NXP公司的IP4776CZ38是全集成的HDMI接口器件,集成了电平转移,ESD和背驱保护等功能. IP4776CZ38和HDMI 1.3兼容,每路的线电容仅为0.7pF,线间隔和0.5mm匹配,提供可用于DDC时钟和数据通路的双向电平转移N沟FET, ESD保护±8 kV,主要用在TV,图像卡,STB,DVD,数字媒体适配器和游戏控制台.本文介绍了IP4776CZ38主要特性和优势, 功能方框图, HDMI发送器和接收器应用框图以及PCB布局方案框图.
Fully integrated HDMI interface with level shifter, ESD and backdrive protection
The IP4776CZ38 is designed for HDMI host-interface protection. The IP4776CZ38 includes level shifting for the DDC channels and backdrive protection for HDMI as well as high-level ESD protection diodes for the TMDS signal lines.
The level shifting function is required when the receiver operates at a supply voltage lower than the external devices to protect the I/Os against over voltages. The IP4776CZ38 contains four N-channel MOSFETs to provide this level shifting function.
Furthermore, all TMDS intra-pairs are protected by a special diode configuration offering an ultra low line capacitance of 0.7 pF only. These diodes provide protection to downstream components from ESD voltages up to ±8 kV contact according to the IEC 61000-4-2, level 4 standard.

IP4776CZ38主要特性和优势:
Pb-free and RoHS compliant, Dark Green
Integrated high-level ESD protection, level shifting and backdrive protection
All TMDS lines with integrated rail-to-rail clamping diodes with downstream ESD protection of ±8 kV according to IEC 61000-4-2, level 4 standard
Matched 0.5 mm trace spacing
Bidirectional level shifting N-channel FETs provided for DDC clock and data channels
TMDS lines with ≤ 0.05 pF matching of capacitance between the TMDS pairs
Ultra low line capacitance of 0.7 pF per channel
HDMI 1.3 compliant
Backdrive protection
38-pin TSSOP lead-free package

IP4776CZ38应用:
The IP4776CZ38 is designed for HDMI receiver and transmitter port protection, level
shifting and backdrive protection e.g.:
TV
Graphics card
Set-top box
DVD
Digital media adapter
Game console

图1.IP4776CZ38功能方框图

图2.IP4776CZ38的热插拔,电平转移和背驱保护框图

图3.IP4776CZ38 HDMI发送器应用框图

图4.IP4776CZ38 HDMI接收器应用框图

图5.IP4776CZ38 PCB布局方案框图