AD7791BRMZ-REEL

Overview

The AD7791BRMZ-REEL is a low-power, buffered 24-bit Sigma-Delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.5 V to 5.25 V and features an internal clock oscillator, eliminating the need for external timing components. The device provides one differential input channel with software-selectable gain and supports both buffered and unbuffered modes. It communicates via a 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Key electrical specifications include a maximum power supply current of 75 μA in normal mode and 1 μA in power-down mode. The integral nonlinearity is typically 3.5 ppm, with an RMS noise of 1.1 μV at a 9.5 Hz update rate.

Feature Summary

• Integrated rail-to-rail input buffer allows connection of high source impedances without introducing gain errors.
• Internal clock oscillator simplifies system design by removing the requirement for external crystal or clock sources.
• Software-programmable output data rates enable simultaneous rejection of 50 Hz and 60 Hz line frequencies.
• Low power consumption is achieved through multiple operating modes, including continuous conversion, single conversion, and power-down states.

Applications

• Smart transmitters
• Battery-powered portable instrumentation
• Precision sensor measurement systems
• Industrial temperature and pressure measurement
• Weigh scales and load cell interfaces

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to confirm package type and reel specifications. Ensure compatibility with the target board's voltage levels and serial interface timing requirements before integration. Cross-reference the component revision with the intended application's performance constraints.

Selection Notes

Select this component for applications requiring high resolution with minimal power draw. Consider the buffered input configuration if driving signals originate from high-impedance sensors. Evaluate the available update rates to balance noise performance against system speed requirements. Confirm that the MSOP-10 package fits the physical layout constraints of the design.

Part Context

This part belongs to the AD779x family of low-power Sigma-Delta ADCs from Analog Devices. It shares architectural similarities with the AD7790 but offers higher 24-bit resolution compared to the 16-bit variant. The device is designed for precision measurement tasks where low frequency signals are processed with high accuracy.

Replacement Considerations

The AD7790BRMZ is a related 16-bit version within the same family. Verify pinout compatibility and register mapping differences when substituting parts. Ensure the replacement meets the required resolution and power specifications for the specific application.