**AD7400YRWZ-REEL: A High-Performance Isolated Sigma-Delta Modulator for Precision Current Sensing**

In the realm of power conversion and motor control systems, accurate and reliable current measurement is paramount for ensuring efficiency, safety, and performance. The **AD7400YRWZ-REEL** from Analog Devices stands as a critical component in this domain, offering a robust and highly integrated solution for precision current sensing in high-noise and high-voltage environments.

This device is a **second-order, isolated sigma-delta (Σ-Δ) modulator** that converts an analog input signal into a high-speed, single-bit data stream. Its core function is to sample the voltage developed across a shunt resistor through which the current to be measured flows. The modulator then transmits this digital data stream across a **high-voltage isolation barrier**—rated for up to 5 kV RMS for one minute—to a digital filter or a microcontroller on the isolated side. This architecture effectively breaks ground loops, suppresses common-mode noise, and protects sensitive low-voltage system components from damaging high-voltage transients.

The performance of the AD7400YRWZ-REEL is characterized by its exceptional accuracy. It achieves **16-bit resolution with no missing codes** and offers excellent linearity, typically ±0.001% of Full-Scale Range (FSR). A key advantage of the sigma-delta architecture is its inherent noise shaping, which pushes quantization noise out of the baseband, resulting in a high signal-to-noise ratio (SNR) and outstanding performance in the critical DC to ~100 kHz bandwidth typical for current control loops. The device operates from a single 5 V supply on its high-side and provides a 5 V or 3.3 V isolated supply output for powering external circuits, further simplifying system design.

Its applications are extensive and vital to modern industrial and renewable energy systems. It is ideally suited for:

* **Motor Phase Current Control** in industrial drives and robotics.

* **DC Link Current Sensing** in solar inverters and wind turbine converters.

* **Power Factor Correction (PFC) circuits**.

* **Overcurrent detection and protection** in automotive battery management systems (BMS).

Housed in a compact 16-lead SOIC_W package, the AD7400YRWZ-REEL provides a significantly smaller and more reliable alternative to traditional isolation methods based on optocouplers or Hall-effect sensors. Its integrated isolation and data conversion functionality streamline design, reduce component count, and enhance overall system reliability.

**ICGOODFIND**

The AD7400YRWZ-REEL is an indispensable solution for engineers designing high-voltage systems requiring precise and isolated current measurements. Its combination of **high accuracy, integrated isolation, and robust performance** makes it a preferred choice for advancing the efficiency and intelligence of power conversion and motor control applications across various industries.

**Keywords:** Isolated Sigma-Delta Modulator, Precision Current Sensing, High-Voltage Isolation, Motor Control, Analog-to-Digital Converter (ADC)