AD7719BRZ

Overview

The AD7719BRZ is a low voltage, low power, factory-calibrated analog front end containing two independent sigma-delta ADCs with 24-bit and 16-bit resolutions. It operates from a single 3 V or 5 V supply, consuming 4.5 mW at 3 V with both converters enabled. The device features a programmable gain amplifier (PGA) on the main channel, switchable 200 µA excitation current sources, low-side power switches, a temperature sensor, and a 4-bit digital I/O port. It supports output data rates up to 105 Hz and utilizes a 32.768 kHz crystal with an on-chip PLL. The component is housed in a 28-lead SOIC package.

Feature Summary

• Dual-channel architecture enabling simultaneous sampling and conversion of two signal sources without multiplexing delay.
• Factory calibration eliminates the need for field calibration, ensuring stable gain and minimal offset.
• Integrated signal conditioning includes a rail-rail input buffer, programmable gain amplifier, and dual matched excitation current sources.
• On-chip functions provide system integration through a temperature sensor, low-side power switches, and a digital I/O port.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Confirm that the component meets RoHS compliance requirements for the intended deployment region. Ensure that the supply voltage levels align with the specified operational limits before integration into the final design.

Selection Notes

Select this component for low-frequency measurement applications requiring high resolution and simultaneous multi-channel acquisition. The integrated PGA and excitation sources simplify designs involving resistive sensors like RTDs or strain gauges. Consider the available interface modes when interfacing with microcontrollers or DSPs to ensure timing compatibility.

Part Context

The AD7719 belongs to Analog Devices' family of high-resolution, low-bandwidth sigma-delta converters. It builds upon previous generations by adding dual-channel capability and additional on-chip peripherals. This evolution addresses common challenges in high-performance data acquisition system design, offering a complete solution for precision sensing tasks.

Replacement Considerations

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