AD7794BRUZ-REEL: A 24-Bit Sigma-Delta ADC for Low-Frequency Precision Measurement Applications

Release date:2025-09-15 Number of clicks:133

**AD7794BRUZ-REEL: A 24-Bit Sigma-Delta ADC for Low-Frequency Precision Measurement Applications**

In the realm of precision electronics, the accurate digitization of low-frequency analog signals presents a unique set of challenges. Parameters like temperature, pressure, strain, and weight change slowly but demand exceptional resolution and noise-free measurement. The **AD7794BRUZ-REEL** from Analog Devices stands as a premier solution, a highly integrated, low-power, **24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC)** engineered specifically for these demanding low-frequency applications.

At the core of the AD7794's performance is its **advanced sigma-delta architecture**. This technique oversamples the input signal and uses noise shaping to push quantization noise out of the baseband frequencies of interest. The result is exceptionally high effective resolution and accuracy within the DC to approximately 100 Hz range, making it ideal for direct connection to precision bridge sensors like strain gauges and RTDs without requiring extensive external signal conditioning.

A key feature of the AD7794 is its unparalleled level of integration. The device incorporates not only the ADC but also a **low-noise, programmable instrumentation amplifier (PGA)** at its front-end. This allows it to directly interface with very low-level signals from sensors, amplifying them to the optimal range for conversion. Furthermore, it includes an on-chip **precision low-drift reference** and clock oscillator, eliminating the need for these external components and thereby reducing both system design complexity and board space. The device operates from a single power supply (2.7 V to 5.25 V) and consumes a mere 400 µA, making it suitable for portable and battery-powered instruments.

The AD7794 offers three differential analog inputs and provides a flexible serial interface for communication with a microcontroller or DSP. Its internal programmable gain amplifier (with gains from 1 to 128) and output data rate settings allow designers to fine-tune the trade-off between resolution, speed, and power consumption for their specific application. This programmability ensures that the ADC can be adapted to a wide array of precision measurement scenarios, from industrial process control to medical diagnostics and scientific equipment.

**ICGOODFIND:** The AD7794BRUZ-REEL is an exemplary IC that **masterfully balances ultra-high precision, high integration, and low power consumption**. It removes significant design barriers for engineers developing high-accuracy measurement systems, providing a complete, all-in-one data acquisition solution that maximizes performance while minimizing external component count and power budget.

**Keywords:** **24-Bit ADC**, **Sigma-Delta**, **Low-Frequency Measurement**, **Low-Power**, **Instrumentation Amplifier**

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