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ADN8820-REEL7 Datasheet(PDF) 1 Page - Analog Devices

No. de pieza ADN8820-REEL7
Descripción Electrónicos  EDFA and CW Laser Controller
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Fabricante Electrónico  AD [Analog Devices]
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ADN8820-REEL7 Datasheet(HTML) 1 Page - Analog Devices

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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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