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( File format: PDF, 1018 Kbytes )
5-43 MHz FPD-Link LVDS (3 Data + 1 Clock) to Single Embedded Clock DC-Balanced LVDS Converter
National Semiconductor

Description
The DS99R421 converts a FPD-Link input with 4 non-DC Balanced LVDS (3 LVDS Data + LVDS Clock) plus 3 over-sampled low speed control bits into a single LVDS DC-balanced serial stream with embedded clock information. This single serial stream simplifies transferring the 24-bit bus over a single differential pair of PCB traces and cable by eliminating the skew problems between the 3 parallel LVDS data inputs and LVDS clock paths. It saves system cost by narrowing 4 LVDS pairs to 1 LVDS pair that in turn reduce PCB layers, cable width, connector size, and pins. The DS99R421 incorporates a single serialized LVDS signal on the high-speed I/O. Embedded clock LVDS provides a low power and low noise environment for reliably transferring data over a serial transmission path. By optimizing the converter output edge rate for the operating frequency range EMI is further reduced. In addition the device features pre-emphasis to boost signals over longer distances using lossy cables. Internal DC balanced encoding is used to support AC-Coupled interconnects.
Features

 • 5 MHz–43 MHz embedded clock & DC-Balanced data transmission (21 total LVDS data bits plus 3 low speed LVCMOS data bits)
 • User adjustable pre-emphasis driving ability through external resistor on LVDS outputs and capable to drive up to 10 meters shielded twisted-pair cable
 • Supports AC-coupling data transmission
 • 100Ω Integrated termination resistor at LVDS input
 • Power-down control
 • Available @SPEED BIST to DS90UR124 to validate link integrity
 • All LVCMOS inputs & control pins have internal pulldown
 • Schmitt trigger inputs on OS[2:0] to minimize metastable conditions.
 • Outputs Tri-Stated through DEN
 • On-chip filters for PLLs
 • Power supply range 3.3V ± 10%
 • Automotive temperature range −40°C to +105°C
 • Greater than 8kV ESD Tolerance
 • Meets ISO 10605 ESD and AEC-Q100 compliance




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