Infotainment displays on the move
05 October 2009
The industry’s first serializer and deserializer (SerDes) chipsets with a 65MHz clock.
National Semiconductor has introduced two new additions to their FPD-Link II SerDes chipset family, which deliver a scalable pixel clock range (5MHz to 65MHz), enabling a modular platform for low-resolution (WQVGA) through high-resolution (XGA) infotainment displays.
The higher resolution XGA display offers consumers an enhanced video experience, while the SerDes chipsets support an automobile manufacturer’s vehicle portfolio, from luxury to base models.
The new additions include the DS90UR905Q serializer and DS90UR906Q deserializer, which use a low-voltage CMOS (LVCMOS) parallel interface, and the DS90UR907Q serializer and DS90UR908Q deserializer, which use a low-voltage differential signalling (LVDS) interface. The chipsets connect the graphics host processor with central information displays, rear seat displays, console displays and instrument panel displays. Having a choice in SerDes input and output interfaces allows the designer to select from an array of video sources and display panels. National’s FPD-Link II chipsets provide a way to serially route video content beyond 10 metres to single or multiple displays in the driver and passenger compartments.
To protect adjacent circuitry from electromagnetic interference (EMI), the DS90UR90xQ family features a serial-output voltage-level selection for minimum differential voltage swing and user-selectable de-emphasis to further reduce differential voltage swing. The chipsets also mitigate EMI with spread-spectrum clocking (SSC) support from the serializer input to the deserializer output. The SerDes’ EMI performance ensures there is no interference with the automobile-control system electronics.
The DS90UR905Q and DS90UR907Q serializers embed the clock, randomise, balance, and scramble the data payload, level shift the wide parallel video bus and serialize it to a single pair. Both serializers operate at speeds of 140Mbps to 1.8Gbps and support 18bits per pixel (bpp) and 24bpp colour displays. They operate with either a 1.8V or 3.3V I/Os and feature integrated termination resistors to save board space and reduce cost.
They are Grade 2 qualified for operation between -40 degrees C and 105 degrees C and also include a built-in self test (BIST) mode for factory test, system start up and diagnostics. Both devices are backward-compatible with previous generation FPD-Link II deserializers. The DS90UR905Q is offered in a 48pin LLP package and the DS90UR907Q is supplied in a 36pin LLP package.
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