SI8921BD-IS4R

The SI8921BD-IS4R is a versatile isolation amplifier with impressive features. It offers low-voltage differential input options of ±62.5 mV and ±250 mV, low signal delay (0.8 μs), and excellent precision with a typical input offset of ±0.40 μV and typical gain error of ±0.06%. This amplifier excels in maintaining precision even under varying temperature conditions, with an offset drift of 0.5 μV/°C and a typical gain drift of -9 ppm/°C. It has low nonlinearity (0.003% full-scale), a high signal-to-noise ratio (82 dB), and low total harmonic distortion (-88 dB). Additionally, it offers a high common-mode transient immunity of 75 kV/μs and automotive-grade options with AEC-Q100 qualification and comprehensive documentation support. With compact packages and an operating temperature range of -40 to 125 °C, the SI8921BD-IS4R is a high-performance solution suitable for a wide range of applications.

• Industrial, HEV and renewable energy inverters

• AC, brushless, and DC motor controls and drives

• Variable speed motor control in consumer white goods

• Isolated switch mode and UPS power supplies

• Automotive on-board chargers, battery management systems, and charging stations

The Si8921 and Si8922 galvanically isolated analog amplifiers feature low-voltage differential input, ideal for measuring voltage across a current shunt resistor or any place where a sensor must be isolated from the control system. The output is a differential analog signal amplified by either 8.2x or 32.8x.

The very low signal delay of the Si8921/22 allows control systems to respond quickly to fault conditions or changes in load. Low offset and gain drift ensure that accuracy is maintained over the entire operating temperature range. Exceptionally high common-mode transient immunity means the Si8921/22 delivers accurate measurements even in the presence of high-power switching as found in motor drive systems and inverters.

The Si8921/22 isolated voltage sensing amplifier utilizes Skyworks proprietary isolation technology, and withstands up to 5.0 kVRMS per UL1577. This technology enables high performance, reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes compared to other isolation technologies. Automotive Grade is available for certain part numbers. These products are built using automotive-specific flows at all steps in the manufacturing process to ensure the robustness and low defectivity required for automotive applications.

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