AD7714ARS-3

Overview

The AD7714ARS-3 is a complete analog front end for low-frequency measurement applications, manufactured by Analog Devices Inc. It employs a sigma-delta conversion technique to realize up to 24 bits of no missing codes performance. The device features five-channel programmable gain front ends with gains from 1 to 128 and accepts low-level signals directly from transducers. It operates from a single +3 V supply (AVDD) and includes a three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP systems. The component is housed in a 28-lead shrink small outline package (SSOP).

Feature Summary

• Integrates a charge balancing ADC with a proprietary programmable gain front end based on an analog modulator.
• Features a digital filter with programmable cutoff frequencies and notch settings for noise rejection.
• Supports self-calibration, system calibration, and background calibration modes via on-chip registers.
• Provides a flexible serial interface configurable for three-wire operation to minimize interconnect lines.

Applications

• Portable industrial instruments
• Portable weigh scales
• Loop-powered systems
• Pressure transducers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and voltage rating. Ensure compatibility with existing board layouts regarding the SSOP footprint. Confirm that the required operating temperature range aligns with the specified -40°C to +85°C limits for this variant.

Selection Notes

Select this model when a fixed 3 V analog supply is available and a compact surface-mount package is required. Consider alternative variants if a wider industrial temperature range or 5 V operation is necessary. Evaluate the need for multiple differential inputs versus pseudo-differential configurations to optimize channel usage.

Part Context

This component belongs to the AD7714 family of signal conditioning ADCs designed for high-precision measurements. The 'ARS' designation specifically identifies the 28-lead SSOP package option within the standard A version product line. Other members of this series include DIP and SOIC package variations tailored for different manufacturing requirements.

Replacement Considerations

Direct replacements within the same family include the AD7714AN-3 (DIP-24) and AD7714AR-3 (SOIC-24), which share identical electrical specifications but differ in physical package dimensions. Verify pinout compatibility before substituting these alternatives.