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ADN2830ACP-32

Continuous Wave Laser Average Power Controller

Analog Devices 

PRELIMINARY TECHNICAL DATA

a

Continuous Wave Laser

Average Power Controller

Preliminary Technical Data

ADN2830

FEATURES

Bias Current range 4mA to 200 mA

Monitor Photo Diode current 50uA to 1200uA

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

5mm x5mm 32 pin 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 Photo-

Diode (MPD) current and hence 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.

V CC

MPD

IMPD

GN D

PSET

RPSET

GN D

CONTROL

PA VC AP

GN D

VCC

LD

IBIAS

A SET

GN D

FUNCTIONAL BLOCK DIAGRAM

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

which may result from its use. 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

Analog Devices, Inc., 2002

REV. PrE May 2002

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