ADN2841(2002) Просмотр технического описания (PDF) - Analog Devices
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ADN2841 Datasheet PDF : 12 Pages
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FEATURES
50 Mbps to 2.7 Gbps Operation
Typical Rise/Fall Time 80 ps
Bias Current Range 2 to 100 mA
Modulation Current Range 5 to 80 mA
Monitor Photodiode Current 50 A to 1200 A
Closed-Loop Control of Power and Extinction Ratio
Laser Fail and Laser Degrade Alarms
Automatic Laser Shutdown, ALS
Dual MPD Functionality for DWDM
Optional Clocked Data
Full Current Parameter Monitoring
5 V Operation
48-Lead LFCSP Package
32-Lead LFCSP Package (Reduced Functionality)
APPLICATIONS
DWDM Dual MPD Wavelength Fixing
SONET OC-1/3/12/48
SDH STM-1/4/16
Fibre Channel
Gigabit Ethernet
Dual-Loop 50 Mbps–2.7 Gbps
Laser Diode Driver
ADN2841
GENERAL DESCRIPTION
The ADN2841 uses a unique control algorithm to control both
the average power and extinction ratio of the laser diode (LD)
after initial factory setup. External component count and PCB area
are low, since both power and extinction ratio control are fully
integrated. Programmable alarms are provided for laser fail (end
of life) and laser degrade (impending fail).
The ADN2841 has circuitry for a second monitor photodiode,
which enables DWDM wavelength control.
FUNCTIONAL BLOCK DIAGRAM
VCC
MPD
IMPD
IMPD2
GND PSET
GND ERSET
GND
ERCAP
GND
VCC
IMODN
IMODP
VCC
LD
IMOD
CONTROL
IBIAS
PAVCAP
GND
IDTONE
ADN2841
LBWSET
DATAP
DATAN
CLKP
CLKN
IBIAS
ASET
GND
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
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