VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7924
Features
• Rise Times Less Than 100ps
• High-Speed Operation
(Up to 2.5Gb/s NRZ Data)
• Single-Ended Operation
• Single Power Supply
• Direct Access to Modulation and Bias FETs
• Data Density Monitors
• 24-Pin Ceramic Package
SONET/SDH 2.5Gb/s Laser Diode Driver
Applications
• SONET/SDH at 622Mb/s, 1.244Gb/s, and 2.488Gb/s
• Full-Speed Fibre Channel (1.062Gb/s)
General Description
The VSC7924 is a single 5V supply, 2.5Gb/s laser diode driver with direct access to the laser modulation
and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitor-
ing and setting of the current levels. Data inputs accept ECL levels. Data density outputs are provided to allow
the user to adjust the laser bias in high unbalanced data applications.
VSC7924 Block Diagram
IOUT
NIOUT
MK
NMK
DIN
VREF
IMOD
VIP
*TERM
VIB
MIP
MIB
IBIAS
*Terminated to Off-chip Capacitor
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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VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
