1FEATURES

2• 5 MHz–43 MHz Embedded Clock & DCBalanced

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

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.