DS25BR100 Datasheet, PDF (1/14 Pages) –

April 2007
DS25BR100
3.125 Gbps LVDS Buffer with Transmit Pre-Emphasis and
Receive Equalization
General Description
The DS25BR100 is a single channel 3.125 Gbps LVDS buffer
optimized for high-speed signal transmission over lossy FR-4
printed circuit board backplanes and balanced metallic ca-
bles. Fully differential signal paths ensure exceptional signal
integrity and noise immunity.
The DS25BR100 features transmit pre-emphasis (PE) and
receive equalization (EQ), making it ideal for use as a re-
peater device. Other LVDS devices with similar IO character-
istics include the following products. The DS25BR120
features four levels of pre-emphasis for use as an optimized
driver device, while the DS25BR110 features four levels of
equalization for use as an optimized receiver device. The
DS25BR150 is a buffer/repeater with the lowest power con-
sumption and does not feature transmit pre-emphasis nor
receive equalization.
Wide input common mode range allows the receiver to accept
signals with LVDS, CML and LVPECL levels; the output levels
are LVDS. A very small package footprint requires minimal
space on the board while the flow-through pinout allows easy
board layout. The differential inputs and outputs are internally
terminated with a 100Ω resistor to lower device input and out-
put return losses, reduce component count, and further min-
imize board space.
Features
■ ^{DC - 3.125 Gbps low jitter, high noise immunity, low power}
operation
■ ^{Receive equalization reduces ISI jitter due to media loss}
■ ^{Transmit pre-emphasis drives lossy backplanes and}
cables
■ ^{On-chip 100Ω input and output termination minimizes}
insertion and return losses, reduces component count and
minimizes board space
■ ^{7 kV ESD on LVDS I/O pins protects adjoining}
components
■ ^{Small 3 mm x 3 mm 8-LLP space saving package}
Applications
■ ^{Clock and data buffering}
■ ^{Metallic cable driving and equalization}
■ ^{FR-4 equalization}
Typical Application
© 2007 National Semiconductor Corporation 201791
20179110
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