ADN2872(RevB) Просмотр технического описания (PDF) - Analog Devices
Номер в каталоге
Компоненты Описание
производитель
ADN2872 Datasheet PDF : 20 Pages
| |||
Data Sheet
3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps
Laser Diode Driver
ADN2872
FEATURES
SFP/SFF and SFF-8472 MSA compliant
SFP reference design available
Any rate from 50 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
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
GENERAL DESCRIPTION
Like the ADN2870, the ADN28721 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 (ER), which automatically compensates
for variations in laser characteristics over temperature and aging.
The laser needs only be calibrated at 25°C, eliminating the need
for expensive and time consuming temperature calibration. The
ADN2872 supports single-rate operation from 50 Mbps to
3.3 Gbps, or multirate operation from 155 Mbps to 3.3 Gbps.
With a new alarm scheme, this device avoids the shutdown issue
caused by the system transient generated from various lasers.
The average power and ER can be set with a voltage provided by
a microcontroller digital-to-analog converter (DAC) or by a
trimmable resistor. The device provides both bias and modulation
current monitoring, as well as fail alarms and automatic laser
shutdown. The ADN2872, a SFF-/SFP-compliant laser diode driver,
can work with the Analog Devices, Inc., ADuC7019, ADuC7020,
and ADuC7023 MicroConverter® family and the ADN2890,
ADN2891, and ADN2892 limiting amplifier family, to form a
complete SFP/SFF transceiver solution. The ADN2872 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 with a microcontroller
interface.
1 Protected by U.S. Patent 6,414,974.
Tx_FAULT
Tx_FAIL
APPLICATIONS DIAGRAM
VCC
VCC
VCC
MPD
FAIL
ALS
IMODN
VCC
L
R
IMODP
VCC
LASER
DATAP
ANALOG DEVICES
MICROCONTROLLER
PAVSET
DAC
PAVREF
ADC
DAC
RPAV
1kΩ
GND ERREF
ERSET
1kΩ
GND
IMOD
CONTROL
IBIAS
100Ω
IBIAS
DATAN
VCC
RZ
CCBIAS
ADN2872
IBMON IMMON PAVCAP ERCAP
VCC GND
GND
GND
1kΩ
GND
Figure 1.
470Ω
GND
Rev. B
Document Feedback
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 ©2009–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
Share Link: 