319560078EVAL_ADN2525_NT_ADN2525_OP| Application Note
Optical Evaluation Kit for the ADN2525 EVAL-ADN2525-NT/ADN2525-OP
GENERAL DESCRIPTION
This data sheet describes the optical evaluation kit for the ADN2525, a 10 Gbps, active back-termination, differential laser diode driver. The differential configuration of the output stage combined with on-chip active back-termination ensures high quality eye diagrams at lower power consumption compared with traditional approaches on 10 Gbps laser diode drivers. Complete specifications can be found in the ADN2525 data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this data sheet when using the evaluation board. The EVAL-ADN2525-OP evaluation kit consists of an evaluation board that provides optical evaluation of the ADN2525 with an Opnext 10 Gbps 1310 nm TOSA (LD5033SMDL). The EVAL-ADN2525-NT evaluation kit consists of the same evaluation board without a TOSA attached. To evaluate the performance of the ADN2525, the board must be connected to the test setup as shown in Figure 1. A fiber patch cord with an appropriate connector for the TOSA end is required to connect
the TOSA to the oscilloscope.
Z0 = 50
The power supply must be able to deliver 400 mA at 3.3 V. The amplitude of the data signal from the pattern generator must be adjusted to within the ADN2525 data sheet specifications for data inputs, typically 1 V peak-to-peak differential (500 mV single-ended on DATAP and DATAN). The oscilloscope/digital communications analyzer must have a 1310 nm optical channel that can accept and display properly the optical signals generated by the TOSA. The coaxial cables used to connect the pattern generator to the evaluation board DATAP/DATAN inputs must be suitable for carrying 10 Gbps signals without significant reduction of rise/fall time or introduction of pattern jitter. They should also be a matched pair with a delay skew of 2 ps. An example of suitable cables is the 60 cm Lab-Flex 160 cables with 2.4 mm connectors from Florida RF Labs.
TRIGGER OUT
TRIGGER IN
DATA PATTERN GENERATOR
Z0 = 50
J6
ADN2525
OPTICAL EVALUATION BOARD
OPTICAL FIBER
DATA
Z0 = 50
J5 J2 J4 J1
TOSA
OSCILLOSCOPE/ DIGITAL COMMUNICATIONS ANALYZER
BSET
VCC
MSET
Figure 1. ADN2525 Optical Evaluation Board Test Setup
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems.
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 2007 Analog Devices, Inc. All rights reserved.
06368-001
POWER SUPPLY 0V TO 1.2V/2mA
POWER SUPPLY 3.3V/400mA
POWER SUPPLY 0V TO 1.2V/2mA
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