ADN2871ACPZ(2005) データシートの表示（PDF） - Analog Devices
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ADN2871ACPZ Datasheet PDF : 20 Pages
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FEATURES
SFP/SFF and SFF-8472 MSA-compliant
SFP reference design available
50 Mbps to 4.25 Gbps operation
Automatic average power control
Typical rise/fall time 60ps
Supports VCSEL, DFB, and FP lasers
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
Voltage setpoint control
Resistor setpoint control
Pin-compatible with ADN2870
APPLICATIONS
1×/2×/4× Fibre Channel SFP/SFF modules
Multirate OC3 to OC48-FEC SFP/SFF modules
LX-4 modules
DWDM/CWDM SFP modules
1GE SFP/SFF transceiver modules
VCSEL, DFB, and FP transmitters
3.3 V, 50 Mbps to 4.25 Gbps
Single-Loop Laser Diode Driver
ADN2871
GENERAL DESCRIPTION
The ADN2871 laser diode driver is designed for advanced
SFP and SFF modules, using SFF-8472 digital diagnostics. The
ADN2871 supports operation from 50 Mbps to 4.25 Gbps.
Average power and extinction ratio can be set with a voltage
provided by a microcontroller DAC or by a trimmable resistor
or digital potentiometer. The average power control loop is
implemented using feedback from a monitor photodiode. 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 pin-compatible with
the ADN2870 dual-loop LDD, allowing one PC board layout to
work with either device. For dual-loop applications, refer to the
ADN2870 data sheet.
The product is available in a space-saving 4 mm × 4 mm LFCSP
specified over the −40°C to +85°C temperature range.
Figure 1 shows an application diagram of the voltage setpoint
control with single-ended laser interface. Figure 36 shows a
differential laser interface.
VCC
Tx_DISABLE
Tx_FAULT
VCC
MPD
FAIL
ALS
VCC
IMODN
VCC
L
R
IMODP
VCC
LASER
DATAP
ADI
MICROCONTROLLER
DAC
ADC
PAVSET
PAVREF
RPAV
1kΩ
DAC
GND ERREF
ERSET
1kΩ
GND
CONTROL
×100
IMOD
100Ω
IBIAS
CCBIAS
ADN2871
VCC GND
IBMON
IMMON PAVCAP NC
GND
DATAN
1kΩ
470Ω
GND
GND
Figure 1. Application Diagram of Voltage Setpoint Control with Single-Ended Laser Interface
Rev. 0
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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: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
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