SI8935B-ISR

ADCs/DACs - Special Purpose Overview

The Skyworks SI8935B-ISR is an automotive-grade, galvanically isolated delta-sigma modulator designed for voltage sensing applications. It features a single-ended analog input with a nominal range of 0 to 2.5 V and requires an external clock signal up to 25 MHz on the ACLK pin. The device provides a 1-bit digital output stream (ADAT) representing the input voltage, utilizing CMOS isolation technology to support withstand voltages up to 5000 VRMS per UL1577. Operating on a single supply between 3.0 V and 5.5 V, it delivers high accuracy with typical offset drift of ±0.5 µV/°C and gain drift of 9 ppm/°C. The component is housed in an 8-pin narrow body SOIC package.

ADCs/DACs - Special Purpose Feature Summary

• External clock input supporting frequencies up to 25 MHz
• High common-mode transient immunity of 75 kV/µs
• Automotive-grade qualification including AEC-Q100 and AIAG-compliant PPAP documentation
• Galvanic isolation rated up to 5000 VRMS for basic protection

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify that the specific ordering suffix corresponds to the narrow body SOIC package variant rather than the wide body stretched version. Confirm that the design includes provisions for an external clock source, as this model does not generate its own internal clock unlike the Si8936 or Si8937 counterparts. Ensure compliance with moisture sensitivity level requirements during assembly.

ADCs/DACs - Special Purpose Selection Notes

Select the SI8935B-ISR when system architecture requires synchronization between the modulator and the digital filter via a shared external clock source. This part is suitable for designs needing up to 25 MHz modulation frequency. For applications requiring integrated clock generation, consider the Si8936 (10 MHz) or Si8937 (20 MHz) variants instead.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Si8935/36/37 family of isolated delta-sigma modulators. While sharing similar electrical characteristics and isolation capabilities, the Si8935 is distinguished by its reliance on an external clock input. The 'B' designation indicates a 2.5 kVRMS insulation rating, though the datasheet notes up to 5000 VRMS for the series generally.

ADCs/DACs - Special Purpose Replacement Considerations

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