AD7719BRUZ

Overview

The AD7719BRUZ is a low voltage, low power, factory-calibrated dual Sigma-Delta analog-to-digital converter (ADC) from Analog Devices Inc. It integrates two independent ADCs: a 24-bit main channel and a 16-bit auxiliary channel. The device operates on a single 3 V or 5 V supply with typical normal mode current consumption of 1.5 mA at 3 V. It features a programmable gain front end, simultaneous sampling capability, and separate reference inputs for each channel. The part supports output update rates up to 105 Hz and includes on-chip functions such as switchable excitation current sources, low-side power switches, a temperature sensor, and a 4-bit digital I/O port.

Feature Summary

• Factory-calibrated architecture eliminates the need for field calibration.
• Simultaneous sampling and conversion of two signal sources without multiplexing delay.
• Integrated rail-rail input buffer and programmable gain amplifier for direct transducer interfacing.
• On-chip PLL generates internal frequencies from a 32 kHz crystal oscillator.

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 temperature range. Confirm that the component meets RoHS compliance requirements for the intended deployment environment. Ensure that the supply chain source provides valid traceability records for quality assurance purposes.

Selection Notes

Select this component for low-frequency measurement applications requiring high resolution and dual-channel synchronization. Consider the available packages, including SOIC and TSSOP options, based on board space constraints. Evaluate the power dissipation requirements when operating at 3 V versus 5 V supplies to ensure thermal management compatibility.

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 BRU variant specifically denotes the TSSOP-28 package option within the broader AD7719 product line, offering a compact form factor for surface-mount assembly.

Replacement Considerations

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

FAQ

What is the maximum output data rate for the AD7719?

The output data rate can be software programmed, with a maximum specified rate of 105 Hz.

Does the AD7719 require external calibration?

No, the device is factory-calibrated, meaning field calibration is not required for standard operation.

How does the AD7719 handle 50 Hz and 60 Hz noise rejection?

It achieves simultaneous 50 Hz and 60 Hz rejection at a 20 Hz update rate using its programmable digital filter characteristics.