1 Features

1• 2:1 Multiplexer and 1:2 Buffer

• 0.25-Gbps to 2.5-Gbps Fully Differential Data

Paths

• Fixed Input Equalization

• Programmable Output Pre-Emphasis

• Independent Pre-Emphasis Controls

• Programmable Loopback Modes

• On-Chip Terminations

• ESD Rating of 6-kV HBM

• 3.3-V Supply

• Low power, 0.45 W Typical

• Lead-Less WQFN-36 Package

• −40°C to +85°C Operating Temperature Range

2 Applications

• Backplane Drivers or Cable Driver

• Redundancy and Signal Conditioning Applications

• CPRI/OBSAI

3 Description

The DS25MB100 device 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 include continuous time

linear equalization (CTLE) and programmable output

pre-emphasis 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 selectable levels of preemphasis

to compensate for transmission losses from

long FR4 backplane or cable attenuation reducing

deterministic jitter. The pre-emphasis levels can be

independently controlled for the line-side and switchside

drivers. The internal loopback paths from switchside

input to switch-side output enable at-speed

system testing. All receiver inputs are internally

terminated with 100-Ω differential terminating

resistors. All driver outputs are internally terminated

with 50-Ω terminating resistors to VCC.