Datasheet

OUT+
OUT-
DS25CP102
Receiver
IN+
IN-
100: Differential T-Line
100:
LVDS
Driver
DS25CP102
www.ti.com SNLS262E –OCTOBER 2007–REVISED MARCH 2013
Functional Description
The DS25CP102 is a 3.125 Gbps 2x2 LVDS digital crosspoint switch optimized for high-speed signal routing and
switching over lossy FR-4 printed circuit board backplanes and balanced cables.
Table 1. Switch Configuration Truth Table
SEL1 SEL0 OUT1 OUT0
0 0 IN0 IN0
0 1 IN0 IN1
1 0 IN1 IN0
1 1 IN1 IN1
Table 2. Output Enable Truth Table
EN1 EN0 OUT1 OUT0
0 0 Disabled Disabled
0 1 Disabled Enabled
1 0 Enabled Disabled
1 1 Enabled Enabled
In addition, the DS25CP102 has a pre-emphasis control pin for switching the transmit pre-emphasis to ON and
OFF setting and an equalization control pin for switching the receive equalization to ON and OFF setting. The
following are the transmit pre-emphasis and receive equalization truth tables.
Table 3. Transmit Pre-Emphasis Truth Table
(1)
OUTPUTS OUT0 and OUT1
CONTROL Pin (PE) State Pre-Emphasis Level
0 OFF
1 ON
(1) Transmit Pre-Emphasis Level Selection
Table 4. Receive Equalization Truth Table
(1)
INPUTS IN0 and IN1
CONTROL Pin (EQ) State Equalization Level
0 OFF
1 ON
(1) Receive Equalization Level Selection
Input Interfacing
The DS25CP102 accepts differential signals and allows simple AC or DC coupling. With a wide common mode
range, the DS25CP102 can be DC-coupled with all common differential drivers (i.e. LVPECL, LVDS, CML). The
following three figures illustrate typical DC-coupled interface to common differential drivers. Note that the
DS25CP102 inputs are internally terminated with a 100Ω resistor.
Figure 10. Typical LVDS Driver DC-Coupled Interface to DS25CP102 Input
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Links: DS25CP102