Data Sheet

©2007-2013 Exar Corporation

16/18

Rev 1D

Line coupling through a 1:2 transformer is used to realize

these levels. Standard back termination is used to match

the characteristic 100Ω impedance of the CAT5 cable. For

proper power transfer, this requires an effective 1:4 im-

pedance match of 25Ω at the inputs of the transformer. To

account for the voltage drop of the impedance matching

resistors, the signal levels at the output of the amplifier

need to be doubled. Thus each amplifier will swing ±3.75V

about a centered common mode output voltage.

In general, the CLC2000/CLC4000 can be used in any ap-

plication where an economical and local hardwired con-

nection is needed. For example, routing analog or digital

video information for a in-cabin entertainment system.

Networking of a local surveillance system also could be

considered.

Layout Considerations

General layout and supply bypassing play major roles in

high frequency performance. Exar has evaluation boards

to use as a guide for high frequency layout and as aid in

device testing and characterization. Follow the steps below

as a basis for high frequency layout:

• Include 6.8µF and 0.1µF ceramic capacitors for power

supply decoupling

• Place the 6.8µF capacitor within 0.75 inches of the power pin

• Place the 0.1µF capacitor within 0.1 inches of the power pin

• Remove the ground plane under and around the part,

especially near the input and output pins to reduce para-

sitic capacitance

• Minimize all trace lengths to reduce series inductances

Refer to the evaluation board layouts below for more in-

formation.

Evaluation Board Information

The following evaluation board is available to aid in the

testing and layout of this device:

Products

CEB006

CLC2000

CEB018

CLC4000

Evalutaion Board Schematics

Evaluation board schematics and layouts are shown in Fig-

ures 7-9. These evaluation boards are built for dual- sup-

ply operation. Follow these steps to use the board in a

single-supply application:

1. Short -Vs to ground.

directly connected to the ground plane.

Figure 7. CEB006 Schematic

Figure 8. CEB006 Top View