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Электронный компонент: VSC7928

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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
G52246-0, Rev 3.0
Page 1
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
Features
Applications
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
Rise Times Less Than 100ps
High Speed Operation
(Up to 3.2Gb/s NRZ Data)
Differential or Single-Ended Inputs
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 50
Input Termination: Clock and Data
Enhanced Pinout
SONET/SDH @ 622Mb/s, 1.244Gb/s,
2.488Gb/s, and 3.125Gb/s
Full Speed Fibre Channel (1.062Gb/s)
MK
NMK
IBIAS
NIOUT
IOUT
MIP
VIP
VIB
MIB
DCC
*Terminated to Off-chip Capacitor
**On Die Components
I
MOD
I
BIAS
M
U
X
SEL
DIN
DINTERM*
50
D Q
**
50
**
NDIN
CLK
50
**
50
**
NCLK
CLKTERM*
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
Page 2
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
Table 1: Signal Pin Reference
Table 2: Mux Select Logic Table
Table 3: Absolute Maximum Ratings
Table 4: Recommended Operating Conditions
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.
Signal
Type
Level
# Pins
Description
DIN, NDIN
In
ECL
2
Data Input and Data Reference, On-chip 50
Termination
MK, NMK
Out
ECL
2
Data Density Differential Outputs
NIOUT
Out
--
1
Laser Modulation Current Output (Complementary)
IOUT
Out
--
1
Laser Modulation Current Output (To Laser Cathode)
VSS
Pwr
Pwr
2
Negative Voltage Rail
GND
Pwr
Pwr
5/6
(1)
Positive Voltage Rail
VIP
In
DC
1
Modulation Gate Node
MIP
In
DC
1
Modulation Source Node
VIB
In
DC
1
Bias Gate Node
MIB
In
DC
1
Bias Source Node
IBIAS
Out
DC
1
Laser Bias Output (To Laser Cathode)
CLK, NCLK
In
ECL
2
Clock Input and Clock Reference, On-chip 50
Termination
DINTERM
In
DC
1
Data Reference
CLKTERM
In
DC
1
Clock Reference
DCC
In
DC
1
Duty Cycle Control, Leave Floating
SEL
In
DC
1
Clk/Non-clk Data Select
GND/NC
Pwr
DC
7
(1)
No connection (leave floating or connect to GND)
Total Pins
--
--
24/32
*
NOTE: (1) Applicable to 32-pin TQFP package only.
SEL
Mode Select
V
SS
Clocked Data In
GND
Non-clocked Data In
N/C
Non-clocked Data In
Symbol
Rating
Limit
V
SS
Negative Power Supply Voltage
V
CC
to -6.0V
T
J
Maximum Junction Temperature
-55C to + 125C
T
STG
Storage Temperature
-65C to +150C
Symbol
Parameter
Min
Typ
Max
Units
Conditions
GND
Positive Voltage Rail
--
0
--
V
VSS
Negative Voltage Rail
-5.5
-5.2
-4.9
V
T
Cl
Operational Temperature
(1)
-40
--
85
(2)
C
Power dissipation = 1.3W
T
J
Junction Temperature
--
--
125
C
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
G52246-0, Rev 3.0
Page 3
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
Table 5: High Speed Inputs and ECL Outputs
Table 6: Power Dissipation
Table 7: Laser Driver DC Electrical Specifications
Table 8: Laser Driver AC Electrical Specifications
Symbol
Parameter
Min
Typ
Max
Units
Conditions
V
IN
Single-ended Input Voltage Swing
300
--
1500
mVp-p
V
CM
= -2.0V
V
CM
Differential Input Common Mode Range
-2.3
--
-1.3
V
V
SS
= -5.2V
V
OH
ECL Output High Voltage
-1200
--
--
mV
50
to -2.0V
V
OL
ECL Output Low Voltage
--
--
-1600
mV
50
to -2.0V
V
IN
On-Chip Terminations
35
--
65
Symbol
Parameter
Min
Typ
Max
Units
Conditions
I
VSS
Power Supply Current (VSS)
--
80
120
mA
V
SS
= -5.5V, I
MOD
= I
BIAS
=
0mA, MK/NMK open circuit
P
D
Total Power Dissipation
--
--
700
mW
V
SS
= -5.5V, I
MOD
= I
BIAS
=
0mA, R
LOAD
= 25
to GND,
MK/NMK terminated 50
to -2V
Symbol
Parameter
Min
Typ
Max
Units
Conditions
I
BIAS
Programmable Laser Bias Current
2
--
100
mA
I
MOD
Programmable Modulation Current
2
--
100
mA
V
IB
Laser Bias Control Voltage
--
--
V
SS
+
2.1
V
I
BIAS
= 50mA
V
IP
Laser Modulation Control Voltage
--
--
V
SS
+
2.1
V
I
MOD
= 60mA
V
OCM
Output Voltage Compliance
--
GND -
3V
--
V
V
SS
= -5.2V
Symbol
Parameter
Min
Typ
Max
Units
Conditions
t
R
, t
F
Output Rise and Fall Times
--
--
100
ps
25
load, 20%-80%,
20mA < I
MOD
< 60mA,
I
BIAS
= 60mA
t
SU
Data to Clock Setup Time
--
50
90
ps
--
t
H
Hold Time
20
50
--
ps
--
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
Page 4
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
Figure 1: On-Chip Data and Clock Input Configuration
Figure 2: Single-Ended Operation
(NCLK)
NDIN
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
VSS
GND
GND
50
50
4.0K
6.4K
DINTERM to -2.0V for Differential ECL Inputs
DATA BUFFER
(CLOCK BUFFER)
X
X
X
*
*
*
*
*On-chip
Components
0.1f
0.1f
0.1f
0.1f
GND
NCLK
CLK
NDIN
DINTERM
DIN
7928
DATA
SOURCE
CLOCK
SOURCE
GND
GND
CLKTERM
GND
0.1f
0.1f
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7928
SONET/SDH 3.2Gb/s Laser Diode Driver
G52246-0, Rev 3.0
Page 5
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
Figure 3: Single-Ended AC-Coupled
Figure 4: Differential AC-Coupled
Figure 5: Differential DC-Coupled
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
GND
50
-2.0V
50
4.0K
6.4K
SOURCE
0.1
f
0.1
f
GND
0.1
f
GND
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
GND
50
-2.0V
50
4.0K
6.4K
SOURCE
0.1
f
0.1
f
GND
0.1
f
X
X
(NCLK)
NDIN
X
(CLKTERM)
DINTERM
(CLK)
DIN
VSS
-2.0V
GND
50
-2.0V
50
4.0K
6.4K
SOURCE