Datasheet

OUT+
OUT-
DS25BR120
IN+
IN-
100: Differential T-Line
LVDS
50: MS
50: MS
50: MS
50: MS
L=1" L=1"
L=1"L=1"
L = A, B or C
100: Diff.
Stripline
DS25BR120
www.ti.com SNLS256E –MARCH 2007–REVISED APRIL 2013
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.
Test Channel Length Insertion Loss (dB)
(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 DS25BR120 accepts differential signals and allows simple AC or DC coupling. With a wide common mode
range, the DS25BR120 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
DS25BR120 inputs are internally terminated with a 100Ω resistor.
Figure 7. Typical LVDS Driver DC-Coupled Interface to DS25BR120 Input
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