AOZ804x EMI Filters

By Alpha & Omega Semiconductor Inc 92

AOZ804x EMI Filters

Alpha & Omega Semiconductor's AOZ804x family consists of a 4-, 6-, and 8-line device integrating EMI filtering with ESD protection for each line. It is designed to suppress unwanted EMI/RFI signals and provide electrostatic discharge (ESD) protection in portable electronic equipment. This state-of-the-art device utilizes AOS leading edge Trench Vertical Structure [TVS]2™ technology for superior clamping performance and filter attenuation over the full operating display range. The AOZ8045 has been optimized for protection of color LCD displays and CCD camera lines in cellular phones and other portable consumer electronic devices.

The AOZ804x devices consists of four, six, or eight identical circuits comprised of TVS diodes for ESD protection, and a resistor–capacitor network for EMI/RFI filtering. A series resistor value of 100 Ω and a capacitance value of 9pF are used to achieve -20 dB minimum attenuation from 1.0 GHz to 3.0 GHz. The TVS diodes provide effective suppression of ESD voltages in excess of ±20 kV (contact discharge) and ±20 kV (air discharge).

  • Trench vertical structure [TVS]2™ based technology used to achieve excellent ESD clamping and filter performance over the full operating display range
  • Filter performance: -20 db attenuation from 1.0 GHz to 3.0 GHz
  • 4-, 6-, 8-line for EMI filtering and ESD protection:
    • Exceeds IEC 61000-4-2, level 4 (ESD) immunity test
    • ±20 kV (contact discharge) and ±20 kV (air discharge)
  • Low operating voltage: 5.0 V
  • EMI filtering and ESD protection for data lines
  • LCD displays, camera interface, I/O interface
  • Portable handheld devices, cell phones, PDA phones