip select), enabling the selection of any one of the 32 channels with a compact 6-bit binary address. This serial approach drastically simplifies PCB layout and reduces noise compared to parallel control alternatives.

The device is fabricated on Analog Devices' proprietary **iCMOS® (industrial CMOS) manufacturing process**. This technology is pivotal as it enables a unique combination of high performance and low power consumption. The iCMOS process allows the multiplexer to handle **bipolar analog signals ranging from -5 V to +5 V with dual supplies (±2.5 V to ±5.5 V) or unipolar signals from 0 V to 10 V with a single 5 V to 10.5 V supply**. This flexibility makes it suitable for a broad spectrum of signal types. Key analog performance metrics include a very low on-resistance (Ron) of 4.5 Ω typical and exceptionally flat on-resistance (Ron flatness) across the signal range, which minimizes distortion and error in the transmitted signal.

Furthermore, the ADG731BCPZ boasts **break-before-make switching action**, a crucial safety feature that prevents momentary shorting between adjacent input channels during switching transitions, thereby protecting delicate signal sources. The device also offers **latch-up immunity**, a robust feature that ensures the IC is not susceptible to damaging latch-up events caused by overvoltage transients.

Housed in a compact 32-lead **5 mm × 5 mm LFCSP (Lead Frame Chip Scale Package)**, the ADG731BCPZ achieves its high channel count without sacrificing valuable board area. This small form factor is ideal for space-constrained applications. The operational temperature range of -40°C to +85°C ensures reliable performance in harsh industrial environments.

**ICGOODFIND Summary:**

The ADG731BCPZ stands out as a superior high-density multiplexer, integrating 32 channels with an SPI interface for efficient control. Its iCMOS construction delivers a powerful blend of wide voltage range handling, low power, and robust analog performance. For system designers seeking to maximize channel count and minimize digital control complexity in data acquisition and switching systems, this device is an exemplary choice.

**Keywords:**

1. **SPI Interface**

2. **32-Channel Multiplexer**

3. **iCMOS Technology**

4. **Low On-Resistance**

5. **Break-Before-Make**