AM7968-125JC datasheet(74/127 Pages) AMD

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AMD

TAXIchip Integrated Circuits Technical Manual

Sample Values

Using RG-58A/U, 50

Ω coaxial cable, a successful TAXI link was established using the

following component values:

R1 = 68

Ω

R2 = 200

Ω

RE = 300

Ω

= 0.1

µF

5.7 Interfacing to Twisted-Pair Cable

Another low cost alternative twisted pair cable. Twisted pair cable is generally more

lossy than coaxial cable making it suitable only for short distances. To reduce the

possibility of noise being induced along the line, the shielded twisted-pair cable is

recommended.

Using the TAXlchip set with shielded-twisted-pair as the serial medium is very similar to

using it with coaxial cable. The recommended configuration is shown in Figure 5-11,

where each of the components that make up the interface serve the same purpose as in

the AC-coupled TAXl-fiber optic interface shown in Figure 5-9.

Note that with shielded-twisted-pair, only one cable is required to form the link. The

twisted-pair conductors carry the differential pseudo-ECL signals and the shield is

grounded at the Receiver.

Figure 5-11

Shielded-Twisted Pair Cable Interface

12330E-18

L, Z0

+5 V

–

+5 V

R1R2

R1+ R2

= Z0/2

5R2

R1+ R2

= 3.7 V

Midpoint of Pseudo

ECL Signal Swing

186

≤ RE ≤ 7.2 (Z0)

C = Largest RF Capacitor Available

TAXI

AM7968-125JC Datenblatt(PDF) 74 Page - Advanced Micro Devices

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