Power Electronics

LVDS SerDes chipset meets high-temp analog interface requirements

National Semiconductor Corporation has introduced a low-voltage differential signaling (LVDS) chipset consisting of a SCAN921025H serializer and SCAN921226H deserializer.

The analog interface chips operate in environments up to 1258 C, which suits them for automotive applications such as video cameras mounted in automotive roof enclosures. The chips can deliver up to 10 bits of digital data at 20 MHz to 80 MHz over a single point-to-point differential interconnect in backplanes or cable, with data payloads ranging from 200 Mbps to 800 Mbps. The SCAN921025H serializer transforms a 10-bit wide parallel LVCMOS/LVTTL data bus into a single high-speed serial datastream with embedded clock. The SCAN921226H receives the LVDS serial datastream and converts it back into a 10-bit-wide parallel databus plus clock.

“The single serial-data path makes PCB design easier, and the reduced cable, PCB trace count, and connector size significantly reduces cost,” says Jeff Waters, product line director for National’s Communications Interface division. “Also, embedding the clock in the serial datastream eliminates clock-to-data and data-to-data skew problems.” To aid application development, both chips feature integrated BIST (built-in self-test) and JTAG.

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