HFBR-5208AM 查看數據表（PDF） - HP => Agilent Technologies

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HFBR-5208AM

Agilent HFBR/HFCT-5208M 1 x 9 Fiber Optic Transceivers for 622 Mb/s ATM/SONET/SDH Applications

HP => Agilent Technologies 

Reference Design

Agilent has developed a reference

design for multimode and single-

mode OC-12 ATM-SONET/SDH

applications shown in Figure 6.

This reference design uses a

Vitesse Semiconductor Inc.’s

VSC8117 clock recovery/clock

generation/serializer/deserializer

integrated circuit and a PMC-

Sierra Inc. PM5355 framer IC.

Application Note 1178 documents

the design, layout, testing and

performance of this reference

design. Gerber files, schematic

and application note are available

from the Agilent Fiber-Optics

Components’ web site at the URL

of http://www.semiconductor.

agilent.com.

20.32

(0.800)

20.32

(0.800)

2.54

(0.100)

TOP VIEW

DIMENSIONS ARE IN MILLIMETERS (INCHES)

Figure 5. Recommended Board Layout Pattern

2 x Ø 1.9 ± 0.1

(0.075 ± 0.004)

9 x Ø 0.8 ± 0.1

(0.032 ± 0.004)

Operation in -5.2 V Designs

For applications that require

-5.2 V dc power supply level for

true ECL logic circuits, the

HFBR/HFCT-5208M transceiver

can be operated with a VCC = 0 V

dc and a VEE = -5.2 V dc. This

transceiver is not specified with

an operating, negative power

supply voltage. The potential

compromises that can occur with

use of -5.2 V dc power are that the

absolute voltage states for VOH

and VOL will be changed slightly

due to the 0.2 V difference in

supply levels. Also, noise

immunity may be compromised

for the HFBR/HFCT-5208M trans-

ceiver because the ground plane is

now the VCC supply point. The

suggested power supply filter

circuit shown in the Recommended

Circuit Schematic figure should be

located in the VEE paths at the

transceiver supply pins. Direct

coupling of the differential data

signal can be done between the

HFBR-5208M transceiver and the

standard ECL circuits. For

guaranteed -5.2 V dc operation,

contact your local Agilent

Component Field Sales Engineer

for assistance.

Figure 6. 622.08 Mb/s OC-12 ATM-SONET/SDH Reference Design Board

Electromagnetic Interference (EMI)

One of a circuit board designer’s

foremost concerns is the control

of electromagnetic emissions

from electronic equipment.

Success in controlling generated

Electromagnetic Interference

(EMI) enables the designer to pass

a governmental agency’s EMI

regulatory standard; and more

importantly, it reduces the

possibility of interference to

neighboring equipment. There are

three options available for the

HFBR/HFCT-5208M with regard to

EMI shielding for providing the

designer with a means to achieve

good EMI performance. The EMI

performance of an enclosure

using these transceivers is

dependent on the chassis design.

Agilent encourages using standard

RF suppression practices and

avoiding poorly EMI-sealed

enclosures. In addition, Agilent

advises that for the best EMI

performance, the metalized case

must be connected to chassis

ground using one of the shield

options.

5

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