SI8935D-IS4R

ADCs/DACs - Special Purpose Overview

The SI8935D-IS4R is a galvanically isolated delta-sigma modulator designed for voltage sensing applications. It features a single channel with a nominal input range of 0 to 2.5 V and accepts an external clock signal up to 25 MHz on the ACLK pin. The device provides a 1-bit digital output stream representing the analog input voltage, transmitted across a CMOS isolation barrier rated for 5 kVRMS withstand voltage. Operating on a single supply between 3.0 V and 5.5 V, it draws typical currents of 7 mA on the input side and 2.7 mA on the output side at 3.3 V. Key performance metrics include a typical input offset of ±0.4 mV, gain error of ±0.05%, and common-mode transient immunity of 75 kV/µs.

ADCs/DACs - Special Purpose Feature Summary

• External clock input supporting frequencies from 5 MHz to 25 MHz
• High common-mode transient immunity of 75 kV/µs
• Galvanic isolation rated up to 5000 VRMS per UL 1577
• Typical input offset voltage of ±0.4 mV with low drift

ADCs/DACs - Special Purpose Applications

• Industrial, HEV and renewable energy inverters
• AC, brushless, and DC motor controls and drives
• Isolated switch mode and UPS power supplies
• Automotive on-board chargers and battery management systems

ADCs/DACs - Special Purpose Procurement Notes

Verify that the IS4 suffix corresponds to the Wide Body Stretched SOIC-8 package and 5.0 kVRMS insulation rating as specified in the datasheet. Confirm the 'R' suffix indicates tape and reel packaging rather than tube packaging. Ensure the external clock source meets the 5–25 MHz frequency range and logic threshold requirements defined for the Si8935 variant.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an external clock is required for synchronization with a system controller or FPGA. The Si8935 differs from the Si8936 and Si8937 by utilizing an external clock input instead of an internal oscillator. Verify that the application requires the 5.0 kVRMS isolation level provided by the 'D' suffix, as other variants offer lower ratings.

ADCs/DACs - Special Purpose Part Context

The SI8935D-IS4R belongs to the Si8935/36/37 family of isolated delta-sigma modulators. While the Si8936 and Si8937 feature internal clocks of 10 MHz and 20 MHz respectively, the Si8935 is specifically designed for external clocking. This allows the modulator clock to be synchronized directly with the digital filter in the receiving system, ensuring coherent data processing.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.