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Электронный компонент: VSC7927

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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, 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
General Description
The VSC7927 is a single 5V supply, 2.5 Gb/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
.
Applications
SDH/SONET @ 622Mb/s, 1.244Gb/s, 2.488Gb/s
Full Speed Fibre Channel (1.062Gb/s)
VSC7927 Block Diagram
Rise Times of Less Than 100ps
High Speed Operation
(Up to 2.5 Gb/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
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
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 2
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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
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
Total Pins
--
--
24
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
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, 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
Table 9: Package Thermal 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)
--
--
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
--
Symbol
Parameter
Min
Typ
Max
Units
Conditions
JCC
Thermal Resistance from Junction-to-Case
--
25
--
C/W
Ceramic Package
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 4
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Calculation of the Maximum Case Temperature
The VSC7927 is designed to operate with a maximum junction temperature of 125C. The rise from the
case to junction is determined by the power dissipation of the device. The power dissipation is determined by
the V
SS
current plus the operating I
MOD
and I
BIAS
currents.
The power of the chip is determined by the following formula:
P
D
= (-V
SS
* I
SS
) + ((V
IOUT
V
SS
) * I
MOD
) + ((V
IBIAS
V
SS
) * I
BIAS
)
For example with:
V
SS
=
-5.2V
I
MOD
=
40mA
I
BIAS
=
20mA
V
IBIAS
=
-2.0V
V
IOUT
=
-2.0V
P
D
=
(-5.2 * 150mA) + ((5.2 - 2.0) * 40mA) + ((5.2
-
- 2.0) * 20mA)
P
D
=
780mW + 128mW + 64mW = 972mW
The thermal rise from junction-to-case is
JC
* P
D
. For the ceramic package,
JCP
= 25C/W. Thus the ther-
mal rise is:
25C/W * 972W = 24.3C
The maximum case temperature is:
125C 24.3C = 100.7C
The absolute maximum power dissipation of the device is at:
V
SS
=
-5.5V
I
MOD
=
60mA
I
BIAS
=
50mA
V
IBIAS
=
0V
V
IOUT
=
0V
P
D
=
(5.5 * 150mA) + (5.5 * 60mA) + (5.5mA * 50mA)
P
D
=
1.43W
This will net a maximum junction to case thermal rise of: 1.43W * 25C/W = 35.8C
This situation will allow maximum case temperature of: 35.8C 58C = 89.2C
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, 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 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
0.1
f
0.1
f
0.1
f
0.1
f
GND
NCLK
CLK
NDIN
DINTERM
DIN
7927
DATA
SOURCE
CLOCK
SOURCE
GND
GND
CLKTERM
GND
0.1
f
0.1
f
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 6
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, Rev 3.0
Page 7
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 6: Control Signals VIP and VIB
Figure 7: Simplified Output Structure
30 mA
60 mA
I (MIB)
I (MIP)
VIP
VIB
VSS + 1.5 Volts (Typical)
VSS + 1.5 Volts (Typical)
Typical Bias Current v.s. Bias Voltage
Typical Modulation Current v.s. Modulation Voltage
X
X
X
X
X
X
NIOUT
IOUT
X
IBIAS
OUTPUT
DIFF
PAIR
VIB
MIB
MIP
VIP
I
MOD
I
BIAS
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 8
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Figure 8: Pad Assignments for VSC7927 Die
PAD 25
PAD 24
PAD 23
PAD 22
PAD 21
PAD 20
PAD 19
PAD 18
VIB
GND
IOUT
IOUT
GND
GND
NIOUT
IBIAS
PAD 1
PAD 34 PAD 33 PAD 32 PAD 31 PAD 30 PAD 29 PAD 28 PAD 27 PAD 26
DCC
VSS
VSS
VSS
VSS
VIP
MIP
MIP
MIB
PAD 2
PAD 3
PAD 4
PAD 5
PAD 6
PAD 7
PAD 8
N/C
NDIN
DIN
DINT
CLOCKT
CLOCK
NCLOCK
N/C
PAD 9
PAD 10
PAD 11
PAD 12 PAD 13 PAD 14 PAD 15 PAD 16 PAD 17
SEL
GND
GND
GND
GND
GND
GND
NMARK
MARK
120
m
120
150
m
30
m
1720
m
1620
m
1720
m
1620
m
50
m
50
m
50
m
50
m
Die Size:
1620m x 1620m
Actual Die Size: 1720mx1720m (after the die are cut up)
Pad Size:
120m x 120m
Pad Pitch:
150m
Space
Between Pads:
30m
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, Rev 3.0
Page 9
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
Pin Diagram for 24-Pin Ceramic Package
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
24
23
22
21
20
19
NDIN
DIN
DINTERM
CLKTERM
CLK
NCLK
VIB
GND
IOUT
GND
NIOUT
IBIAS
SEL
GND
GND
GND
MK
MK
DCC
VSS
VSS
VIP
MIP
MIB
Note:
Package lid and bottom heat spreader are electrically
connected to GND within the package.
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 10
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Package Information - 24 Pin Ceramic Package (Formed Leads)
Top View
Side View
NOTES: Drawing not to scale.
Package #: 101-000-0 Issue #:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
24
23
22
21
20
19
INDEX
A
E
A
D
I
C
G
F
H
J
B
Key
mm
In
A
9.5
0.374
B
7.7
0.303
C
2.0
0.079
D
1.27
0.050
E
0.30
0.012
F
1.7
0.067
G
0.6
0.024
H
11.5
0.453
I
0.125
0.005
J
8.51
0.335
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
G52201-0, Rev 3.0
Page 11
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
Package Information - 24 Pin Ceramic Package (Straight Leads)
Top View
Side View
NOTES: Drawing not to scale.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
24
23
22
21
20
19
INDEX
A
E
A
D
I
B
H
C
C
F
G
Key
mm
In
A
9.5
0.374
B
7.7
0.303
C
5.8
.230
D
1.27
0.050
E
0.30
0.012
F
1.7
0.067
G
0.6
0.024
H
9.53
0.375
I
0.125
0.005
J
8.51
0.335
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 12
G52201-0, Rev 3.0
04/05/01/01
VITESSE
SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Ordering Information
The order number for this product is formed by a combination of the device number, and package style.
Notice
Vitesse Semiconductor Corporation ("Vitesse") provides this document for informational purposes only. This document contains pre-production
information about Vitesse products in their concept, development and/or testing phase. All information in this document, including descriptions of
features, functions, performance, technical specifications and availability, is subject to change without notice at any time. Nothing contained in this
document shall be construed as extending any warranty or promise, express or implied, that any Vitesse product will be available as described or
will be suitable for or will accomplish any particular task.
Vitesse products are not intended for use in life support appliances, devices or systems. Use of a Vitesse product in such applications without writ-
ten consent is prohibited.
VSC7927
XX
Device Type
VSC7927: 2.5Gb/s Laser Diode Driver
Package Style
KF: (Ceramic - Straight Leads)
KFL: (Ceramic- Formed Leads)
KFRL: (Ceramic - Reversed Formed Leads}*
*Optional Reversed Formed Leads: Package leads have the same profile and dimensions,
but heat spreader is away from board. Please contact the factory for additional information.
X : (Bare Die)