ADN2531 Driver Datasheet

ADN2531 Datasheet PDF, Equivalent


Part Number

ADN2531

Description

Differential Laser Diode Driver

Manufacture

Analog Devices

Total Page 20 Pages
Datasheet
Download ADN2531 Datasheet


ADN2531
11.3 Gbps, Active Back-Termination,
Differential Laser Diode Driver
ADN2531
FEATURES
3.3 V operation
Up to 11.3 Gbps operation
Typical 26 ps rise/fall times
Bias current range: 10 mA to 100 mA
Differential modulation current range: 10 mA to 80 mA
Voltage input control for bias and modulation currents
Data inputs sensitivity: 150 mV p-p differential
Automatic laser shutdown (ALS)
Crosspoint adjustment (CPA)
VCSEL, FP, DFB laser support
SFF/SFP/XFP/SFP+ MSA compliant
Optical evaluation board available
Compact, 3 mm × 3 mm LFCSP
APPLICATIONS
Optical transmitters, up to 11.3 Gbps, for SONET/SDH,
Ethernet, and Fibre Channel applications
SFF/SFP/SFP+/XFP/X2/XENPAK/XPAK MSA compliant
300-pin optical modules, up to 11.3 Gbps
GENERAL DESCRIPTION
The ADN2531 laser diode driver can work with directly
modulated laser diodes, including vertical-cavity surface-emitting
laser (VCSEL), Fabry-Perot (FP) lasers, and distributed feedback
(DFB) lasers, with a differential loading resistance ranging from
5 Ω to 140 Ω. The active back-termination in the ADN2531
absorbs signal reflections from the laser diode side of the output
transmission lines, enabling excellent optical eye quality even when
the TOSA end of the output transmission lines is significantly
mismatched. The ADN2531 is a SFP+ MSA-compliant device,
and its small package and enhanced ESD protection provides
the optimum solution for compact modules in which 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
optical power and extinction ratio control schemes, including a
closed-loop or a look-up table control. The automatic laser shut-
down (ALS) feature allows turning the bias on and off while
simultaneously modulating currents by driving the ALS pin with
a low voltage transistor-to-transistor logic (LVTTL) source.
The product is available in a space-saving, 3 mm × 3 mm LFCSP
package and operates from −40°C to +100°C.
www.DataSheet4U.com
DATAP
DATAN
FUNCTIONAL BLOCK DIAGRAM
VCC
CPA
ALS
VCC
VCC ADN2531
5050
GND
CROSSPOINT
ADJUST
100
IMOD
VCC
IMODP
IMODN
400
800
IBMON
IBIAS
200
200200
10
MSET
GND
BSET
Figure 1.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2009 Analog Devices, Inc. All rights reserved.

ADN2531
ADN2531
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Package Thermal Specifications ................................................. 4 
Absolute Maximum Ratings............................................................ 5 
ESD Caution.................................................................................. 5 
Pin Configuration and Function Descriptions............................. 6 
Typical Performance Characteristics ............................................. 7 
Test Circuit ...................................................................................... 10 
Theory of Operation ...................................................................... 11 
REVISION HISTORY
9/09—Revision 0: Initial Version
Input Stage................................................................................... 11 
Bias Current ................................................................................ 11 
Automatic Laser Shutdown (ALS) ........................................... 12 
Modulation Current................................................................... 12 
Load Mistermination ................................................................. 14 
Crosspoint Adjust....................................................................... 14 
Power Consumption .................................................................. 14 
Applications Information .............................................................. 15 
Typical Application Circuit....................................................... 15 
Layout Guidelines....................................................................... 16 
Design Example.......................................................................... 16 
Outline Dimensions ....................................................................... 18 
Ordering Guide .......................................................................... 18 
www.DataSheet4U.com
Rev. 0 | Page 2 of 20


Features 11.3 Gbps, Active Back-Termination, Diff erential Laser Diode Driver ADN2531 FEA TURES 3.3 V operation Up to 11.3 Gbps o peration Typical 26 ps rise/fall times Bias current range: 10 mA to 100 mA Dif ferential modulation current range: 10 mA to 80 mA Voltage input control for b ias and modulation currents Data inputs sensitivity: 150 mV p-p differential A utomatic laser shutdown (ALS) Crosspoin t adjustment (CPA) VCSEL, FP, DFB laser support SFF/SFP/XFP/SFP+ MSA compliant Optical evaluation board available Com pact, 3 mm × 3 mm LFCSP GENERAL DESCR IPTION The ADN2531 laser diode driver c an work with directly modulated laser d iodes, including vertical-cavity surfac e-emitting laser (VCSEL), Fabry-Perot ( FP) lasers, and distributed feedback (D FB) lasers, with a differential loading resistance ranging from 5 Ω to 140 Ω . The active back-termination in the AD N2531 absorbs signal reflections from t he laser diode side of the output trans mission lines, enabling excellent optical eye quality even when th.
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