NXP Semiconductors introduced the IP4786CZ32, a highly integrated HDMI signal-conditioning IC which provides the industry’s highest levels of protection for HDMI 1.4 transmitter applications. Featuring a unique Transmission Line Clamping architecture that provides lower peak clamping voltages during an ESD strike, the IP4786 delivers strong ESD protection, the best signal integrity and the highest level of integration available in the industry today.

Transmission Line ESD Protection System for HDMI TransmittersDesigned for home entertainment systems, such as set-top boxes, standard-definition (SD) and high-definition (HD) DVD players, Blu-ray players and A/V switches, the IP4786 also features extremely low power consumption in standby mode, making it ideal for mobile applications such as portable media players, notebooks and tablets, game consoles, mobile phones, and digital camcorders and cameras.

The IP4786CZ32 is designed to protect High-Definition Multimedia Interface (HDMI) transmitter host interfaces. It includes HDMI 5 V overcurrent / overvoltage protection, Data Display Channel (DDC) buffering and decoupling, hot plug detection, backdrive protection, Consumer Electronic Control (CEC) buffering and decoupling, and ±8 kV contact ElectroStatic Discharge (ESD) protection for all I/Os in accordance with the IEC 61000-4-2, level 4 standard.

The IP4786CZ32 incorporates Transmission Line Clamping (TLC) technology on the high-speed Transition Minimized Differential Signaling (TMDS) lines to simplify routing and help reduce impedance discontinuities. “Zero-clamping” buffers on the control lines completely isolate these signals from an ESD strike. All TMDS lines are protected by an impedance-matched diode configuration that minimizes impedance discontinuities caused by typical shunt diodes. The IP4786CZ32 was designed to provide the fewest components and smallest board footprint of any HDMI signal conditioning and protection solution.

Features of IP4786 Transmission Line ESD Protection System

  • HDMI 1.3a and 1.4, 340 MHz pixel clock, deep color and HDMI Ethernet and Audio return Channel (HEAC) compatible
  • Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen and antimony (Dark Green compliant)
  • Robust ESD protection without degradation after repeated ESD strikes
  • Impedance matched 100 Ω differential transmission line ESD protection for TMDS lines (±10 Ω). No Printed-Circuit Board (PCB) pre-compensation required
  • All external I/O lines with ESD protection of at least ±8 kV in accordance with the IEC 61000-4-2, level 4 standard
  • DDC capacitive decoupling between system side and HDMI connector side and buffering to drive cable with high capacitive load (> 700 pF/25 m)
  • Hot plug detect module
  • CEC buffering and isolation, with integrated backdrive-protected 26 kΩ pull-up
  • Simplified flow-through routing utilizing less overall PCB space
  • Highest integration in a small footprint, PCB level, optimized RF routing, 32-pin HVQFN leadless package