SI8937D-AS4

ADCs/DACs - Special Purpose Overview

The SI8937D-AS4 is a galvanically isolated delta-sigma modulator optimized for voltage sensing, manufactured by Skyworks Solutions. It features a single-ended input range of 0 to 2.5 V and utilizes an internal 20 MHz oscillator for clocking. The device provides high common-mode transient immunity (CMTI) of up to 75 kV/µs, ensuring accurate measurements in noisy environments like motor drives. It supports up to 5.0 kVRMS isolation per UL1577 and operates within a temperature range of -40 °C to +125 °C. The output is a 1-bit digital stream processed by external filters.

ADCs/DACs - Special Purpose Feature Summary

• Internal 20 MHz DSM clock generation
• High CMTI of 75 kV/µs typical
• 5.0 kVRMS isolation rating (UL1577)
• Wide body SSOP-8 package

ADCs/DACs - Special Purpose Applications

• Industrial inverters
• HEV and renewable energy systems
• Motor controls and drives
• Automotive battery management systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix AS4 corresponds to the Wide Body SSOP-8 packaging configuration as defined in the datasheet ordering information. Confirm that the D suffix indicates the 5.0 kVRMS insulation rating. Ensure compliance with Moisture Sensitivity Level 2A requirements during storage and assembly processes.

ADCs/DACs - Special Purpose Selection Notes

Select the SI8937D-AS4 when an internal clock source is preferred over external clocking to simplify PCB layout. This model is suitable for applications requiring high accuracy with low offset drift (±0.5 µV/°C). Verify that the system controller can process the 1-bit delta-sigma output stream at the specified 20 MHz frequency.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Si893x family of isolated delta-sigma modulators. The Si8937 variant specifically integrates a 20 MHz internal clock, distinguishing it from the Si8935 (external clock) and Si8936 (10 MHz internal clock). The 'D' designation confirms the higher 5.0 kVRMS insulation capability compared to lower-rated variants.

ADCs/DACs - Special Purpose Replacement Considerations

Direct functional replacements include the SI8936D-AS4 (10 MHz internal clock) or SI8935D-AS4 (external clock), provided the clock interface is adapted. For automotive-grade requirements, verify AEC-Q100 qualified equivalents such as the SI8937B series if PPAP documentation is required.