VSC8161 データシートの表示（PDF） - Vitesse Semiconductor

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VSC8161

2.488Gb/s SONET / SDH 16:1 Mux with Clock Generator and Laser Driver

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC8161

2.488Gb/s SONET / SDH

16:1 Mux with Clock Generator and Laser Driver

Figure 4: Recommended Modulation and Bias Current Control Circuits

+

VP

–

(0-60mV)

+

–

X VIP

X MIP

1Ω

VEE

Modulation Current Control Circuit

+

VB

–

(0-50mV)

+

–

X VIB

X MIB

1Ω

VEE

Bias Current Control Circuit

For Example to get 40mA of modulation current, VP is set to 40mV (40mA x 1Ω = 40mV)

Supplies

The VSC8161 is designed to operate with VEE = -5.2V, VTT = -2.0V and VCC = GND (0.0V). However, the

part can be operated in an all positive supply environment, or a mixed positive and negative supply environment.

To operate in an all positive supply environment, each of the supply voltages must be shifted up by 5.2V

such that VEE will now be GND, VTT = +3.2V and VCC = +5.2V. To operate in a mixed positive and negative

supply environment, each of the supply voltages must be shifted up by 2.0V such that VTT will now be GND,

VEE = -3.2V and VCC = +2.0V.

Bear in mind that termination voltages must be adjusted to reflect any shift in supply voltages.

G52208-0, Rev.2.1

8/28/98

© VITESSE SEMICONDUCTOR CORPORATION

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

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