OUT+

OUT-

DS25BR110

IN+

IN-

100: Differential T-Line

LVDS

L=1"

L=1"

L=1"

L=1"

L = A, B or C

100: Differential

Stripline

50:

Microstrip

50:

Microstrip

50:

Microstrip

50:

Microstrip

DS25BR110

SNLS255E – MARCH 2007 – REVISED APRIL 2013

www.ti.com

Figure 6. Test Channel Description

Test Channel Loss Characteristics

The test channel was fabricated with Polyclad PCL-FR-370-Laminate/PCL-FRP-370 Prepreg materials (Dielectric

constant of 3.7 and Loss Tangent of 0.02). The edge coupled differential striplines have the following geometries:

Trace Width (W) = 5 mils, Gap (S) = 5 mils, Height (B) = 16 mils.

Insertion Loss (dB)

Length

Test Channel

(inches)

500 MHz

750 MHz

1000 MHz

1250 MHz

1500 MHz

1560 MHz

A

10

-1.2

-1.7

-2.0

-2.4

-2.7

-2.8

B

20

-2.6

-3.5

-4.1

-4.8

-5.5

-5.6

C

30

-4.3

-5.7

-7.0

-8.2

-9.4

-9.7

D

15

-1.6

-2.2

-2.7

-3.2

-3.7

-3.8

E

30

-3.4

-4.5

-5.6

-6.6

-7.7

-7.9

F

60

-7.8

-10.3

-12.4

-14.5

-16.6

-17.0

Device Operation

INPUT INTERFACING

The DS25BR110 accepts differential signals and allows simple AC or DC coupling. With a wide common mode

range, the DS25BR110 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

DS25BR110 inputs are internally terminated with a 100

Ω resistor.

Figure 7. Typical LVDS Driver DC-Coupled Interface to DS25BR110 Input

8

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