AD7718BRZ

Overview

The AD7718BRZ is a complete analog front-end for low-frequency measurement applications, featuring a 24-bit Sigma-Delta ADC with an integrated programmable gain amplifier. It supports 4/5 fully-differential or 8/10 pseudo-differential input channels and operates from a single 3 V or 5 V supply. The device utilizes a 32 kHz crystal oscillator with an on-chip PLL to generate internal frequencies, allowing software-programmable output data rates up to 1.365 kS/s. Key electrical parameters include ±10 ppm maximum integral nonlinearity, ±0.003% FSR negative full-scale error, and simultaneous 50 Hz and 60 Hz rejection capabilities.

Feature Summary

• Factory-calibrated architecture ensuring high precision without external calibration components
• VREF Select capability enabling both absolute and ratiometric measurement configurations
• Configurable CHOP mode to optimize performance for either analog accuracy or channel throughput
• Integrated rail-to-rail input buffer and programmable gain amplifier for direct transducer interfacing

Applications

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

Procurement Notes

Verify the specific ordering suffix to confirm package type, as the BRZ designation corresponds to the SOIC-28 package. Confirm that the component meets RoHS compliance standards required for your assembly process. Check current availability status as manufacturing lifecycles may affect long-term sourcing options.

Selection Notes

Select this component when high-resolution 24-bit conversion is required for low-frequency signals. Ensure the application can accommodate the external 32 kHz crystal oscillator requirement. Verify that the available reference voltage range between 1 V and AVDD aligns with system design constraints.

Part Context

The AD7718BRZ belongs to the AD7708/AD7718 family of low-voltage, low-power ADCs. It serves as the 24-bit resolution counterpart to the 16-bit AD7708. Both devices share pin-for-pin compatibility, providing a scalable path for upgrading resolution in existing designs without hardware modifications.

Replacement Considerations

The AD7708BRZ is a compatible lower-resolution alternative within the same family. Designers requiring 16-bit resolution can substitute the AD7718BRZ with the AD7708BRZ while maintaining identical pinouts and interface requirements.