AD7731BRZ-REEL

Overview

The AD7731BRZ-REEL is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for process control applications. It features a complete analog front-end with a programmable gain amplifier and multiplexer, supporting three differential or five pseudo-differential inputs. The device operates from a single +5 V analog supply and a digital supply ranging from 2.7 V to 5.25 V. It offers programmable output rates up to 6.4 kHz and achieves 16 bits of peak-to-peak resolution at an 800 Hz update rate. The part includes self-calibration capabilities, low offset drift, and a serial interface compatible with microcontrollers.

Feature Summary

• Integrates a programmable gain front end capable of accepting various unipolar and bipolar input ranges directly from transducers.
• Features a proprietary sigma-delta architecture with a programmable digital filter that allows adjustment of cutoff frequency, output rate, and settling time.
• Includes built-in self-calibration and system calibration options to minimize offset and gain errors over temperature and time.
• Provides a flexible serial interface configurable for three-wire operation, ensuring compatibility with standard microcontrollers and DSPs.

Applications

• Process Control Systems
• Programmable Logic Controllers (PLCs)
• Distributed Control Systems (DCS)
• Industrial Instrumentation

Procurement Notes

Verify the specific REEL suffix against the manufacturer's current ordering guide to confirm packaging quantity and RoHS compliance status. Ensure the component matches the B version specifications for industrial temperature range requirements. Cross-reference the datasheet revision date with your design timeline to account for any potential specification updates or lifecycle changes.

Selection Notes

Select this component when high-resolution signal acquisition is required for low-level transducer signals in industrial environments. The integrated buffer and programmable gain stages simplify front-end design by eliminating external amplifiers. Consider the available input ranges and required update rates to ensure the programmable filter settings meet the application's dynamic performance needs.

Part Context

This part belongs to the AD7731 family of 24-bit sigma-delta ADCs manufactured by Analog Devices. It is specifically engineered as a complete analog front-end solution for precision measurement tasks. The BRZ-REEL designation indicates it is supplied in a tape-and-reel format within a 24-lead SOIC package, optimized for automated surface-mount assembly processes.

Replacement Considerations

Direct pin-compatible replacements within the same series include the AD7731BRZ for tube packaging. Verify that alternative packages such as TSSOP (AD7731BRU) maintain the required thermal and mechanical constraints if board space is limited. Ensure any substitute maintains the same voltage supply requirements and serial interface timing characteristics.