ADN2873 Driver Datasheet

ADN2873 Datasheet PDF, Equivalent


Part Number

ADN2873

Description

Laser Diode Driver

Manufacture

Analog Devices

Total Page 20 Pages
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Download ADN2873 Datasheet PDF


ADN2873
3.3 V, 50 Mbps to 4.25 Gbps,
Single-Loop, Laser Diode Driver
ADN2873
FEATURES
SFP/SFF and SFF-8472 MSA compliant
SFP reference design available
50 Mbps to 4.25 Gbps operation
Automatic average power control
Typical 60 ps output rise/fall time
VCSEL, DFB, and FP laser support
www.DataSheeBt4iaUs.ccoumrrent range: from 2 mA to 100 mA
Modulation current range: from 5 mA to 90 mA
Laser fail alarm and automatic laser shutdown (ALS)
Bias and modulation current monitoring
Voltage setpoint control
Resistor setpoint control
3.3 V supply
24-lead 4 mm × 4 mm LFCSP
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 laser transmitters
HDTV (SMPTE family) laser transmitters
GENERAL DESCRIPTION
Like the ADN2870, the ADN2873 laser diode driver (LDD) is
designed for advanced SFP and SFF modules, using SFF-8472
digital diagnostics. The ADN2873 supports NRZ data
transmission operation from 50 Mbps up to 4.25 Gbps. With a
new alarm scheme, this device avoids the shutdown issue
caused by the system transient generated from various lasers.
The ADN2873 monitors the laser bias and modulation currents
and it provides fail alarms and ALS. Using setup voltages of a
microcontroller DAC or a trimmable resistor voltage divider,
the ADN2873 can set up a laser optical average output power and
extinction ratio. The optical average power control loop consists
of an optical feedback from a photodiode, the comparator, and a
status holder. The ADN2873 works easily with the Analog
Devices, Inc., ADuC7019/ADuC702x family of MicroConverter®
devices and with the ADN289x family of limiting amplifiers to
make a complete SFP/SFF transceiver chipset solution.
The ADN2873 is pin compatible with the ADN2870 dual-loop
LDD, allowing the same design to work with either device. For
dual-loop control applications, refer to the ADN2870 data sheet.
The product is available in a space-saving 24-lead, 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.
Tx_DISABLE
Tx_FAULT
ANALOG DEVICES
MICROCONTROLLER
DAC
ADC
DAC
APPLICATIONS DIAGRAM
VCC
VCC
VCC
MPD
PAVSET
PAVREF
RPAV
1k
GND ERREF
ERSET
1k
GND
FAIL
ALS
IMODN
CONTROL
100
×100
IMOD
ADN2873
VCC GND
IBMON
1k
IMMON PAVCAP
470GND
GND
Figure 1.
GND
NC
VCC
L
R
VCC
LASER
IMODP
DATAP
IBIAS
DATAN
VCC
RZ
CCBIAS
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2008 Analog Devices, Inc. All rights reserved.

ADN2873
ADN2873
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Applications Diagram ...................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
SFP Timing Specifications........................................................... 5 
Absolute Maximum Ratings............................................................ 6 
www.DataShEeSeDt4UC.acuomtion.................................................................................. 6 
Pin Configuration and Function Descriptions............................. 7 
Typical Performance Characteristics ............................................. 8 
Single-Ended Output ................................................................... 8 
Differential Output....................................................................... 9 
Performance Characteristics..................................................... 10 
Optical Waveforms ......................................................................... 12 
Theory of Operation ...................................................................... 13 
REVISION HISTORY
6/08—Revision 0: Initial Version
Laser Control .............................................................................. 13 
Control Methods ........................................................................ 13 
Voltage Setpoint Calibration..................................................... 13 
Resistor Setpoint Calibration.................................................... 15 
IMPD Monitoring .......................................................................... 15 
Loop Bandwidth Selection........................................................ 16 
Power Consumption .................................................................. 16 
Automatic Laser Shutdown (TX_Disable) .............................. 16 
Bias and Modulation Monitor Currents.................................. 16 
IBIAS Pin ..................................................................................... 16 
Data Inputs.................................................................................. 17 
Laser Diode Interfacing............................................................. 17 
Alarms.......................................................................................... 18 
Outline Dimensions ....................................................................... 19 
Ordering Guide .......................................................................... 19 
Rev. 0 | Page 2 of 20


Features 3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop , Laser Diode Driver ADN2873 FEATURES S FP/SFF and SFF-8472 MSA compliant SFP r eference design available 50 Mbps to 4. 25 Gbps operation Automatic average pow er control Typical 60 ps output rise/fa ll time VCSEL, DFB, and FP laser suppor t Bias current range: from 2 mA to 100 mA www.DataSheet4U.com Modulation curre nt range: from 5 mA to 90 mA Laser fail alarm and automatic laser shutdown (AL S) Bias and modulation current monitori ng Voltage setpoint control Resistor se tpoint control 3.3 V supply 24-lead 4 m m × 4 mm LFCSP Pin compatible with ADN 2870 GENERAL DESCRIPTION Like the ADN2 870, the ADN2873 laser diode driver (LD D) is designed for advanced SFP and SFF modules, using SFF-8472 digital diagno stics. The ADN2873 supports NRZ data tr ansmission operation from 50 Mbps up to 4.25 Gbps. With a new alarm scheme, th is device avoids the shutdown issue cau sed by the system transient generated f rom various lasers. The ADN2873 monitors the laser bias and modu.
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