VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
SONET/SDH 10.7Gb/s
Laser Diode Driver
VSC7990
Figure 3: Control Signals VIP and VIB
I (MIP)
I (MIB)
30mA
60mA
VIB
VIP
SS + 1.5V (typical)
V
SS + 1.5V (typical)
V
Typical Bias Current vs. Bias Voltage
Typical Modulation Current vs. Modulation Voltage
Figure 4: Simplified Output Structure
VDD
IBIAS
NIOUT IOUT
Output
Differential
Pair
VIP
IMOD
IBIAS
500Ω
VIB
MIP
MIB
300Ω
2.5kΩ
3Ω
2.5kΩ
3Ω
vSS
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
Page 6
G52303-0, Rev 2.2
04/05/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
