AD7714ARZ-3REEL

Overview

The AD7714ARZ-3REEL is a 24-bit sigma-delta analog-to-digital converter (ADC) from Analog Devices, designed for low-frequency signal conditioning. It features a five-channel programmable gain front end with gains ranging from 1 to 128, configurable as three fully differential or five pseudo-differential inputs. The device operates on a single +3 V supply and includes an internal reference of +1.25 V. It utilizes a charge balancing architecture with a digital filter offering programmable notch frequencies. The component is housed in a 24-lead SOIC package and supports a three-wire serial interface compatible with SPI, QSPI, Microwire, and DSP systems.

Feature Summary

• Integrates a complete analog front end with a programmable gain amplifier and sigma-delta modulator for direct transducer interfacing.
• Provides self-calibration and system calibration capabilities to eliminate zero-scale and full-scale errors.
• Features a digital filter with programmable cutoff frequencies to adjust settling time and reject specific noise frequencies.
• Supports flexible input configurations including fully differential and pseudo-differential modes via software control.

Applications

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

Procurement Notes

Verify the exact part number against official manufacturer documentation to confirm the REEL suffix indicates tape-and-reel packaging. Ensure the -3 designation matches the required +3 V operating voltage range. Confirm RoHS compliance status and lead-free specifications through current datasheets before procurement.

Selection Notes

Select this component when a 24-bit resolution with low power consumption is required for 3 V systems. Consider the AD7714Y grade if operation down to 2.7 V or extended temperature ranges up to +105°C are necessary. Verify that the SOIC package fits the board layout constraints compared to DIP or TSSOP alternatives.

Part Context

This part belongs to the AD7714 family of signal conditioning ADCs. Variants include the AD7714-5 for 5 V operation and the AD7714Y grade for enhanced linearity and lower power. The ARZ suffix denotes the SOIC package with RoHS compliance, while REEL specifies the bulk tape packaging format for automated assembly.

Replacement Considerations

The AD7714AR-3 is the non-RoHS equivalent in the same SOIC package. For 5 V applications, the AD7714ARZ-5 serves as the functional counterpart. The AD7714YRUZ offers the same functionality in a TSSOP package with extended temperature and voltage range capabilities.

FAQ

What is the maximum integral nonlinearity error for the AD7714?

The integral nonlinearity is specified as a maximum of 0.0015% of FSR for filter notches at or below 60 Hz.

Can the AD7714 operate with an external master clock?

Yes, the device accepts an external master clock input on the MCLK IN pin, with a frequency range from 400 kHz to 2.5 MHz.

How many channels can be configured as fully differential inputs?

The device can be configured as three fully differential inputs or five pseudo-differential inputs using its switching matrix.