ADN2870ACPZ データシートの表示（PDF） - Analog Devices

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ADN2870ACPZ

3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

Analog Devices 

3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps

Laser Diode Driver

ADN2870

FEATURES

SFP/SFF and SFF-8472 MSA-compliant

SFP reference design available

50 Mbps to 3.3 Gbps operation

Multirate 155 Mbps to 3.3 Gbps operation

Dual-loop control of average power and extinction ratio

Typical rise/fall time 60 ps

Bias current range 2 mA to 100 mA

Modulation current range 5 mA to 90 mA

Laser fail alarm and automatic laser shutdown (ALS)

Bias and modulation current monitoring

3.3 V operation

4 mm × 4 mm LFCSP package

Voltage setpoint control

Resistor setpoint control

APPLICATIONS

Multirate OC3 to OC48-FEC SFP/SFF modules

1×/2×/4× Fibre channel SFP/SFF modules

LX-4 modules

DWDM/CWDM SFP modules

1GE SFP/SFF transceiver modules

VCC

GENERAL DESCRIPTION

The ADN2870 laser diode driver is designed for advanced SFP

and SFF modules, using SFF-8472 digital diagnostics. The device

features dual-loop control of the average power and extinction

ratio, which automatically compensates for variations in laser

characteristics over temperature and aging. The laser need only

be calibrated at 25°C, eliminating the need for expensive and

time consuming temperature calibration. The ADN2870 supports

single-rate operation from 50 Mbps to 3.3 Gbps or multirate

from 155 Mbps to 3.3 Gbps.

Average power and extinction ratio can be set with a voltage

provided by a microcontroller DAC or by a trimmable resistor.

The part provides bias and modulation current monitoring as

well as fail alarms and automatic laser shutdown. The device

interfaces easily with the ADI ADuC70xx family of micro-

converters and with the ADN289x family of limiting amplifiers

to make a complete SFP/SFF transceiver solution. An SFP

reference design is available. The product is available in a space-

saving 4 mm ×4 mm LFCSP package specified over the −40°C to

+85°C temperature range.

Tx_FAULT

Tx_FAIL

VCC

MPD

ADI

MICROCONTROLLER

PAVSET

DAC

PAVREF

ADC

RPAV

1kΩ

DAC

GND ERREF

1kΩ ERSET

GND

FAIL

VCC

ALS

IMODN

VCC

L

R

IMODP

IMOD

CONTROL

IBIAS

100Ω

IBIAS

CCBIAS

ADN2870

VCC GND

IBMON

IMMON PAVCAP ERCAP

GND

GND

VCC

LASER

DATAP

DATAN

Protected by US patent: US6414974

1kΩ

470Ω

GND

GND

Figure 1. Application Diagram Showing Microcontroller Interface

Rev. 0

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. Trademarks and

registered trademarks are the property of their respective owners.

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 © 2004 Analog Devices, Inc. All rights reserved.

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