**High-Performance Signal Isolation in Industrial Systems with the ADuM7702-8BRIZ-RL7 Sigma-Delta Modulator**

In the demanding environment of industrial automation, motor control, and power management, the accurate and reliable measurement of critical system parameters is paramount. Voltages and currents must be monitored with high precision, yet the sensors responsible for these measurements often operate in a different electrical domain from the system's central processing unit. **High-voltage transients, ground potential differences, and electrical noise** pose significant threats to both measurement integrity and equipment safety. **Signal isolation** is, therefore, not a luxury but a fundamental requirement for robust system design.

The **ADuM7702-8BRIZ-RL7**, a high-performance, 2nd-order, sigma-delta (Σ-Δ) modulator from Analog Devices, represents a significant advancement in solving these isolation challenges. This component is engineered to deliver **high-accuracy, isolated sampling** of AC and DC signals, making it an ideal choice for a wide array of industrial applications.

**Architecture of Excellence: How the ADuM7702-8BRIZ-RL7 Works**

The device's operation is elegantly powerful. On its input side, a proprietary **iCoupler® technology** from Analog Devices is employed. The analog input voltage is sampled by a high-performance Σ-Δ modulator. This modulator converts the analog signal into a high-speed, single-bit data stream. This digital stream is then transmitted across a silicon dioxide-based isolation barrier that provides **reinforced isolation of up to 7.8 kV peak**. This barrier is certified to meet stringent international safety standards, including UL, CSA, and VDE, ensuring robust protection for both equipment and operators.

On the isolated output side of the barrier, the received data stream is processed by a digital filter (typically external to the modulator, such as in an FPGA or microcontroller) to reconstruct the high-resolution digital representation of the original analog input. This architecture yields a **20-bit resolution output** with excellent linearity and low offset, enabling highly precise measurements.

**Key Advantages for Industrial Deployments**

The ADuM7702-8BRIZ-RL7 offers several compelling benefits that make it stand out:

* **High Noise Immunity:** The digital nature of the signal crossing the isolation barrier makes the system inherently immune to the common-mode noise and transient interference prevalent in industrial settings.

* **Simplified Design:** By integrating the isolation and modulation functions into a single, small-outline IC (SOIC) package, it significantly reduces design complexity and board space compared to discrete optocoupler-based or transformer-based solutions.

* **Superior Performance:** It achieves outstanding specifications, including **92 dB typical signal-to-noise ratio (SNR)** and a nominal -105 dB total harmonic distortion (THD), which are critical for accurate power quality analysis and high-efficiency motor control.

* **High CMTI:** The device features a high Common-Mode Transient Immunity (CMTI) of >100 kV/µs. This ensures that the output remains stable and error-free even during extremely fast shifts in ground potential, a common occurrence in power switching systems.

**Application Spotlight**

This modulator is exceptionally well-suited for:

* **Industrial Motor Drives:** Providing isolated current and voltage feedback from the high-power inverter stage to the control processor.

* **Solar Inverters and UPS Systems:** Isolating DC-link voltage measurement and AC output current sensing.

* **PLC Analog Input Modules:** Enabling safe and accurate measurement of field sensor signals that may be riding on high common-mode voltages.

* **Protection Relays:** Offering the precision and speed required for fast overcurrent and overvoltage detection.

**ICGOODFIND**

The **ADuM7702-8BRIZ-RL7** is a critical enabler for next-generation industrial systems, **masterfully combining high-resolution data conversion with robust galvanic isolation**. Its integration, performance, and reliability simplify design challenges and provide a future-proof solution for applications where precision and safety cannot be compromised.

**Keywords:** Signal Isolation, Sigma-Delta Modulator, Industrial Systems, iCoupler Technology, High CMTI