AD7731BR-REEL7

Overview

The AD7731BR-REEL7 is a complete analog front-end for process control applications, featuring a proprietary programmable gain front end that accepts low-level signals directly from transducers. It utilizes a sigma-delta architecture with an analog modulator and a low-pass programmable digital filter to adjust cutoff frequency, output rate, and settling time. The device includes three buffered differential programmable gain analog inputs configurable as five pseudo-differential inputs, alongside a differential reference input. Operating from a single +5 V supply, it supports seven unipolar and bipolar ranges from ±20 mV to ±1.28 V. Peak-to-peak resolution reaches 16 bits at 800 Hz output rate, switching between channels with 1 ms settling time while maintaining 13-bit performance.

Feature Summary

• Features a programmable gain front end accepting multiple signal ranges directly from transducers.
• Includes self-calibration and system calibration options with low offset and gain drift.
• Supports FASTStep mode for rapid channel sequencing and fast settling times.
• Integrates burnout currents for easy detection of open-circuit transducers.

Applications

• Process Control
• PLCs/DCS
• Industrial Instrumentation

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and reel configuration. Ensure compatibility with required operating temperature ranges and voltage supplies. Cross-reference part numbers with manufacturer databases to avoid counterfeit components. Confirm RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select based on required input range configurations and necessary sampling rates. Consider the availability of internal versus external calibration methods for precision requirements. Evaluate power consumption constraints, particularly regarding standby mode capabilities. Ensure interface compatibility with existing microcontrollers or DSPs using the serial communication protocol.

Part Context

The AD7731 series represents Analog Devices' solution for high-precision data acquisition in industrial environments. It combines analog signal conditioning with digital filtering in a single component. This integration reduces board space and simplifies design complexity for multi-channel measurement systems requiring high accuracy and stability over temperature variations.

Replacement Considerations

Direct replacements include AD7731BRZ-REEL7 and AD7731BRU-REEL7 within the same family. Verify pin compatibility and electrical specifications before substitution. Ensure the alternative package matches the PCB footprint requirements. Check for any differences in calibration features or interface timing characteristics.