VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7924
Input Termination Schemes
SONET/SDH 2.5Gb/s Laser Diode Driver
Figure 1: Input Structure
OV (GND)
1.4k
Ω
1400
1.4k
Ω
1400
DIN
X
VREF
X
TERM
X
12
p
F
3Ω
4.3k
Ω
4300
4.3k
Ω
4300
+
-
• Nominal VREF = -1.3V
• 1400, 4300 Ohm Resistor
on die, nominal values
Nominal V
REF
= 1.3V
1.4kΩ, 4.3kΩ resistor on die, nominal values
GND -5.2V (VSS)
Figure 2: Single-Ended AC Coupled
GND
0.1µF
SOURCE
50Ω
-2V
GND
DIN
X
TERM or VREF
+
X
0.1µF
VSS
-
Figure 3: Single Ended AC Coupled with Offset Adjust
GND
0.1µf
SOURCE
50Ω
DIN
X
VREF
+
-
X
GND
3 VSS
2000
2kΩ
X
TERM
0.1µf
GND
Page 5
4.3kΩ
4300
VSS
G52156-0, Rev 3.0
05/01/01
©
VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
