ACPL-7970-500E

Overview

The ACPL-7970-500E is a miniature optically isolated sigma-delta modulator manufactured by Broadcom Limited. It functions as a 1-bit, second-order modulator that converts analog input signals into high-speed data streams with galvanic isolation. The device operates from a single 5V power supply and provides a dynamic range of 78dB when used with an appropriate digital filter. This component integrates optical isolation technology to ensure signal integrity across potential ground differences in sensitive measurement environments.

Feature Summary

• Integrates second-order sigma-delta modulation for high-resolution analog-to-digital conversion
• Provides galvanic isolation between the analog input and digital output stages
• Operates on a single 5V power supply rail for simplified circuit design
• Delivers a dynamic range of 78dB suitable for precision data acquisition applications

Applications

• High-precision industrial data acquisition systems requiring electrical isolation
• Medical instrumentation where patient safety and signal integrity are critical
• Process control loops involving noisy electrical environments
• Scientific measurement equipment demanding low-noise analog front ends

Procurement Notes

Verify the specific suffix '500E' corresponds to the required tape and reel packaging configuration. Confirm that the operating temperature range aligns with the intended environmental conditions. Ensure compatibility with the host system's digital filtering requirements to achieve the specified 78dB dynamic range. Check for any RoHS compliance documentation if restricted substances are a concern for the final assembly.

Selection Notes

Select this component when a compact solution combining isolation and high-resolution modulation is required. Consider the 78dB dynamic range limit against the noise floor of the application. Evaluate the need for external digital filters to fully realize the modulator's performance capabilities. Compare pinout and package dimensions against existing board layouts to ensure mechanical fit without redesigning the footprint.

Part Context

This part belongs to Broadcom's family of optically isolated sigma-delta modulators. These devices are designed to replace traditional isolation amplifiers by providing digital outputs directly from the isolated side. The series supports various sampling rates and resolutions depending on the specific model variant and the digital filter applied downstream.

Replacement Considerations

Direct replacements include other models within the ACPL-797x series or HCPL-7900 series, provided they match the 5V supply and isolation voltage requirements. Verify that substitute parts offer equivalent dynamic range and modulation order to maintain system accuracy.