AM7968-125JC datasheet(70/127 Pages) AMD

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TAXIchip Integrated Circuits Technical Manual

5.5 Interfacing to Fiber Optic Transmitters/Receivers

The TAXlchip set can be used in conjunction with optical components and optical fiber

to form a simple fiber optic communication link. Optical transmission has many advan-

tages over conventional electrical transmission. These include: immunity to EMI/RFI,

low attenuation, electrical isolation, data security, and wide bandwidth. Because of these

features, use of optical fiber as the serial media will result in optimum performance of

the TAXIchip set link. Depending on the type of fiber and the optical components used,

TAXI links using optical fiber can cover distances of up to several kilometers.

Figure 5-6 shows a block diagram of a complete TAXI fiber optic link. The optical

components transmitters and receivers can be obtained from one of the sources listed in

Appendix A of this manual. The interface between the TAXlchips and the optical

components will be the subject of this section.

Figure 5-6

TAXl-Based Fiber Optic Link

Optical

Detector:

PIN or

Avalanche

Photodiode

12330E-13

Optical

Source:

LED or

Laser Diode

Source

Driver

Electronics

Fiber Optic Transmitter

Am7968

Transmitter

Fiber

Optic

Cable

Receiver

Electronics

Fiber Optic Receiver

Am7969

Receiver

TAXI /Optical

Interface

Data

Command

Optical

Connectors

Transceiver

Data

Command

5.5.1 DC-Coupled TAXl-Fiber Optic Transceiver Interface

When passing data between the TAXIchip set and an optical module, care must be

taken to assure that the logic levels of the TAXIchip set and the optical components are

matched. If the supply voltages of the optical components do not match those of the

TAXIchip set, then the logic levels will probably differ and the interface will require AC

coupling to isolate these different levels. However, if the power supply requirements

match those of the TAXIchip set (i.e. VCC = +5 V, VEE = GND) and if the two components

are connected to the same power and ground planes, a DC coupled interconnection

may be sufficient.

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