AD7714AR-5

Overview

The AD7714AR-5 is a complete analog front end for low-frequency measurement applications, featuring a charge balancing ADC with 24-bit resolution and no missing codes. It operates from a single +5 V supply (AVDD: +4.75 V to +5.25 V; DVDD: +3 V to +5.25 V) and consumes typically 500 μA in normal mode. The device includes a five-channel programmable gain front end with gains from 1 to 128, configurable as three fully differential or five pseudo-differential inputs. It utilizes sigma-delta conversion and features an on-chip digital filter with programmable cutoff frequencies. The part is housed in a 24-lead SOIC package and supports SPI, QSPI, Microwire, and DSP-compatible serial interfaces.

Feature Summary

• Integrates a five-channel programmable gain front end with gains ranging from 1 to 128.
• Features a sigma-delta architecture providing 24-bit performance without missing codes.
• Includes an on-chip digital filter with programmable notch frequencies for noise rejection.
• Supports self-calibration, system calibration, and background calibration modes.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'R' corresponds to the 24-lead Small Outline (SOIC) package configuration. Confirm that the '-5' designation aligns with the required +5 V analog supply voltage range of +4.75 V to +5.25 V. Ensure the operating temperature range of -40°C to +85°C meets the environmental requirements of the target application before finalizing procurement.

Selection Notes

Select this component when a single-supply 5 V operation is required alongside high-resolution signal conditioning. The AD7714AR-5 is suitable for systems needing up to five input channels with programmable gain. Consider the Y-grade variants if a wider temperature range (-40°C to +105°C) or lower power consumption is necessary. Verify compatibility with the host microcontroller's serial interface protocols.

Part Context

The AD7714 series serves as a comprehensive analog front end designed for precision low-frequency measurements. The AR-5 variant specifically targets 5 V powered environments, offering a balance of high resolution and low power dissipation. It eliminates external signal conditioning components by integrating amplification and filtering directly into the ADC structure.

Replacement Considerations

The AD7714YR-5 offers a wider operating temperature range (-40°C to +105°C) and improved linearity specifications while maintaining the same pinout and functionality. The AD7714AN-5 provides a plastic DIP package alternative for through-hole mounting requirements.