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.

OUTPUTS OUT0 and OUT1

CONTROL Pin (PE) State

Pre-Emphasis Level

0

OFF

1

ON

(1)

Transmit Pre-Emphasis Level Selection

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 100

Ω resistor.

Figure 10. Typical LVDS Driver DC-Coupled Interface to DS25CP102 Input

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