VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7937
Features
• Typical Rise Times of 100ps
• High-Speed Operation
(Up to 2.5Gb/s NRZ Data)
• 3V Output Voltage Compliance
• Single-Ended or Differential Input Operation
• Single Power Supply: +5V or -5.2V
• Direct Access to Modulation and Bias FETs
• On-Die MUX for Clocked or Unclocked
Applications
• On-Chip 50
Ω
Input Clock and Data Termination
Single Supply 2.5Gb/s Voltage Driver
Applications
• SONET/SDH @ 622Mb/s, 1.244Gb/s, 2.488Gb/s
• Full-Speed Fibre Channel (1.062Gb/s)
General Description
The VSC7937 is a single -5.2V supply, 2.5Gb/s voltage driver with direct access to the output modulation
and bias FETs. The output stage can drive 60mA into 50
Ω
with adequate output voltage compliance. Output
bias and modulation currents are set by external components allowing precision monitoring and setting of the
output voltage levels.
VSC7937 Block Diagram
NOUT OUT
I
NOUT
DIN
50
Ω
**
DINTERM*
50
Ω
**
NDIN
D Q
M
U
X
IBIAS1
IMOD
IBIAS2
VIP
CLK
50
Ω
**
CLKTERM*
NCLK
MIB2
SEL
SEL
MIP
MIB1
50
Ω
**
VIB2
VIB1
*Terminated to Off-chip Capacitor
**On Die Components
G52200-0, Rev 3.0
03/05/01
©
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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