VSC8117QP2 查看數據表（PDF） - Vitesse Semiconductor

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VSC8117QP2

ATM/SONET/SDH 622/155 Mb/s Transceiver Mux/Demux with Integrated Clock Generation and Clock Recovery

Vitesse Semiconductor 

Data Sheet

VSC8117

VITESSE

SEMICONDUCTOR CORPORATION

ATM/SONET/SDH 622/155 Mb/s Transceiver Mux/Demux

with Integrated Clock Generation and Clock Recovery

Ground Planes

The ground plane for the components used in the High Speed interface should be continuous and not sec-

tioned in an attempt to provide isolation to various components. Sectioning of the ground planes tends to inter-

fere with the ground return currents on the signal lines. In addition, the smaller the ground planes the less

effective they are in reducing ground bounce noise and the more difficult to decouple. Sectioning of the positive

supplies can provide some isolation benefits.

Figure 12: AC Coupled High Speed I/O

DRIVER

(Optics Module)

PC Board Trace

+3.3V

C1

VSC8117

PECL I/O

+5.0V RECEIVER

(Optics Module)

PC Board Trace C2 R3

R1

GND

R2

GND

GND

Note: Only one side of a differential signal is shown.

R4

GND

Table 17: AC Coupling Component Values

Component

R1

R2

R3

R4

C1, C2, C3, C4

Value

270 ohms

75 ohms

68 ohms

190 ohms

.01uf High Frequency

Tolerance

5%

5%

1%

1%

G52221-0, Rev. 4.1

1/8/00

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

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