Four-channel video encoder addresses parking assist systems

February 16, 2015 // By Christoph Hammerschmidt
High integration at the chip level, combined with excellent video quality is what Intersil is offering with its TW9984 four-channel analog video encoder for surround-view parking assist and backup camera applications. With its high integration, the chip replaces up to nine separate components. In addition, Intersil promises excellent image quality.

The ADAS market today is driven largely by safety requirements in light passenger vehicles. Around-view camera systems for blind spot detection and parking assistance are available either as standard configuration or as option. Safety  estimate that rearview cameras can reduce back-over fatalities by more than 50 percent. Accordingly, automotive image sensor penetration in vehicles is increasing, and ABI Research estimates shipments will reach 197 million by 2020.

The Intersil TW9984 analog video decoder and encoder provides motorists with high-quality video, enhancing their ability to see objects behind the car as well as around the entire vehicle. An around-view monitor system, also referred to as a surround view monitor, processes video from four cameras and then combines the four images into a single birds-eye, top-down view as if a camera was stationed directly above the vehicle. The monitor helps drivers visually confirm the vehicle’s position relative to surrounding objects for easy manoeuvring and parking.

The device integrates four analog video decoders (NTSC / PAL standards) with 10-bit analog-to-digital converters (ADCs) to support four analog camera inputs simultaneously.  The on-chip analog video encoder provides the ability to transmit the combined video as a standard analog composite signal to the head unit display. The automotive-qualified TW9984 also incorporates analog anti-aliasing filters on each channel input to further reduce component count. The high level of integration helps to simplify the system design and minimize the solution footprint to preserve critical board space.

With a power consumption of about 100 mW per channel, the TW9984 consumes some 20 percent less than comparable solutions. Supporting the 108MHz time-multiplexed ITU-R BT.656 format allows the chip to output four channels over a single 8-bit data bus. Besides the four decoders, the TW9984 also integrates an analog video encoder to re-encode the video signal to the CVBS format.

The TW9984 four-channel analog video decoder and encoder is available now in a 10mm x 10mm, WQFN package and is priced