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ADN8820-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADN8820-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 9 page EDFA and CW Laser Controller Preliminary Technical Data ADN8820* * U.S. Patent Pending FEATURES Four Operational Modes Including: Constant Laser Current Constant Optical Output Power Constant EDFA Gain Constant Laser Power High Power Efficiency: >90% Three Built-In Photodiode TIAs Adjustable Laser Diode and EDFA Protection Limits Free-run or Synchronous Switching Frequency Modes Adjustable Phase Delay for Synchornous Clock Mode Optional Dithering Built-In Programmable Dither Frequency and Amplitude APPLICATIONS EDFA Pump Laser Diode Control CW Laser Bias Control Raman Amplifiers GENERAL DESCRIPTION The ADN8820 is a versatile Continuous Wave (CW) and EDFA laser diode driver and controller. It provides a low noise and precise current control for driving a source or pump laser diode. It can be set to operate in one of four controller modes: Constant Current (CC), Constant Laser Power (CLP), Constant Output Power (COP), or Constant EDFA Gain (CG). Multiple pump laser applications are easily supported by the ADN8820. Common-cathode-to-ground and common-anode-to-VDD configurations are also supported. The ADN8820 has a high speed closed-loop control, making it suitable for add/drop applications in telecommunication systems. It has a low-current shutdown mode and a soft-start feature to minimize power supply bounce on start-up. Protection circuitry is built into the device. The protection limits are easily adjustable and are used to set maximum output current and voltage, optical output power, EDFA gain, and pump or CW laser power. The output stage consists of a high-efficiency PWM amplifier in parallel with a high-speed linear amplifier. This provides the fastest settling time response along with the lowest power and heat dissipation. A pair of external MOSFETs on the PWM amplifier provide output currents of up to 5A. Three low-bias current TIAs are built-in. These allow amplification for the laser back-facet photodiode and EDFA input and output photodiodes. For CW laser applications, the two unused TIAs can be used for etalon photodiode amplification, allowing continuous wavelength monitoring. The ADN8820 is available in a 7 x 7 mm lead-frame chip scale package (LFCSP) with a package height of less than 1 mm. FUNCTIONAL BLOCK DIAGRAM Rev. PrB 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. 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 © 2003 Analog Devices, Inc. All rights reserved. |
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