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ADN2525 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADN2525
Description  10.7 Gbps Active Back-Termination, Differential Laser Diode Driver
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADN2525 Datasheet(HTML) 1 Page - Analog Devices

 
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10.7 Gbps Active Back-Termination,
Differential Laser Diode Driver
ADN2525
Rev. 0
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.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Up to 10.7 Gbps operation
Very low power: 670 mW (IBIAS = 40 mA, IMOD = 40 mA)
Typical 24 ps rise/fall times
Full back-termination of output transmission lines
Drives TOSAs with resistances ranging from 5 Ω to 50 Ω
PECL-/CML-compatible data inputs
Bias current range: 10 mA to 100 mA
Differential modulation current range: 10 mA to 80 mA
Automatic laser shutdown (ALS)
3.3 V operation
Compact 3 mm × 3 mm LFCSP package
Voltage input control for bias and modulation currents
XFP-compliant bias current monitor
Optical evaluation board available
APPLICATIONS
SONET OC-192 optical transceivers
SDH STM-64 optical transceivers
10 Gb Ethernet optical transceivers
XFP/X2/XENPAK/XPAK/MSA 300 optical modules
SR and VSR optical links
GENERAL DESCRIPTION
The ADN2525 laser diode driver is designed for direct modula-
tion of packaged laser diodes having a differential resistance
ranging from 5 Ω to 50 Ω. The active back-termination technique
provides excellent matching with the output transmission lines
while reducing the power dissipation in the output stage. The
back-termination in the ADN2525 absorbs signal reflections
from the TOSA end of the output transmission lines, enabling
excellent optical eye quality to be achieved even when the
TOSA end of the output transmission lines is significantly mis-
terminated. The small package provides the optimum solution
for compact modules where laser diodes are packaged in low
pin-count optical subassemblies.
The modulation and bias currents are programmable via the
MSET and BSET control pins. By driving these pins with
control voltages, the user has the flexibility to implement
various average power and extinction ratio control schemes,
including closed-loop control and look-up tables. The automatic
laser shutdown feature allows the user to turn on/off the bias
and modulation currents by driving the ALS pin with the
proper logic levels.
The product is available in a space-saving 3 mm × 3 mm LFCSP
package specified from −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
50
IMOD
200
800
200
2
VCC
DATAP
DATAN
MSET
GND
BSET
IBMON
IBIAS
IMODP
IMODN
ADN2525
VCC
ALS
GND
VCC
VCC
50
50
200
800
Figure 1.


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