ISOSD61LTR

ADCs/DACs - Special Purpose Overview

The ISOSD61LTR is a galvanically isolated second-order Sigma-Delta modulator from STMicroelectronics, housed in a 16-SO wide package. It converts analog signals within a ±320 mV range into a high-speed 1-bit digital data stream at up to 25 Msps using embedded transformer coupling. The device provides 16-bit resolution with no missing codes when paired with a digital filter. Key electrical parameters include an 86 dB typical SNR, -83 dB THD, and 13-bit ENOB. It operates on single supplies (VDD: 3–5.5 V; VDDISO: 4.5–5.5 V) across an industrial temperature range of –40°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Galvanic isolation via embedded transformer coupling with 5000 VPEAK VIOTM and 1700 VPEAK VIORM.
• High common-mode transient immunity of 30 kV/µs typical.
• LVDS digital interface for low-voltage differential signaling.
• 16-bit resolution with no missing codes and 86 dB typical SNR.

ADCs/DACs - Special Purpose Applications

• Industrial motor control current and voltage sensing
• Solar inverter monitoring
• Uninterruptible Power Supply (UPS)
• Electric vehicle chargers
• Telecom and server power supplies

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix 'LTR' corresponds to the Tape and Reel packing format as defined in the manufacturer's ordering information table. Confirm that the LVDS interface variant matches system requirements, distinct from the TTL/CMOS option. Ensure compliance with RoHS3 standards and check MSL level 3 handling precautions during assembly.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring high accuracy and robust isolation in noisy environments. The LVDS interface is suitable for high-speed digital communication. Designers must implement external digital filtering, such as a SINC3 filter, to reconstruct the 16-bit signal from the 1-bit modulator output. Ensure supply voltages meet the recommended operating conditions for both low and high sides.

ADCs/DACs - Special Purpose Part Context

The ISOSD61LTR belongs to the ISOSD61 family of isolated ADCs. The 'L' suffix denotes the Low Voltage Differential Signaling (LVDS) interface variant, while 'TR' indicates tape and reel packaging. This family utilizes embedded transformer technology to achieve superior performance compared to traditional optocouplers, offering higher speed and reliability for industrial sensing applications.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official STMicroelectronics resources or authorized distributors for cross-reference recommendations based on specific isolation and performance requirements.