ISOSD61TR

ADCs/DACs - Special Purpose Overview

The ISOSD61TR is a galvanically isolated second-order Sigma-Delta modulator from STMicroelectronics, housed in an SO-16 wide package. It converts analog signals within a ±320 mV range into a 25 Msps, 1-bit digital stream using embedded transformer coupling technology. The device offers 16-bit resolution with no missing codes and achieves a typical SNR of 86 dB. It supports LVDS or single-ended TTL/CMOS interfaces and operates across an extended industrial temperature range of -40°C to +125°C. Key isolation specifications include a 5000 VPEAK isolation voltage (VIOTM) and 30 kV/µs common-mode transient immunity.

ADCs/DACs - Special Purpose Feature Summary

• Galvanic isolation via embedded transformer coupling with 5000 VPEAK VIOTM and 30 kV/µs CMTI
• 16-bit resolution with no missing codes, 86 dB typical SNR, and 13-bit typical ENOB
• Supports up to 25 MHz external clock input for high-speed data conversion
• Available with LVDS or Single-ended (TTL/CMOS) digital output options

ADCs/DACs - Special Purpose Applications

• Current or voltage sensing in industrial motor control
• Solar inverters
• Uninterruptible Power Supplies (UPS)
• Electric vehicle chargers
• Telecom and server power supplies

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific interface variant required for the design, as the base model ISOSD61 denotes single-ended TTL/CMOS outputs while ISOSD61L denotes LVDS outputs. Confirm that the TR suffix corresponds to the Tape and Reel packing format specified in the ordering information table. Ensure compliance with IEC 60747-17 and UL 1577 safety standards if regulatory approval is mandated for the final application.

ADCs/DACs - Special Purpose Selection Notes

Select the ISOSD61TR when a single-ended digital interface is sufficient for the system architecture. If differential signaling noise immunity is critical, consider the ISOSD61LTR variant instead. Designers must implement external digital filtering, such as a SINC3 filter, to reconstruct the 16-bit data from the 1-bit modulator stream. Ensure supply decoupling capacitors are placed close to both VDD and VDDISO pins to maintain signal integrity.

ADCs/DACs - Special Purpose Part Context

The ISOSD61TR belongs to the ISOSD61 family of isolated Sigma-Delta ADCs. It shares core performance metrics with the tray-packaged ISOSD61 but differs in shipping configuration. The family utilizes high-speed isolated data coupling to outperform traditional optocouplers in transient immunity. Evaluation boards like EVALST-ISOSD61T are available to assist in prototyping and verifying the converter's features in target applications.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.