AD7714AR-3

Overview

The AD7714AR-3 is a complete analog front end for low-frequency measurement applications, featuring a 24-bit charge balancing ADC with no missing codes. It operates from a single +3 V supply and includes a five-channel programmable gain front end with gains ranging from 1 to 128. The device accepts low-level signals directly from transducers and outputs serial digital words via a three-wire interface compatible with SPI, QSPI, MICROWIRE, and DSP systems. It supports configuration as three fully differential or five pseudo-differential inputs.

Feature Summary

• Integrates a sigma-delta conversion technique with an on-chip digital filter that allows programmable cutoff frequencies and settling times.
• Provides self-calibration, system calibration, and background calibration options to eliminate endpoint errors and temperature drift effects.
• Features Schmitt triggers on the SCLK and DIN logic inputs to improve noise immunity in industrial environments.
• Supports read/write access to on-chip calibration registers for precise system tuning.

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 temperature range. Ensure the selected variant matches the required power supply voltage (3 V vs 5 V) and operating conditions before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring high-resolution signal conditioning with minimal external components. Consider the available gain settings and input configurations to match the sensor output characteristics. Verify compatibility with the host microcontroller's serial interface protocols and clock requirements.

Part Context

This part belongs to the AD7714 family of signal conditioning ADCs manufactured by Analog Devices Inc. The family includes variants optimized for different supply voltages and temperature ranges, such as the AD7714Y grade which offers extended temperature operation and lower power consumption.

Replacement Considerations

The AD7714ANZ-3 serves as a verified lead-free replacement option within the same product family, offering identical electrical specifications but in a PDIP package instead of SOIC.