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ADN8820

Analog Devices
Part Number ADN8820
Manufacturer Analog Devices
Description EDFA and CW Laser Controller
Published Mar 23, 2005
Detailed Description EDFA and CW Laser Controller Preliminary Technical Data FEATURES Four Operational Modes Including: Constant Laser Curren...
Datasheet PDF File ADN8820 PDF File

ADN8820
ADN8820

Overview
EDFA and CW Laser Controller Preliminary Technical Data 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 ADN8820* 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.
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 ...


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