SI8937B-ISR

ADCs/DACs - Special Purpose Overview

The SI8937B-ISR is a galvanically isolated delta-sigma modulator designed for voltage sensing applications. It features an internal 20 MHz oscillator and accepts a single-ended analog input within a 0 to 2.5 V range. The device provides high accuracy with typical offset of ±0.4 mV, gain error of ±0.05%, and SNR of 86 dB. It supports up to 5.0 kVRMS isolation per UL1577 and operates on supply voltages between 3.0 V and 5.5 V. Automotive-grade versions are AEC-Q100 qualified.

ADCs/DACs - Special Purpose Feature Summary

• Internal 20 MHz clock generator
• Single-ended 0 to 2.5 V input range
• High common-mode transient immunity (75 kV/µs)
• AEC-Q100 automotive qualification

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific insulation rating associated with the 'B' suffix against the datasheet table for safety certifications. Confirm package type matches the required PCB land pattern. Check moisture sensitivity level requirements for assembly processes. Ensure supply voltage ranges align with system design constraints.

ADCs/DACs - Special Purpose Selection Notes

Select this model when an internal clock source is preferred over external clocking to simplify board layout. The 20 MHz internal frequency offers higher bandwidth compared to the Si8936's 10 MHz option. Verify that the single-ended input architecture fits the sensor interface requirements rather than differential configurations.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Si893x family of isolated delta-sigma modulators. It shares the same physical package and pinout with the Si8935 (external clock) and Si8936 (10 MHz internal clock). The primary distinction lies in the clock generation method and resulting performance characteristics.

ADCs/DACs - Special Purpose Replacement Considerations

Si8936B-ISR: Offers identical functionality but with a 10 MHz internal clock instead of 20 MHz. Si8935B-ISR: Requires an external clock signal on the ACLK pin.