SI8922AD-IS4R

Special Purpose Amplifiers Overview

The SI8922AD-IS4R is a galvanically isolated analog amplifier from the Si8922 series, designed for current shunt measurement. It features a single-ended output and accepts low-voltage differential inputs with a specified linear range of 8 to 68.5 mV. The device provides a typical gain of 32.8x, resulting in a full-scale output of approximately 2.05 V. It utilizes CMOS isolation technology supporting up to 5.0 kVRMS withstand voltage per UL1577. Key electrical characteristics include a signal delay of 1 µs, an amplifier bandwidth of 600 kHz, and high common-mode transient immunity of 75 kV/µs.

Special Purpose Amplifiers Feature Summary

• Galvanic isolation via proprietary CMOS technology for accurate signal transmission across high-voltage barriers
• Fail-safe output mode that activates upon loss of input supply voltage (VDDA)
• Low input offset voltage and drift specifications ensuring accuracy over temperature variations
• High common-mode transient immunity suitable for noisy switching environments

Special Purpose Amplifiers Applications

• Industrial inverters
• Electric vehicle (HEV) power systems
• Renewable energy inverters
• AC, brushless, and DC motor controls and drives
• Isolated switch mode and UPS power supplies

Special Purpose Amplifiers Procurement Notes

Verify the specific suffix 'IS4R' corresponds to the reel packaging format and Moisture Sensitivity Level 2A rating as documented in the datasheet. Confirm that the automotive-grade designation is not required if standard industrial qualification suffices. Ensure the input range matches the ±62.5 mV specification associated with the 'A' variant within the part number structure.

Special Purpose Amplifiers Selection Notes

Select this component when a single-ended output is preferred over the differential output provided by the Si8921 series. The 32.8x gain option is appropriate for measuring very small shunt voltages, such as those around 62.5 mV full scale. Consider the 600 kHz bandwidth and 1 µs delay for applications requiring moderate speed response without the complexity of differential ADC interfacing.

Special Purpose Amplifiers Part Context

This device belongs to the Si8921/Si8922 family of isolated amplifiers manufactured by Skyworks Solutions. While the Si8921 offers a differential output, the Si8922 provides a single-ended output on pin AO. Both share similar isolation capabilities and input options, with the 'D' suffix indicating the 5.0 kVRMS insulation rating.

Special Purpose Amplifiers Replacement Considerations

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