SI8937B-AS

ADCs/DACs - Special Purpose Overview

The Skyworks SI8937B-AS is an automotive-grade, galvanically isolated delta-sigma modulator optimized for voltage sensing. It features a single-ended input range of 0 to 2.5 V and integrates a 20 MHz internal oscillator. The device provides high accuracy with typical offset drift of ±0.5 µV/°C and gain drift of 9 ppm/°C. It utilizes CMOS isolation technology supporting up to 2500 VRMS withstand voltage per UL1577 for the narrow body SOIC package. The output is a 1-bit digital stream processed by external filters.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 20 MHz internal clock for simplified system design
• High common-mode transient immunity (CMTI) of 75 kV/µs
• Automotive qualification via AEC-Q100 standards
• Low power consumption with fail-safe modes during supply loss

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific insulation rating suffix 'B' corresponds to the required 2.5 kVRMS isolation level for the application. Confirm the narrow body SOIC package dimensions match the PCB land pattern requirements. Ensure the manufacturing date code aligns with moisture sensitivity handling guidelines before soldering.

ADCs/DACs - Special Purpose Selection Notes

Select this model when an internal 20 MHz clock is preferred over external clocking or lower frequency options. The 'B' suffix indicates 2.5 kVRMS isolation, suitable for applications where 5.0 kVRMS is not strictly required. Verify that the single-ended input architecture fits the sensor interface constraints compared to differential alternatives.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Si893x family of isolated delta-sigma modulators. It shares architectural similarities with the Si8935 (external clock) and Si8936 (10 MHz internal clock). The 'B' variant specifically denotes the 2.5 kVRMS insulation rating, distinguishing it from the 'D' series which offers 5.0 kVRMS isolation.

ADCs/DACs - Special Purpose Replacement Considerations

The SI8937B-ASR is the reel-pack equivalent of the tube-packed SI8937B-AS. For higher isolation requirements, consider the SI8937D-IS4 series. Lower frequency needs may be met by the SI8936 series.