900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Analog Devices Semiconductor Electronic Components Datasheet

ADN2870 Datasheet

Laser Diode Driver

No Preview Available !

www.DataSheet4U.com
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
1k
DAC
GND ERREF
1kERSET
GND
FAIL
VCC
ALS
IMODN
VCC
L
R
IMODP
IMOD
CONTROL
IBIAS
100
IBIAS
CCBIAS
ADN2870
VCC GND
IBMON
IMMON PAVCAP ERCAP
GND
GND
VCC
LASER
DATAP
DATAN
Protected by US patent: US6414974
1k470
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.


Analog Devices Semiconductor Electronic Components Datasheet

ADN2870 Datasheet

Laser Diode Driver

No Preview Available !

ADN2870
TABLE OF CONTENTS
Specifications..................................................................................... 3
SFP Timing Specifications............................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Operating Characteristics.................................................. 8
Optical Waveforms Showing Multirate Performance Using
Low Cost Fabry Perot Tosa NEC NX7315UA .......................... 8
Optical Waveforms Showing Dual-Loop Performance Over
Temperature Using DFB Tosa SUMITOMO SLT2486............ 8
Performance Characteristics....................................................... 9
Theory of Operation ...................................................................... 11
Dual-Loop Control .................................................................... 11
Control......................................................................................... 12
REVISION HISTORY
8/04—Revision 0: Initial Version
Voltage Setpoint Calibration..................................................... 12
Resistor Setpoint Calibration.................................................... 14
IMPD Monitoring ...................................................................... 14
Loop Bandwidth Selection ........................................................ 15
Power Consumption .................................................................. 15
Automatic Laser Shutdown (TX_Disable).............................. 15
Bias and Modulation Monitor Currents.................................. 15
Data Inputs.................................................................................. 15
Laser Diode Interfacing............................................................. 16
Alarms.......................................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. 0 | Page 2 of 20


Part Number ADN2870
Description Laser Diode Driver
Maker Analog Devices
PDF Download

ADN2870 Datasheet PDF






Similar Datasheet

1 ADN2870 Laser Diode Driver
Analog Devices
2 ADN2871 Single-Loop Laser Diode Driver
Analog Devices
3 ADN2872 50 Mbps To 3.3 Gbps Laser Diode Driver
Analog Devices
4 ADN2873 Laser Diode Driver
Analog Devices





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy