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ADN2830-EVALZ Arkusz danych(PDF) 1 Page - Analog Devices |
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ADN2830-EVALZ Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 10 page a ADN2830 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. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: © Analog Devices, Inc. All rights reserved. REV. REV. Continuous Wave Laser FUNCTIONAL BLOCK DIAGRAM GND GND PAVCAP VCC MPD IBMON IMPDMON ALS FAIL DEGRADE VCC GND CONTROL GND IMPD RPSET IBIAS GND RASET MODE VCC LD PSET ASET FEATURES Bias Current Range 4 mA to 200 mA Monitor Photodiode Current 50 A to 1200 A Closed-Loop Control of Average Power Laser FAIL and Laser DEGRADE Alarms Automatic Laser Shutdown, ALS Full Current Parameter Monitoring 5 V Operation –40 C to +85 C Temperature Range 5 mm 5 mm 32-Lead LFCSP Package APPLICATIONS Fiber Optic Communication GENERAL DESCRIPTION The ADN2830 provides closed-loop control of the average optical power of a continuous wave (CW) laser diode (LD) after initial factory setup. The control loop adjusts the laser IBIAS to maintain a constant back facet monitor photodiode (MPD) current and thus a constant laser optical power. The external PSET resistor is adjusted during factory setup to set the desired optical power. RPSET is set at 1.23/IAV, where IAV is the MPD current corresponding to the desired optical power. Programmable alarms are provided for laser fail (end of life) and laser degrade (impending fail). To provide monitoring of the MPD current, the MPD can be connected to the IMPD pin. In this case, the MPD current is mirrored to the IMPDMON pin to provide a monitor and internally to the PSET pin to close the control loop. By closing the feedback using IBMON rather than an MPD connected to PSET, the device is configured to control a constant current in the laser rather than a constant optical output power. Average Power Controller B 781/461-3113 2012 |
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