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PDF VSC7938 Data sheet ( Hoja de datos )

Número de pieza VSC7938
Descripción Laser Diode Driver
Fabricantes Vitesse Semiconductor　
Logotipo Vitesse Semiconductor Logotipo



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No Preview Available ! VSC7938 Hoja de datos, Descripción, Manual

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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7938
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Features
• Power Supply: 3.3V or 5V ±5%
• AC-Coupled to Laser Diode
• Programmable Modulation Current: 5mA to 60mA
• Programmable Bias Current: 1mA to 100mA
• Enable/Disable Control
• Typical Rise/Fall Times of 60ps
• Automatic Optical Average Power Control
• Supply Current of 33mA at 3.3V
Applications
• SDH/SONET at 622Mb/s, 1.244Gb/s,
2.488Gb/s, 3.125Gb/s
• Full-Speed Fibre Channel (1.062Gb/s)
General Description
The VSC7938 is a single 3.3V or 5V supply laser diode driver specially designed for SDH/SONET applica-
tions 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 con-
trolled with an external capacitor. Other features include enable/disable control, short-circuit protection for the
modulation and bias inputs, short rise and fall times, 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 optical power. The
VSC7938 is available in die form or in a 48-pin TQFP package.
Block Diagram
3.3V Operation
LATCH
VCC
DATA+
DATA-
CLK+
CLK-
MUX
SET
DQ
CLR Q
IOUT+
IOUT-
CD
BIAS
VCC
CF
RF
ENABLE
DISABLE
APC
MD
FAIL
SLWSTRT MODSET BIASMAX CAPC APCSET
1nF
G52349-0, Rev 3.0
01/20/01
© 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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VSC7938 pdf
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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7938
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Table 4: Pad Coordinates
Signal
Name
GND2
GND1
VCC1
DATA+
DATA-
VCC1
GND1
VCC1
CLK+
CLK-
VCC1
GND1
LATCH
ENABLE
DISABLE
GND1
SLWSTRT
VCC1
FAIL
GND4
PB_GND
APCFILT
GND4
VCC4
Pad
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Coordinates (µm)
X
1613.55
1414.525
1289.525
1174.525
1059.525
944.525
829.525
714.525
599.525
484.525
369.525
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
Y
1863.475
2073.55
2073.55
2073.55
2073.55
2073.55
2073.55
2073.55
2073.55
2073.55
2073.55
1863.475
1748.475
1633.475
1518.475
1403.475
1288.475
1058.475
1058.475
828.475
828.475
598.475
598.475
483.475
Signal
Name
BIAS
PB_GND
VCC4
DB_OUT+
OUT+
OUT-
DB_OUT-
VCC4
GND4
GND3
MD
GND3
VCC3
CAPC
PB_GND
GND3
PB_GND
GND2
AUTSEL
APCSET
GND2
MODSET
BIASMAX
VCC2
Pad
Number
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Coordinates (µm)
X
159.45
369.525
484.525
599.525
714.525
829.525
944.525
1059.525
1174.525
1289.525
1404.525
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
1613.55
Y
368.475
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
159.45
368.475
483.475
598.475
713.475
828.475
943.475
1058.475
1173.475
1288.475
1403.475
1518.475
1633.475
1748.475
G52349-0, Rev 3.0
01/20/01
© 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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VSC7938 arduino
www.DataSheet4U.com
VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7938
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Typical Operating Characteristics
IMODSET vs. RMODSET
T=25°C VCC = 3.3V
IMODSET vs. RMODSET
T=25°C VCC = 5V
IBIASMAX vs. RBIASMAX
T=25°C, VCC = 3.3V
IBIASMAX vs. RBIASMAX
T=25°C, VCC = 5V
G52349-0, Rev 3.0
01/20/01
© 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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