VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
SONET/SDH 2.5Gb/s Laser Diode Driver
VSC7925
Figure 1: Laser Driver Maximum Case Temperature vs. Modulation Current
CASE TEMPERATURE vs. MODULATION CURRENT
90
80
Case Temperature (
o
C)
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
Modulation Current (mA)
70
80
Figure 2: Clock and Data Input Structure
X
0V (GND)
DIN
(CLK)
X
50
50Ω
2000
2kΩ
VREF
3
10pF
2000
2kΩ
+
-
NDIN
(NCLK)
X
•Nominal VREF Value = -2.5V
•All Values Nominal
X
0V (GND)
X
-5.2V(VSS)
Figure 3: Single-Ended Operation
7925
VSC7925
DIN
NDIN
0.1µf
DATA
SOURCE
0.1µf
CLOCK
SOURCE
0.1µf
GND
CLK
NCLK
0.1µf
GND
Page 4
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VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52157-0, Rev 3.2
05/01/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
