AD7718BRZ-REEL

Overview

The AD7718BRZ-REEL is a complete analog front-end for low frequency measurement applications, featuring a 24-bit Sigma-Delta ADC. It supports 4/5 fully-differential or 8/10 pseudo-differential input channels with a programmable gain amplifier ranging from 1 to 128. The device operates on a single 3 V or 5 V supply, consuming 3.84 mW at 3 V. It utilizes a 32 kHz crystal and internal PLL, offering software-programmable output data rates up to 1.365 kS/s. Factory calibration eliminates the need for field adjustments.

Feature Summary

• Factory-calibrated architecture ensuring high accuracy without requiring field calibration procedures.
• Integrated programmable gain front end capable of directly accepting low-level transducer signals.
• Simultaneous rejection capabilities for both 50 Hz and 60 Hz power line frequencies.
• Configurable VREF Select feature supporting both absolute and ratiometric measurement modes.

Applications

• Industrial process control systems
• Pressure transducers
• Portable instrumentation
• Smart transmitters

Procurement Notes

Verify the specific REEL suffix against the manufacturer's current ordering guide to confirm tape-and-reel packaging specifications. Confirm that the B grade temperature range meets the operational requirements. Ensure the external reference voltage falls within the specified 1 V to AVDD range for proper functionality.

Selection Notes

Select this component when 24-bit resolution and multiplexed channel capability are required for low-frequency signals. Compare against the AD7708 if 16-bit resolution suffices, as they share pin compatibility. Evaluate the CHOP mode settings based on whether optimizing for analog performance or channel throughput is the primary design goal.

Part Context

This part belongs to the AD7708/AD7718 family of low voltage, low power ADCs. It serves as the 24-bit counterpart to the 16-bit AD7708. Both devices share identical pinouts and functional blocks, allowing for direct hardware upgrades from 16-bit to 24-bit resolution without circuit modifications.

Replacement Considerations

The AD7718BRU is the TSSOP package equivalent. The AD7708 series offers 16-bit resolution with identical pinouts. Verify that any substitute maintains the 24-bit no-missing-codes specification and compatible SPI interface timing.