VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7924
Table 5: Power Dissipation
Symbol
I
VSS
P
D
P
DMAX
SONET/SDH 2.5Gb/s Laser Diode Driver
Parameter
Power Supply Current (V
SS
)
Total Power Dissipation
Maximum Power Dissipation
Min
Typ
Max
220
1120
1815
Units
mA
mW
mW
Conditions
V
SS
= -5.5V, I
MOD
= I
BIAS
= 0mA
V
SS
= -5.5V, I
MOD
= I
BIAS
= 0mA,
R
LOAD
= 25Ω to GND
V
SS
= -5.5V, I
MOD
= 60mA,
I
BIAS
= 50mA, I
OUT
= 0V
Table 6: Laser Driver DC Electrical Specifications
Symbol
I
BIAS
I
MOD
V
IB
V
IP
V
OCM
Parameter
Programmable Laser Bias Current
Programmable Modulation Current
Laser Bias Control Voltage
Laser Modulation Control Voltage
Output Voltage Compliance
Min
2
2
Typ
Max
50
60
V
SS
+
2.1
V
SS
+
2.1
Units
mA
mA
V
V
V
Conditions
I
BIAS
= 50mA
I
MOD
= 60mA
V
SS
= -5.2V
GND
-2.2V
Table 7: Laser Driver AC Electrical Specifications
Symbol
t
R
, t
F
Parameter
Output Rise and Fall Times
Min
Typ
Max
100
Units
ps
Conditions
25Ω load, 20%-80%,
15mA < I
MOD
< 60mA,
I
BIAS
= 20mA
Table 8: Package Thermal Specifications
Symbol
θ
JCC
Parameter
Thermal Resistance from junction-to-case
Min
Typ
25
Max
Units
°C/W
Conditions
Ceramic Package
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
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