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VSC7928 Datasheet Preview

VSC7928 Datasheet

SONET/SDH 3.2Gb/s Laser Diode Driver

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VSC7928 pdf
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
Features
Applications
• Rise Times Less Than 100ps
• High Speed Operation
(Up to 3.2Gb/s NRZ Data)
• Differential or Single-Ended Inputs
• SONET/SDH @ 622Mb/s, 1.244Gb/s,
2.488Gb/s, and 3.125Gb/s
• Full Speed Fibre Channel (1.062Gb/s)
• Single Supply
• ECL Compatible Clock and Data Inputs
• Direct Access to Modulation and Bias FETs
• Data Density Monitors
• On-chip Reclocking Register
• On-chip Mux for Clocked or Non-clocked Appli-
cations
• On-chip 50Input Termination: Clock and Data
• Enhanced Pinout
General Description
The VSC7928 is a single 5V supply, 3.2Gb/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 density outputs are provided to allow the user to adjust the laser bias
in high unbalanced data applications. Clock and data inputs are differentially terminated to 50.
VSC7928 Block Diagram
DIN
DINTERM*
NDIN
50 **
50 **
DQ
M
U
X
CLK
CLKTERM*
NCLK
50 **
50 **
*Terminated to Off-chip Capacitor
**On Die Components
SEL
MK
NMK
DCC
VIP
VIB
IMOD
IOUT
NIOUT
IBIAS
IBIAS
MIP MIB
G52246-0, Rev 3.0
04/05/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Page 1



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VSC7928 Datasheet Preview

VSC7928 Datasheet

SONET/SDH 3.2Gb/s Laser Diode Driver

No Preview Available !

VSC7928 pdf
VITESSE
SEMICONDUCTOR CORPORATION
SONET/SDH 3.2Gb/s Laser Diode Driver
Preliminary Data Sheet
VSC7928
Table 1: Signal Pin Reference
Signal
Type Level # Pins
DIN, NDIN
In ECL
2
MK, NMK
Out ECL
2
NIOUT
Out
1
IOUT
Out
1
VSS
GND
Pwr Pwr
2
Pwr Pwr 5/6(1)
VIP
In DC
1
MIP
In DC
1
VIB
In DC
1
MIB
In DC
1
IBIAS
Out DC
1
CLK, NCLK
In ECL
2
DINTERM
In DC
1
CLKTERM
In DC
1
DCC
In DC
1
SEL
GND/NC
Total Pins
In DC
1
Pwr DC
7(1)
— — 24/32*
NOTE: (1) Applicable to 32-pin TQFP package only.
Description
Data Input and Data Reference, On-chip 50Termination
Data Density Differential Outputs
Laser Modulation Current Output (Complementary)
Laser Modulation Current Output (To Laser Cathode)
Negative Voltage Rail
Positive Voltage Rail
Modulation Gate Node
Modulation Source Node
Bias Gate Node
Bias Source Node
Laser Bias Output (To Laser Cathode)
Clock Input and Clock Reference, On-chip 50Termination
Data Reference
Clock Reference
Duty Cycle Control, Leave Floating
Clk/Non-clk Data Select
No connection (leave floating or connect to GND)
Table 2: Mux Select Logic Table
SEL Mode Select
VSS
GND
N/C
Clocked Data In
Non-clocked Data In
Non-clocked Data In
Table 3: Absolute Maximum Ratings
Symbol
VSS
TJ
TSTG
Rating
Negative Power Supply Voltage
Maximum Junction Temperature
Storage Temperature
Limit
VCC to -6.0V
-55°C to + 125°C
-65°C to +150°C
Table 4: Recommended Operating Conditions
Symbol
Parameter
Min Typ Max Units
Conditions
GND
Positive Voltage Rail
0 V
VSS Negative Voltage Rail
TCl Operational Temperature(1)
TJ Junction Temperature
-5.5 -5.2 -4.9
V
-40 85(2) °C Power dissipation = 1.3W
— — 125 °C
NOTES: (1) Lower limit of specification is ambient temperature and upper limit is case temperature. (2) See section “Calculation of the
Maximum Case Temperature” for detailed maximum temperature calculations.
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
G52246-0, Rev 3.0
04/05/01


Part Number VSC7928
Description SONET/SDH 3.2Gb/s Laser Diode Driver
Maker ETC
Total Page 10 Pages
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