AD7799BRUZ-REEL

Overview

The AD7799BRUZ-REEL is a low-power, low-noise analog front end featuring a 24-bit Sigma-Delta ADC with three differential inputs. It integrates a programmable gain instrumentation amplifier (1 to 128), an internal clock oscillator, and reference detection. The device operates on a 2.7 V to 5.25 V supply, consuming 380 µA typical current. It supports update rates from 4.17 Hz to 470 Hz and includes features such as a low-side power switch, burnout currents, and simultaneous 50/60 Hz rejection.

Feature Summary

• Integrates a 24-bit Sigma-Delta ADC with three differential analog inputs and a low-noise programmable gain instrumentation amplifier.
• Includes on-chip functionality such as an internal clock oscillator, reference detect, low-side power switch, and burnout currents.
• Supports multiple serial interface protocols including SPI, QSPI, Microwire, and DSP via a Schmitt-triggered SCLK input.

Applications

• Weigh scales
• Pressure measurement
• Strain gauge transducers
• Industrial process control
• Portable instrumentation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and reel specifications. Ensure that the component matches the required temperature range and voltage ratings for the intended application environment before finalizing procurement.

Selection Notes

Select this component for applications requiring high-resolution data acquisition from low-level sensors. Consider the integrated PGA to eliminate external amplification stages. Verify that the system power budget accommodates the typical 380 µA operating current and that the serial interface timing aligns with the host microcontroller capabilities.

Part Context

This part belongs to the AD7798/AD7799 family of complete analog front ends designed for precision measurement. The AD7799 variant specifically provides 24-bit resolution compared to the 16-bit AD7798. Both share identical pinouts and functional blocks, differing primarily in ADC resolution and noise performance characteristics.

Replacement Considerations

The AD7798 serves as a lower-resolution alternative within the same package and feature set. Cross-referencing should focus on verifying if the 16-bit resolution of the AD7798 meets the system requirements, as both devices share the same pin configuration and software compatibility.

FAQ

What is the maximum integral nonlinearity specified for the AD7799?

The maximum integral nonlinearity is specified as ±15 ppm of full-scale range.

How does the device handle 50 Hz and 60 Hz interference?

The device offers simultaneous 50 Hz and 60 Hz rejection capabilities through its software-programmable output data rates.

Can the digital interface operate at a different voltage than the analog supply?

Yes, the DVDD supply for the digital interface is independent of the AVDD analog supply, allowing for level shifting between 2.7 V and 5.25 V ranges.