AD7799BRU

Overview

The AD7799BRU is a low power, low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit Σ-Δ ADC with three differential analog inputs and an on-chip low noise instrumentation amplifier. The device operates with a power supply from 2.7 V to 5.25 V and consumes 380 µA typical current. Key specifications include 27 nV RMS noise at 4.17 Hz update rate with gain of 64, simultaneous 50 Hz/60 Hz rejection, and an internal clock oscillator. It features a low-side power switch, reference detect, programmable digital outputs, burnout currents, and supports 3-wire serial, SPI, QSPI, MICROWIRE, and DSP compatible interfaces.

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 features such as a low-side power switch, reference voltage detection, programmable digital output pins, and burnout currents.
• Supports multiple digital interface protocols including 3-wire serial, SPI, QSPI, Microwire, and DSP compatibility.

Applications

• Weigh scales
• Pressure measurement
• Strain gauge transducers
• Gas analysis
• Industrial process control

Procurement Notes

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

Selection Notes

Select this component for applications requiring high precision and low noise in a compact form factor. Consider the available gain settings and update rates to balance resolution and speed requirements. Verify that the external reference voltage and supply voltages align with the device's operational limits.

Part Context

The AD7799BRU belongs to the AD779x series of analog-to-digital converters from Analog Devices. This series includes variants like the AD7798 (16-bit) and AD7799 (24-bit), designed for low-power, high-precision measurements. The BRU suffix typically denotes a specific package configuration within the TSSOP family.

Replacement Considerations

The AD7798 is a pin-compatible alternative offering 16-bit resolution with lower power consumption. Other members of the AD779x family may offer different channel counts or resolutions but require verification of electrical parameters and pin configurations.