Maxim 公司的MAX9268是并串轉(zhuǎn)換器,采用Maxim公司的吉比特多媒體串行連接(GMSL)技術(shù). MAX9268具有LVDS系統(tǒng)接口,采用1.5米屏蔽雙絞線對(STP)電纜數(shù)據(jù)速率可達(dá)2.5Gbps,最大時鐘速率為104MHz (3路LVDS)或78MHz (4路LVDS),支持帶24位色彩的WXGA (1280 × 800),主要用在高分辨率汽車導(dǎo)航,百萬像素照相機(jī)系統(tǒng)和汽車后座娛樂系統(tǒng).本文介紹了MAX9268主要特性,以及MAX9268評估板主要特性,電路圖和所用元件列表.

Gigabit multimedia serial link deserializer with integrated full-duplex control channel reduces EMI and saves cost

The MAX9268 deserializer utilizes Maxim’s gigabit multimedia serial link (GMSL) technology. The MAX9268 deserializer features an LVDS system interface for reduced pin count and a smaller package, and pairs with any GMSL serializer to form a complete digital serial link for joint transmission of high-speed video, audio, and bidirectional control data.

The MAX9268 allows a maximum serial payload data rate of 2.5Gbps for a 15m shielded twisted-pair (STP) cable. The deserializer operates up to a maximum output clock rate of 104MHz (3-channel LVDS) or 78MHz (4-channel LVDS). This serial link supports display panels from QVGA (320 x 240) to WXGA (1280 x 800) and higher with 24-bit color.

The 3-channel mode outputs an LVDS clock, three lanes of LVDS data (21 bits), UART control signals, and one I²S audio channel consisting of three signals. The 4-channel mode outputs an LVDS clock, four lanes of LVDS data (28 bits), UART control signals, an I²S audio channel, and auxiliary control outputs. The three audio outputs form a standard I²S interface, supporting sample rates from 8kHz to 192kHz and audio word lengths of 4 to 32 bits. The embedded control channel forms a full-duplex, differential, 100kbps to 1Mbps UART link between the serializer and deserializer. An electronic control unit (ECU), or microcontroller (µC), can be located on the serializer side of the link (typical for video display), on the MAX9268 side of the link (typical for image sensing), or on both sides. In addition, the control channel enables ECU/FC control of peripherals on the remote side, such as backlight control, grayscale Gamma correction, camera module, and touch screen. Base-mode communication with peripherals uses either I²C or the GMSL UART format. In addition, the MAX9268 features a bypass mode that enables full-duplex communication using custom UART formats.

The GMSL serializer driver preemphasis, along with the MAX9268 channel equalizer, extends the link length and enhances the link reliability. Spread spectrum is available to reduce EMI on the LVDS and control outputs of the MAX9268. The serial line inputs comply with ISO 10605 and IEC 61000-4-2 ESD protection standards.

The core supply for the MAX9268 is 3.3V. The I/O supply ranges from 1.8V to 3.3V. The MAX9268 is available in a 48-pin TQFP package (7mm x 7mm) with an exposed pad, and is specified over the -40℃ to +105℃ automotive temperature range.

MAX9268主要特性:

Pairs with Any GMSL Serializer

2.5Gbps Payload-Rate AC-Coupled Serial Link

Scrambled 8b/10b Line Coding

Supports WXGA (1280 × 800) with 24-Bit Color

8.33MHz to 104MHz (3-Channel LVDS) or 6.25MHz to 78MHz (4-Channel LVDS) Output Clock

4-Bit to 32-Bit Word Length, 8kHz to 192kHz I²S Audio Channel Supports High-Definition Audio

Embedded Half-/Full-Duplex Bidirectional Control Channel (100kbps to 1Mbps)

Two 3-Level Inputs Support 9 Device Addresses

Interrupt Supports Touch-Screen Functions for Display Panels

I²C Master for Peripherals

Equalizer for Serial Link Input

Programmable Spread Spectrum on the LVDS and Control Outputs for Reduced EMI

Serial-Data Clock Recovery Eliminates an External Clock

Automatic Data-Rate Detection Allows On-the-Fly Data-Rate Change

Built-In PRBS Generator for BER Testing of the Serial Link

ISO 10605 and IEC 61000-4-2 ESD Protection

-40℃ to +105℃ Operating Temperature Range

1.8V to 3.3V I/O and 3.3V Core Supplies

MAX9268應(yīng)用:

High-Resolution Automotive Navigation

Megapixel Camera Systems

Rear-Seat Infotainment

MAX9268評估板

The MAX9268 evaluation kit (EV kit) provides a proven design to evaluate the MAX9268 gigabit multimedia serial link (GMSL) with spread spectrum and full-duplex control channel. The EV kit also includes Windows XP-, Windows Vista-, and Windows 7-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX9268.

The MAX9268 EV kit comes with a MAX9268GCM/V+ installed.

MAX9268評估板主要特性:

Drives LVDS Video and I2S Audio

On-Board I2S Audio DAC (MAX9850)

On-Board Class D Audio Power Amplifier (MAX9701)

Windows XP-, Windows Vista-, and Windows 7-Compatible Software

USB-PC Connection (Cable Included)

USB Powered

Proven PCB Layout

Fully Assembled and Tested

圖1.MAX9268評估板電路圖(1)

圖2.MAX9268評估板電路圖(2)

圖3.MAX9268評估板電路圖(3)

圖4.MAX9268評估板元件布局圖
MAX9268評估板元件列表: