The Automotive High Definition Link (AHL) platform comes with two evaluation boards (EVB). One is an AHL transmitter with integrated AHL encoder (RAA279971), HDMI input connector and camera module interface that offers users a high degree of flexibility to test a variety of video sources and resolutions. The other board is an AHL receiver that includes an integrated decoder (RAA279972), an LCD video processor (RAA278842), and an LVDS output interface to display images on an included 10” LCD screen.
The AHL evaluation board platform combines hardware, firmware and software to give the users easy access for quick evaluation of the RAA279971 AHL encoder and RAA279972 AHL decoder. The platform also includes pre-programmed RAA279971 chip register settings to convert the digital input video content into an analog AHL signal. The video is transmitted across a twisted pair cable to the RAA279972 AHL decoder evaluation board which receives the analog signal, converts it back to a digital signal and displays the image on the LCD panel. The AHL EVB platform supports 720p/30Hz, 720p/60Hz and 1080p/30Hz; for non-standard resolutions, the registers must be manually adjusted through the GUI terminal interface tool which is provided with the evaluation boards.
The RAA279972 is a high-definition analog video decoder designed for automotive applications. It supports single-ended, differential and pseudo-differential analog composite high-definition AHL video inputs. The high-quality 10-bit video ADC converts the signal to digital, and a proprietary AHL adaptive comb filter separates Luma and Chroma data to output a YUV422 digital video signal over a two-lane MIPI-CSI2 interface, digital video port (DVP) or a BT.656 parallel interface. The RAA279972 has integrated short-to-battery and short-to-ground detection and image enhancement features, making it an ideal solution for demanding high-resolution automotive camera applications. When paired with the RAA279971 encoder, an analog video link is established over a single wire pair.