ADN2843

10.709 Gbps Laser Diode

Driver Chipset

REV. 0

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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

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FUNCTIONAL BLOCK DIAGRAM

MPD

IMPD

IMPD2

GND

MODE

ALS

ERSET

PSET

IDTONE

ADN2844

GND

GND

GND

ERCAP

PAVCAP

GND

CONTROL

IBIAS_CTRL

D_IMOD

IMOD_CTRL

DATAP

DATAN

ADN2843

ADN2845

IMODN

GND

IBIAS

ALS

*ADN2850 OR ADN2860 OPTICAL SUPERVISOR

LD

GND

IMODP

ASET

*

*

FEATURES

Data Rates from 9.952 Gbps to 10.709 Gbps

Typical Rise/Fall Time 25 ps/23 ps

Bias Current Range 3 mA to 80 mA

Modulation Current Range 5 mA to 80 mA

Monitor Photodiode Current 50

A to 1200

A

Closed-Loop Control of Both Average Optical Power

and Extinction Ratio

Laser Fail and Laser Degrade Alarms

Automatic Laser Shutdown, ALS

Dual MPD Functionality for Wavelength Control

CML Data Inputs

50

Internal Data Terminations

3.3 V Single-Supply Operation

Driver Supplied in Dice Format

APPLICATIONS

SONET OC-192, SDH STM-64

Supports 10.667 Gbps and 10.709 Gbps FEC Rates

10 Gb Ethernet IEEE802.3ae

GENERAL DESCRIPTION

The ADN2943 chipset consists of two components, the ADN2845

and the ADN2844. The ADN2845 is a 10.709 Gbps laser diode

driver. The ADN2845 eliminates the need to ac couple since it

can deliver 80 mA of modulation while dc coupled to the laser

diode. It is intended to be copackaged with the laser to minimize

bond lengths, which improves performance of the optical

transmitter. For transmission line applications, contact HSN

Application Group at fiberoptic.ic@analog.com.

The ADN2844 offers a unique control loop algorithm and pro-

vides dual loop control of both average power and extinction ratio.

Programmable alarms are provided for laser fail (end of life) and

laser degrade (impending fail).

Both the ADN2844 and the ADN2845 are available as bare die.

The ADN2844 is also available in 5 mm

¥ 5 mm 32-lead LFCSP.

a