原标题：Maxim MAX9291吉比特多媒体串行链接(GMSL)解决方案

　　Maxim公司的MAX9291/MAX9293是用于同轴电缆或屏蔽双绞线(STP)输出和HDMI输入的3.12Gbps GMSL串行化器,用来在15米或更长的50欧姆同轴电缆或100欧姆屏蔽双绞线上发送视频,音频和控制信号,主要用在高分辨率汽车导航,后座娱乐系统和百万相素照相系统.本文介绍了MAX9291/MAX9293主要特性和优势和功能框图,典型应用电路图以及MAX9291/MAX9293评估板主要特性,电路图,材料清单和PCB设计图.

　　The MAX9291/MAX9293 GMSL serializers convert an HDMI input to a gigabit multimedia serial link (GMSL) output for transmission of video, audio, and control signals over 15m or more of 50Ω coax or 100Ω shielded twisted-pair (STP) cable. The MAX9293 has HDCP content protection, but is otherwise the same as the MAX9291. The serializers pair with any GMSL deserializer capable of coax input. When programmed for STP output, the serializers are backward compatible with any GMSL deserializer. The output amplitude is programmable 100mV to 500mV single-ended (coax) or 100mV to 400mV differential (STP).

　　The audio channel supports L-PCM I2S stereo and up to eight channels of L-PCM in TDM mode. Sample rates of 32kHz to 192kHz are supported with sample depth up to 32 bits.

　　The embedded control channel operates at 9.6kbps to 1Mbps in UART-to-UART and UART-to-I2C modes, and up to 1Mbps in I2C-to-I2C mode. Using the control channel, a μC can program serializer, deserializer, and peripheral device registers at any time, independent of video timing and manage HDCP operation (MAX9293). A GPO output supports touch-screen controller interrupt requests from the remote end of the link.

　　For use with longer cables, the serializers have programmable pre/deemphasis. Programmable spread spectrum is available on the serial output. The serial output meets ISO 10605 and IEC 61000-4-2 ESD standards. The core supply is 1.8V and 3.3V and the I/O supply is 1.7V to 3.6V. The package is a lead(Pb)-free, 56-pin, 8mm x 8mm TQFN with exposed pad and 0.5mm lead pitch.

　　MAX9291/MAX9293主要特性和优势:

　　Ideal for High-Definition Video ApplicationsHDMI 1.4a Input with Integrated Input Equalizer, DDC, and Input Termination

　　Drives Low-Cost 50Ω Coax Cable and FAKRA Connectors or 100Ω STP Cable

　　104MHz High-Bandwidth Mode Supports 1920 x 720p/60Hz Display with 24-Bit Color

　　Serializer Pre/Deemphasis Allows 15m Cable at Full Speed

　　Up to 192kHz Sample Rate and 32-Bit Sample Depth for 7.1 Channel HD Audio

　　Multiple Data Rates for System FlexibilityUp to 3.12Gbps Serial-Bit Rate

　　25MHz to 104MHz Pixel Clock

　　9.6kbps to 1Mbps Control Channel in UART, Mixed UART/I2C, or I2C Mode with Clock-Stretch Capability

　　Reduces EMI and Shielding RequirementsSerial Output Programmable for 100mV to 500mV Single-Ended or 100mV to 400mV Differential

　　Programmable Spread Spectrum Reduces EMI

　　Tracks Spread Spectrum on Input

　　High-Immunity Mode for Maximum Control-Channel Noise Rejection

　　Peripheral Features for System Power-Up and VerificationBuilt-In PRBS Generator for BER Testing of the Serial Link

　　Programmable Choice of 9 Default Device Addresses

　　Dedicated “Up/Down” GPO for Touch-Screen Interrupt and Other Uses

　　Remote/Local Wake-Up from Sleep Mode

　　Meets Rigorous Automotive and Industrial Requirements-40°C to +105°C Operating Temperature

　　±8kV Contact and ±15kV Air ISO 10605 and IEC 61000-4-2 ESD Protection

　　MAX9291/MAX9293应用:

　　High-Resolution Automotive Navigation

　　Rear-Seat Infotainment

　　Megapixel Camera Systems

　　图1.MAX9291/MAX9293功能框图

　　图2.MAX9291典型应用电路图

　　MAX9291/MAX9293评估板

　　The MAX9291/MAX9293 evaluation kit (EV kit) providesa proven design to evaluate the MAX9291/MAX9293HDMI input with high-bandwidth gigabit multimedia seriallink (GMSL) output serializer with spread spectrum andfull-duplex control channel with the use of a standardFAKRA coaxial cable. The EV kit also includes WindowsVista?- and Windows? 7-compatible software thatprovides a simple graphical user interface (GUI) forexercising features of the serializers. The EV kit comeswith a MAX9291 or MAX9293 IC installed.

　　For complete GMSL evaluation using a standard FAKRAcoax cable, order the MAX9291/MAX9293 coax EV kit anda companion serializer board (MAX9276A/MAX9280Acoax EV kit referenced in this document). For testing withSTP cable, also order the MAXCOAX2STP-HSD adapterkit. Only one adapter kit is needed per link (connecting theserializer and deserializer boards).

　　MAX9291/MAX9293评估板主要特性:

　　● HDMI Input GMSL Serial Output

　　● Windows Vista- and Windows 7-Compatible Software

　　● USB-Controlled Interface (Cable Included)

　　● USB Powered

　　● Proven PCB Layout

　　● Fully Assembled and Tested

　　MAX9291/MAX9293评估板材料清单(BOM):