AD7719BRUZ-REEL

Overview

The AD7719BRUZ-REEL is a low voltage, low power, factory-calibrated 16-/24-bit dual Sigma-Delta analog-to-digital converter (ADC) from Analog Devices Inc. It features two independent ADCs: a 24-bit main channel with a programmable gain amplifier (PGA) and a 16-bit auxiliary channel. The device supports simultaneous sampling and conversion of two signal sources without multiplexer delay. It operates on a single 3 V or 5 V supply, consuming 4.5 mW with both ADCs enabled at 3 V. The part utilizes a 32 kHz crystal with an on-chip PLL and offers software-programmable output data rates up to 105 Hz. It is housed in a 28-lead TSSOP package.

Feature Summary

• Factory-calibrated architecture eliminates the need for field calibration.
• Simultaneous sampling capability allows parallel conversion of two inputs without analog multiplexer latency.
• Integrated signal conditioning includes rail-rail input buffers, programmable gain amplifiers, and matched excitation current sources.
• On-chip functions provide digital I/O ports, temperature sensing, and low-side power switches for system control.

Applications

• Sensor measurement systems
• Temperature measurement applications
• Pressure measurement instrumentation
• Weigh scales
• Portable instrumentation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and reel specifications. Confirm that the component meets RoHS compliance requirements for the intended market. Ensure that the supply voltage ranges align with the system design constraints before procurement.

Selection Notes

Select this component for low-frequency measurement applications requiring high resolution and simultaneous dual-channel acquisition. Consider the available PGA settings and reference input configurations when designing the analog front end. Evaluate the power consumption requirements against the available supply voltage options to optimize system efficiency.

Part Context

The AD7719 belongs to Analog Devices' family of high-resolution, low-bandwidth Sigma-Delta converters. It builds upon previous generations designed for electronic scales and portable instruments. The device integrates a complete analog front end, addressing common design challenges in high-performance data acquisition systems through integrated calibration and signal conditioning.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.

FAQ

How does the AD7719 achieve simultaneous sampling?

The device contains two independent ADCs (24-bit and 16-bit) that allow simultaneous parallel conversion of two input variables, avoiding the delay inherent in analog multiplexing schemes.

What is the purpose of the internal excitation current sources?

The AD7719 includes a pair of switchable matched 200 µA excitation current sources to simplify sensor excitation and improve measurement accuracy when using resistive sensors.

Can the AD7719 operate without external calibration?

Yes, the device is factory-calibrated, which means field calibration is not required for standard operation, although system calibration can be used to further reduce errors.