SI8922BD-IS4R

Special Purpose Amplifiers Overview

The Skyworks SI8922BD-IS4R is a galvanically isolated analog amplifier featuring a single-ended output and a specified full-scale input range of ±250 mV. It provides a fixed gain of 8.2x with an amplifier bandwidth of 600 kHz. The device supports supply voltages from 3.0 V to 5.5 V on both the input (VDDA) and output (VDDB) sides, drawing typical supply currents of 4.5 mA and 4.3 mA respectively at 3.3 V. It utilizes CMOS isolation technology rated for up to 5.0 kVRMS withstand voltage per UL1577. Key performance metrics include a typical signal delay of 1 µs, high common-mode transient immunity of 75 kV/µs, and low input offset voltage of ±0.07 mV.

Special Purpose Amplifiers Feature Summary

• Galvanic isolation using proprietary CMOS technology for high reliability and long lifetimes
• Low-voltage differential input optimized for direct connection to current shunt resistors
• Fail-safe output mode that activates during loss of input supply voltage
• High common-mode transient immunity suitable for noisy switching environments

Special Purpose Amplifiers Applications

• Current shunt measurement in industrial inverters
• Isolated sensing in high-efficiency vehicle (HEV) power systems
• Motor control and drive circuits for AC and brushless motors
• Battery management systems and automotive onboard chargers

Special Purpose Amplifiers Procurement Notes

Verify the specific suffix IS4R indicates reel packaging when sourcing. Confirm the BD designation corresponds to the ±250 mV input range variant. Ensure compatibility with MSL2A moisture sensitivity requirements during assembly. Check for AEC-Q100 qualification if automotive grade documentation is required for the final system design.

Special Purpose Amplifiers Selection Notes

Select this component when a single-ended output is preferred over differential. The ±250 mV input range suits applications with higher sense resistor values or lower gain requirements compared to the ±62.5 mV variant. Verify that the 600 kHz bandwidth meets the system's signal frequency needs. Ensure the 5.0 kVRMS isolation rating aligns with the safety standards of the target application environment.

Special Purpose Amplifiers Part Context

This part belongs to the Si8922 series of isolated amplifiers designed for precise current sensing. It shares the same isolation architecture and pinout as the Si8921 but differs in providing a single-ended analog output instead of a differential one. The family is engineered for high-accuracy measurements in electric vehicle and industrial power conversion systems.

Special Purpose Amplifiers Replacement Considerations

Si8922AD-IS4R: Identical electrical specifications but features a ±62.5 mV input range instead of ±250 mV.