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參數(shù)資料
| 型號： | VSC7938R0 |
| 廠商： | Vitesse Semiconductor Corporation. |
| 英文描述： | Laser Diode Driver with Automatic Power Control |
| 中文描述： | 激光二極管驅動器，帶有自動功率控制 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | VSC7938R0 |
VITESSE
Preliminary Data Sheet
VSC7938
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
G52349-0, Rev 3.0
01/20/01
Page 1
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 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
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
3.3V Operation
Q
SET
CLR
Q
D
MUX
DATA+
DATA-
CLK+
CLK-
APC
ENABLE
BIAS
IOUT+
IOUT-
MD
MODSET
BIASMAX
CAPC
APCSET
FAIL
LATCH
C
D
L
P
L
P
1nF
V
CC
V
CC
C
F
R
F
DISABLE
SLWSTRT
SDH/SONET at 622Mb/s, 1.244Gb/s,
2.488Gb/s, 3.125Gb/s
Full-Speed Fibre Channel (1.062Gb/s)
相關PDF資料 |
PDF描述 |
|---|---|
| VSC7938 | Laser Diode Driver with Automatic Power Control |
| VSC7938W | Laser Diode Driver with Automatic Power Control |
| VSC7939 | Laser Diode Driver with Automatic Power Control |
| VSC7939RP | Laser Diode Driver with Automatic Power Control |
| VSC7939W | Laser Diode Driver with Automatic Power Control |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| VSC7938W | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Laser Diode Driver with Automatic Power Control |
| VSC7939 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Laser Diode Driver with Automatic Power Control |
| VSC7939RP | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Laser Diode Driver with Automatic Power Control |
| VSC7939W | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Laser Diode Driver with Automatic Power Control |
| VSC7940 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control |
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