SKYWORKS SI8937D-IS4

The Si8935/36/37 are galvanically isolated delta-sigma modulators optimized for voltage sensing. Its 2.5 V input range is ideal for isolated voltage sensing applications. The Si8935/ 36/37 provides excellent linearity with low offset and gain drift to ensure that accuracy is maintained over the entire operating temperature range. Exceptionally high common - mode transient immunity means that the Si8935/36/37 delivers accurate measurements even in the presence of high - power switching found in motor drive systems and inverters. The output of the Si8935/36/37 comes from a second - order, delta - sigma modulator. The modulator can be clocked either from an on - board oscillator (Si8936/37) or from an external clock (Si8935). The output is typically digitally filtered by a MCU or FPGA in the system. The Si8935/36/37 isolated delta - sigma modulators utilize proprietary isolation technology. It supports up to 5.0 kVRMS withstand voltage per UL1577. This technology enables higher 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.

• 0 to 2.5 V nominal input voltage
• Modulator clock options
  • External clock up to 25 MHz (Si8935)
  • 10 MHz internal clock (Si8936)
  • 20 MHz internal clock (Si8937)
• Typical input offset: ±0.4 mV
• Typical gain error: ±0.05%
• Excellent drift specifications
  • ±0.5 μV/°C typical offset drift
  • 9 ppm/°C typical gain drift
• Typical nonlinearity: 0.003%
• Typical SNR: 86 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
• General industrial data acquisition and sensor interface
• Automotive on - board chargers, battery management systems, and charging stations