VITESSE
SEMICONDUCTOR CORPORATION
SDH/SONET 10.7Gb/s
Electroabsorption Modulator/Laser Diode Driver
Advance Product Information
VSC7991
AC Characteristics
(Over recommended operating conditions)
Table 1: High Speed Inputs /Outputs
Symbol
IRL
ORL
Parameter
Input Return Loss
,
50Ω System
Output Return Loss, 50Ω System
Min
Typ
−15
−12
Max
Units
dB
dB
Conditions
50MHz to 10GHz
50MHz to 10GHz
Table 2: Laser Driver AC Electrical Specifications
Symbol
t
R
t
F
Jitter
Parameter
Output Rise and Fall Times
Output Jitter
Overshoot/Undershoot
Duty-Cycle
Min
Typ
Max
38
15
+10
+25
Units
ps
ps/p-p
%
%
Conditions
50Ω load, 20% to 80%, V
MOD
= 3V
50Ω Load, V
MOD
= 3V
DCC in the range of V
SS
−
0.5V to V
SS
+2V
−10
−25
DC Characteristics
(Over recommended operating conditions)
Table 3: Power Dissipation
Symbol
I
VSS
P
D
Parameter
Power Supply Current (V
SS
)
Total Power Dissipation
Min
Typ
300
2040
Max
330
2244
Units
mA
mW
Conditions
V
SS
=
−6.8,
R
L
= 50Ω to GND,
I
MOD
= 120mA, V
BIAS
= 0V
V
SS
=
−6.8,
R
L
= 50Ω to GND
I
MOD
= 120mA, V
BIAS
= 0V
Table 4: Laser Driver DC Electrical Specifications
Symbol
V
BIAS
V
MOD
V
OCM
IB, IBN
V
IP
V
IH
V
IL
V
SW(1)
DCC
Parameter
Programmable Output Offset Voltage
Modulation Voltage Amplitude
Output Voltage Compliance
Laser Bias Control Voltage
Laser Modulation Control Voltage
Input High Voltage
Input Low Voltage
Input Voltage Swing
Duty-Cycle Control
Min
−0.8
1.5
Typ
Max
0
3
0
V
SS
+
0.7
0
−0.60
1000
V
SS
+
2V
Units
V
V
V
V
V
mV
V
mVp-p
Conditions
−10
V
SS
−150
−1.00
450
V
SS
−
0.5V
4
NOTE: DIN and NDIN inputs need to be driven differentially. If single-ended drive is desired, it is necessary to add a DC bias to the unused pin.
Page 2
©
VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52321-0, Rev 2.3
02/26/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
