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Intersil claims first video SerDes transceiver for car camera systems

Milpitas, Calif. &151; Intersil Corp. has claimed the industry’s first video serializer/deserializer (SerDes) transceiver aimed at automotive rear view safety systems. The ISL76321 single-chip SerDes interface IC simplifies system design by sending video data, bi-directional control information and power across a single shielded twisted-pair (STP) cable. The interface chip allows designers to lower system costs and simplify designs while improving transmission distance and video image quality, said Intersil.

The ISL76321 concentrates up to 16-bits wide video data and bi-directional I2C control information onto a single high-speed STP cable, and can transmit data in excess of 20 meters. Remote control of the far end of the link allows a controller to access an imager via its I2C interface through which operating modes and adjustments, such as exposure and windowing, can be made. This feature facilitates camera operation under dynamically changing conditions, said Intersil.

Intersil said by sending control data over the same cable as the video data, it eliminates unnecessary complexity in wiring looms and reduces weight.

intersilisl76321

A camera link is comprised of a pair of ISL76321s connected via a single STP cable, which establishes a high resolution, serial data link between a remote video camera and a central control unit. This interface transceiver accommodates a wide pixel clock range from 8 MHz to 50 MHz, and raw data rates up to 1000 Mbits/s. This provides a link for a host of automotive video-based passive and active safety systems including lane departure warning, signpost recognition and pedestrian avoidance systems.

The U.S. National Highway Traffic Safety Administration has proposed backup cameras on all new vehicles in the U.S. by 2014 to reduce the dangers of drivers backing over pedestrians.

The ISL76321 uses industry standard 8b/10b encoding to improve signal integrity and to provide hot plugging capability. Even in the noisiest environments, the fast line-rate locking PLL system (10 microseconds to lock compared to >10 milliseconds with competing devices) helps ensure the reliability of the link, said Intersil.

The ISL76321 enhances range by adding transmission pre-emphasis and cable equalization (EQ). These features have 16 levels of programmability, enabling the product to drive 20 meters of cable with multiple in-line connectors. Alternatively, in shorter distance applications the ISL76321 permits the use of lower cost cables to further reduce system costs. The transceivers’ EQ increases the signal-to-noise ratio at the receiver end with no increase to radiated EMI, according to the company.

Intersil also said the new interface solution helps to facilitate the implementation of a low cost power-over-LVDS scheme for modest load currents (up to one amp). This type of system can supply remote end power over the same STP cable, further reducing wiring loom complexity, cost and weight, along with simplifying the OEM installation challenges, said the company.

The ISL76321 is qualified to AECQ100 grade 2 (-40°C to 105°C).

Availability: Currently sampling to qualified customers with volume production scheduled for January 2011. An evaluation system (transmit and receiver boards and a Molex HSALink cable system) is available.

Pricing: Supplied in a 48-lead TQFN package, the ISL76321is priced at $4.55 each in quantities of 1,000.

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