AD7739BRU-REEL

Overview

The AD7739BRU-REEL is an 8-channel, high-throughput, 24-bit Sigma-Delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates with a single 5 V analog supply and supports digital supplies of either 3 V or 5 V. The device features configurable inputs for eight single-ended or four fully differential channels, offering input ranges of ±625 mV, ±1.25 V, and ±2.5 V. It utilizes a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. Key performance metrics include 24 bits of resolution with no missing codes, integral nonlinearity of ±0.0015% FSR, and power dissipation ranging from 50 mW to 100 mW depending on the mode. It functions within an industrial temperature range of –40°C to +105°C.

Feature Summary

• High-resolution 24-bit ADC architecture optimized for fast channel switching and multiplexing applications.
• Configurable analog front end supporting eight single-ended or four fully differential input channels with multiple voltage ranges.
• Integrated system calibration capabilities including per-channel zero-scale and full-scale calibration options.
• Flexible digital interface with Schmitt-triggered logic inputs, compatible with standard serial protocols.

Applications

• Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCSs)
• Industrial instrumentation requiring high precision
• Process control systems

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to tape-and-reel packaging when sourcing components. Confirm that the manufacturer designation matches Analog Devices Inc. to ensure authenticity. Check for RoHS compliance status if required by your assembly specifications. Ensure the revision level aligns with your design documentation requirements before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring high throughput across multiple channels without sacrificing resolution. Consider the AD7738 if higher speed is needed at the cost of increased leakage current. Choose the AD7734 for applications requiring wider input voltage ranges up to ±10 V. Evaluate the power consumption differences between chopping enabled and disabled modes based on your noise sensitivity requirements.

Part Context

The AD7739 belongs to the AD773x family of high-precision analog front ends from Analog Devices. This family includes variants such as the AD7732, AD7734, and AD7738, which offer different channel counts and input configurations. The AD7739 specifically targets applications needing eight single-ended inputs with high-speed switching capabilities, distinguishing it from the differential-focused AD7732 and the wide-input AD7734.

Replacement Considerations

Public confirmed substitute part numbers: AD7738BRUZ, AD7734BRUZ, AD7732BRU.

FAQ

What is the maximum output data rate achievable with the AD7739?

The maximum output data rate is approximately 15 kHz, depending on the selected conversion time and filter word settings.

Can the AD7739 operate with a single-supply configuration?

Yes, the AD7739 supports single-supply operation with a 5 V analog supply and a digital supply of either 3 V or 5 V.

How does the chopping feature affect performance?

Enabling chopping reduces offset drift but increases conversion time, while disabling chopping allows for faster throughput at the expense of slightly higher offset drift.