SI8936B-ASR

ADCs/DACs - Special Purpose Overview

The Skyworks SI8936B-ASR 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 10 MHz internal DSM clock. The device provides high accuracy with typical offset drift of ±0.5 µV/°C and gain drift of 9 ppm/°C. It supports up to 5.0 kVRMS isolation per UL 1577 and operates within a temperature range of –40 °C to +125 °C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 10 MHz internal delta-sigma modulator clock
• High common-mode transient immunity of 75 kV/µs
• Automotive-grade qualification (AEC-Q100) with PPAP support
• Typical signal-to-noise ratio of 86 dB

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'ASR' against the manufacturer's current documentation to confirm package type and reel specifications. Ensure compliance with moisture sensitivity level requirements during storage and soldering assembly processes.

ADCs/DACs - Special Purpose Selection Notes

Select the SI8936B-ASR when an internal 10 MHz clock is required for the delta-sigma modulator. This model is suitable for applications needing automotive certification and high CMTI in noisy environments like motor drives or inverters.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Si8935/36/37 family of isolated delta-sigma modulators. The '36' designation indicates the inclusion of an internal 10 MHz oscillator, distinguishing it from the externally clocked Si8935 and the 20 MHz internal clock Si8937 variants.

ADCs/DACs - Special Purpose Replacement Considerations

Direct functional substitutes within the same family include the SI8935B-ASR (external clock) and SI8937B-ASR (20 MHz internal clock). Verify insulation ratings and clock frequency requirements before substitution.

ADCs/DACs - Special Purpose FAQ

What is the fail-safe output state if the VDDA supply is lost?

In the event of a VDDA loss, the Si8936 outputs a steady-state logic 1 on the ADAT pin.

How does the input impedance affect performance?

The device has a high input impedance of 500 MΩ. For optimal performance, source resistance should be considered when designing input filtering RC networks.

What is the maximum withstand isolation voltage?

The device is rated for up to 5000 VRMS isolation voltage for basic protection under UL 1577 standards.