REV. 0

a

ADN2848

3 V Dual-Loop 50 Mbps to 1.25 Gbps

Laser Diode Driver

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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.

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Tel: 781/329-4700

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Fax: 781/326-8703

© 2003 Analog Devices, Inc. All rights reserved.

FUNCTIONAL BLOCK DIAGRAM

CONTROL

DATAP

DATAN

CLKP

CLKN

IMODP

LD

GND

ASET

GND

GND

GND

GND

PAVCAP

ERCAP

ERSET

PSET

MPD

ADN2848

LBWSET

IMODN

IMPD

GENERAL DESCRIPTION

The ADN2848 uses a unique control algorithm to control both

the average power and extinction ratio of the laser diode, LD,

after initial factory setup. External component count and PCB

area are low as both power and extinction ratio control are

fully integrated. Programmable alarms are provided for laser fail

(end of life) and laser degrade (impending fail).

FEATURES

50 Mbps to 1.25 Gbps Operation

Single 3.3 V Operation

Bias Current Range 2 mA to 100 mA

Modulation Current Range 5 mA to 80 mA

Monitor Photo Diode Current 50

A to 1200

A

50 mA Supply Current at 3.3 V

Closed-Loop Control of Power and Extinction Ratio

Full Current Parameter Monitoring

Laser Fail and Laser Degrade Alarms

Automatic Laser Shutdown, ALS

Optional Clocked Data

Supports FEC Rates

32-Lead (5 mm

× 5 mm) LFCSP Package

APPLICATIONS

SONET OC-1/3/12

SDH STM-0/1/4

Fibre Channel

Gigabit Ethernet