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DS25MB100 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer DS25MB100
Beschreibung 2.5 Gbps 2:1/1:2 CML Mux/Buffer
Hersteller National Semiconductor
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Gesamt 16 Seiten
DS25MB100 Datasheet, Funktion
December 6, 2007
DS25MB100
2.5 Gbps 2:1/1:2 CML Mux/Buffer with Transmit De-
Emphasis and Receive Equalization
General Description
The DS25MB100 is a signal conditioning 2:1 multiplexer and
1:2 fan-out buffer designed for use in backplane redundancy
or cable driving applications. Signal conditioning features in-
clude input equalization and programmable output de-em-
phasis that enable data communication in FR4 backplane up
to 2.5 Gbps. Each input stage has a fixed equalizer to reduce
ISI distortion from board traces. All output drivers have four
www.DsaetlaecSthaebelet4lUe.vceolsmof de-emphasis to compensate for trans-
mission losses from long FR4 backplane or cable attenuation
reducing deterministic jitter. The de-emphasis levels can be
independently controlled for the line-side and switch-side
drivers. The internal loopback paths from switch-side input to
switch-side output enable at-speed system testing. All receiv-
er inputs and driver outputs are internally terminated with
100differential terminating resistors.
Features
2:1 multiplexer and 1:2 buffer
0.25–2.5 Gbps fully differential data paths
Fixed input equalization
Programmable output de-emphasis
Independent de-emphasis controls
Programmable loopback modes
On-chip terminations
HBM ESD rating 5.5 kV on all pins
+3.3V supply
Low power, 0.45 W typical
Lead-less LLP-36 package
−40°C to +85°C operating temperature range
Applications
Backplane or cable driver
Redundancy and signal conditioning applications
CPRI/OBSAI
Functional Block Diagram
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DS25MB100 Datasheet, Funktion
20208904
FIGURE 1. Driver De-Emphasis Differential Waveform (Showing All 4 De-Emphasis Steps)
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DS25MB100 pdf, datenblatt
Application Information
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FIGURE 6. Application Diagram
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