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PDF VSC7940 Data sheet ( Hoja de datos )

Número de pieza VSC7940
Descripción SONET/SDH 3.125Gb/s Laser Diode Driver
Fabricantes Vitesse Semiconductor 
Logotipo Vitesse Semiconductor Logotipo



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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7940
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Features
• Power Supply: 5V ±5%
• DC-Coupled to Laser Diode
• Programmable Modulation Current: 5mA to 100mA
• Programmable Bias Current: 1mA to 100mA
• Enable/Disable Control
• Automatic Optical Average Power Control
• Modulation and Bias Current Monitors
Applications
SONET/SDH at 622Mb/s, 1.244Gb/s,
2.488Gb/s, 3.125Gb/s
Full-Speed Fibre Channel (1.062Gb/s)
General Description
The VSC7940 is a single 5V supply laser diode driver specially designed for SONET/SDH applications up
to 3.125Gb/s. External resistors set a wide range of bias and modulation currents for driving the laser. Data and
clock inputs accept differential PECL signals. The Automatic Power Control (APC) loop maintains a constant
average optical power over temperature and lifetime. The dominant pole of the APC loop can be controlled with
an external capacitor. Other features include enable/disable control, programmable slow-start circuit to set laser
turn-on delay, and failure-monitor output to indicate when the APC loop is unable to maintain the average opti-
cal power. The VSC7940 is available in die form or in a 32-pin TQFP package.
Block Diagram
VCC
DATA+
DATA-
CLK+
CLK-
ENABLE
DISABLE
L AT C H
SET
DQ
Q
CLR
MUX
APC
MODSET
BIASMAX
CAPC
APCSET
IOUT+
IOUT-
CF
RF
VCC
BIAS
VCC
MODMON
MD
FAIL
VCC
BIASMON
1nF
G52357-0, Rev 3.2
05/11/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected]
Internet: www.vitesse.com
Page 1

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VSC7940 pdf
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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7940
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Table 4: Pad Coordinates
Signal
Name
VCC1
DATA+
DATA-
VCC1
GND1
VCC1
CLK+
CLK-
VCC1
GND1
LATCH
ENABLE
DISABLE
GND1
BIASMON
MODMON
FAIL
GND4
PB_GND
APCFILT
GND4
VCC4
BIAS
PB_GND
Pad
No.
1 (Pin 1)
2 (Pin 2)
3 (Pin 3)
4 (Pin 4)
5
6
7 (Pin 5)
8 (Pin 6)
9 (Pin 7)
10
11 (Pin 8)
12 (Pin 9)
13 (Pin 10)
14
15 (Pin 11)
16 (Pin 12)
17 (Pin 13)
18
19
20 (Pin 14)
21 (Pin 15)
22 (Pin 16)
23 (Pin 17)
24
Coordinates (µm)
X
1211.025
1096.025
981.025
866.025
751.025
636.025
521.025
406.025
291.025
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
291.025
Y
1995.05
1995.05
1995.05
1995.05
1995.05
1995.05
1995.05
1995.05
1995.05
1784.975
1669.975
1554.975
1439.975
1324.975
1209.975
1094.975
979.975
864.975
749.975
634.975
519.975
404.975
289.975
80.95
Signal
Name
VCC4
DB_OUT+
OUT+
OUT
DB_OUT
VCC4
GND4
GND3
MD
GND3
VCC3
CAPC
PB_GND
GND3
PB_GND
GND2
RESERVED
APCSET
GND2
MODSET
BIASMAX
VCC2
GND2
GND1
Pad
No.
25 (Pin 18)
26
27 (Pin 19)
28 (Pin 20)
29
30 (Pin 21)
31 (Pin 22)
32 (Pin 23)
33 (Pin 24)
34
35 (Pin 25)
36 (Pin 26)
37
38 (Pin 27)
39
40
41 (Pin 28)
42 (Pin 29)
43
44 (Pin 30)
45 (Pin 31)
46 (Pin 32)
47
48
Coordinates (µm)
X
406.025
521.025
636.025
751.025
866.025
981.025
1096.025
1211.025
1326.025
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1535.05
1336.025
Y
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
80.95
289.975
404.975
519.975
634.975
749.975
864.975
979.975
1094.975
1209.975
1324.975
1439.975
1554.975
1669.975
1784.975
1995.05
G52357-0, Rev 3.2
05/11/01
© VITESSE SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: [email protected]
Internet: www.vitesse.com
Page 5

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VSC7940 arduino
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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7940
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Typical Operating Characteristics
IBIASMAX vs. RBIASMAX
T=25°C, VCC = 5V
IMOD vs. RMODSET
T=25°C VCC = 5V
IMD vs. RAPCSET,
T=25°C, VCC = 5V
G52357-0, Rev 3.2
05/11/01
© VITESSE SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: [email protected]
Internet: www.vitesse.com
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