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+3.3V Programmable LVDS Transmitter 24-Bit Flat Panel Display (FPD) Link-65 MHz
National Semiconductor
Description
The DS90C383B transmitter converts 28 bits of CMOS/TTL data into four LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth LVDS link. Every cycle of the transmit clock 28 bits of input data are sampled and transmitted. At a transmit clock frequency of 65 MHz, 24 bits of RGB data and 3 bits of LCD timing and control data (FPLINE, FPFRAME, DRDY) are transmitted at a rate of 455 Mbps per LVDS data channel. Using a 65 MHz clock, the data throughput is 227 Mbytes/sec. The DS90C383B transmitter can be programmed for Rising edge strobe or Falling edge strobe through a dedicated pin. A Rising edge or Falling edge strobe transmitter will interoperate with a Falling edge strobe Receiver (DS90CF386) without any translation logic. This chipset is an ideal means to solve EMI and cable size problems associated with wide, high speed TTL interfaces.
Features
• No special start-up sequence required between clock/data and /PD pins. Input signal (clock and data) can be applied either before or after the device is powered.
• Support Spread Spectrum Clocking up to 100kHz frequency modulation & deviations of ±2.5% center spread or -5% down spread.
• "Input Clock Detection" feature will pull all LVDS pairs to logic low when input clock is missing and when /PD pin is logic high.
• 18 to 68 MHz shift clock support
• Best-in-Class Set & Hold Times on TxINPUTs
• Tx power consumption < 130 mW (typ) @65MHz Grayscale
• 40% Less Power Dissipation than BiCMOS Alternatives
• Tx Power-down mode < 60µW (typ)
• Supports VGA, SVGA, XGA and Dual Pixel SXGA.
• Narrow bus reduces cable size and cost
• Up to 1.8 Gbps throughput
• Up to 227 Megabytes/sec bandwidth
• 345 mV (typ) swing LVDS devices for low EMI
• PLL requires no external components
• Compatible with TIA/EIA-644 LVDS standard
• Low profile 56-lead TSSOP package
• Improved replacement for: SN75LVDS83, DS90C383A
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