SKYWORKS SI8922BB-ISR

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 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.

• Low-voltage differential input: ±62.5 mv and ±250 mv options
• Low signal delay: 0.8 μs
• Typical input offset: ±0.40 μv
• Typical gain error: ±0.06%
• Excellent drift specifications
  • 0.5 μV/°C offset drift
  • -9 ppm/°C typical gain drift
• Typical nonlinearity: 0.003% full-scale
• Typical SNR: 82 dB over 100 kHz bandwidth
• Typical THD: –88 dB
• High common-mode transient immunity: 75 kV/μs
• Automotive-grade OPNs available
• AEC-Q100 qualification
• AIAG-compliant PPAP documentation support
• IMDS and CAMDS listing support
• Compact packages
  • 8-pin wide body stretched SOIC
  • 8-pin narrow body SOIC
• –40 to 125 °C

• 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