DS25BR204 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 3.125 Gbps 1:4 LVDS Repeater with Transmit Pre-Emphasis and Receive Equalization

November 20, 2007
DS25BR204
3.125 Gbps 1:4 LVDS Repeater with Transmit Pre-
Emphasis and Receive Equalization
General Description
The DS25BR204 is a 3.125 Gbps 1:4 LVDS repeater opti-
mized for high-speed signal routing and switching over lossy
FR-4 printed circuit board backplanes and balanced cables.
Fully differential signal paths ensure exceptional signal in-
tegrity and noise immunity.
The device has two different LVDS input channels and a se-
lect line determines which input is active. Both inputs have
programmable equalization providing maximum signal
strength. A loss-of-signal (LOS) circuit monitors both input
channels and a unique LOS pin reports when no signal is de-
tected at that input.
Wide input common mode range allows the switch to accept
signals with LVDS, CML and LVPECL levels; the output levels
are LVDS. A very small package footprint requires a minimal
space on the board while the flow-through pinout allows easy
board layout. Each differential input and output is internally
terminated with a 100Ω resistor to lower device return losses,
reduce component count and further minimize board space.
Features
■ ^{DC - 3.125 Gbps low jitter, low skew, low power operation}
■ ^{Pin selectable transmit pre-emphasis and receive}
equalization eliminate data dependant jitter
■ ^{Wide Input Common Mode Range allows DC-coupled}
interface to LVDS, CML and LVPECL drivers
■ ^{On-chip 100Ω input and output termination minimizes}
insertion and return losses, reduces component count and
minimizes board space
■ ^{8 kV ESD on LVDS I/O pins protects adjoining}
components
■ ^{Small 6 mm x 6 mm LLP-40 space saving package}
Applications
■ ^{Clock and data distribution}
■ ^{Clock and data buffering and muxing}
■ ^{OC-48 / STM-16}
■ ^{SD/HD/3GHD SDI Routers}
Typical Application
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