Lower Rx clock rate cuts EMI from LCD panel connections
Texas Instruments’ LVDS receiver IC can use a a 4-MHz pixel clock in designs that employ small LCD panels. Compared to competitive devices, the SN65LVDS822 FlatLink LVDS receiver accepts a lower pixel clock, enabling 30% longer video transmission distance, with 60% fewer wires, to reduce electromagnetic interference (EMI) and power consumption. Its features include;
– pixel clock range of 4 MHz to 54 MHz to enable panel resolutions of 160 by 120 (QQVGA) to 1024 by 600 (WUXGA) at 60 frames per second (fps) with 24 bit-per-pixel (bpp) colour that, until now, required parallel LVTTL/LVCMOS interfaces.
– a reduced wire count results from support for both 4:27 and 2:27 deserialisation, providing the flexibility to further reduce wire count. The 2:27 mode with 14x sampling enables a 40% lane count reduction to two data lanes for systems with tight space constraints.
– flexible PCB layout and low EMI is assisted by a bus swap feature and reduced LVDS swing, while the 3-way selectable CMOS slew rate control reduces EMI by matching the slew rate with the needs of the application.
The LVCMOS output supports 1.8-V to 3.3-V CMOS signals
The SN65LVDS822RGZEVM evaluation module costs $99; the SN65LVDS822, in a 7 x 7 mm, 48-pin QFN package costs $2.81 (1000).
Texas Instruments; www.ti.com/sn65lvds822-pr
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