參數(shù)資料
型號(hào)： VSC7938
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(qū)動(dòng)器，帶有自動(dòng)功率控制
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 213K
代理商： VSC7938
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)
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VSC7938R0 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Laser Diode Driver with Automatic Power Control
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
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