VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
SONET/SDH 2.5Gb/s Laser Diode Driver
VSC7923
Input Termination Schemes
Figure 1: Input Structure
OV (GND)
1400
4300
1400
X
X
DIN
• Nominal VREF = -1.3V
• 1400, 4300 Ohm Resistor
on die, nominal values
+
-
VREF
4300
-5.2V (VSS)
Figure 2: Single Ended AC Coupled
GND
0.1µF
DIN
X
SOURCE
50 Ohms
+
VREF
50Ω
GND
GND
-
X
0.1µF
-2V
VSS
GND
Figure 3: Differential AC Coupled
GND
0.1µF
DIN
X
+
-
SOURCE
0.1µF
GND
GND
GND
50Ω
X
VREF
-2V
GND
50Ω
-2V
VSS
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52203-0, Rev 3.0
05/11/01
Page 5
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
