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Teilenummer | DS25MB100 |
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Beschreibung | 2.5 Gbps 2:1/1:2 CML Mux/Buffer | |
Hersteller | National Semiconductor | |
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Gesamt 16 Seiten 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
100Ω differential 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
© 2007 National Semiconductor Corporation 202089
20208901
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20208904
FIGURE 1. Driver De-Emphasis Differential Waveform (Showing All 4 De-Emphasis Steps)
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6 Page Application Information
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FIGURE 6. Application Diagram
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12 Page | ||
Seiten | Gesamt 16 Seiten | |
PDF Download | [ DS25MB100 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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DS25MB100 | 2.5 Gbps 2:1/1:2 CML Mux/Buffer | National Semiconductor |
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