VITESSE

SEMICONDUCTOR CORPORATION

G52203-0, Rev 3.0

Page 5

05/11/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Preliminary Data Sheet

VSC7923

SONET/SDH 2.5Gb/s Laser Diode Driver

Input Termination Schemes

Figure 1: Input Structure

Figure 2: Single Ended AC Coupled

Figure 3: Differential AC Coupled

X

X

+

-

1400

1400

4300

4300

OV (GND)

-5.2V (VSS)

DIN

VREF

• Nominal VREF = -1.3V

• 1400, 4300 Ohm Resistor

on die, nominal values

X

X

SOURCE

50

Ω

50 Ohms

-2V

0.1

µF

0.1

µF

DIN

VREF

GND

VSS

+

-

GND

GND

GND

X

SOURCE

50

Ω

-2V

0.1

µF

DIN

X

50

Ω

-2V

0.1

µF

VREF

GND

VSS

+

-

GND

GND

GND

GND