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Diode Driver. ADN2848 Datasheet

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Diode Driver. ADN2848 Datasheet






ADN2848 Driver. Datasheet pdf. Equivalent




ADN2848 Driver. Datasheet pdf. Equivalent





Part

ADN2848

Description

3V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver



Feature


Data Sheet 3.3 V Dual-Loop 50 Mbps to 1 .25 Gbps Laser Diode Driver ADN2848 FE ATURES 50 Mbps to 1.25 Gbps operation S ingle 3.3 V operation Bias current rang e: 2 to 100 mA Modulation current range : 5 to 80 mA Monitor photo diode curren t: 50 μA to 1200 μA 50 mA supply curr ent at 3.3 V Closed-loop control of pow er and extinction ratio Full current pa rameter monitoring L.
Manufacture

Analog Devices

Datasheet
Download ADN2848 Datasheet


Analog Devices ADN2848

ADN2848; aser fail and laser degrade alarms Autom atic laser shutdown (ALS) Optional cloc ked data Supports FEC rates 32-lead, 5 mm × 5 mm LFCSP_VQ package GENERAL DE SCRIPTION The ADN2848 uses a unique con trol algorithm to control both the aver age power and the extinction ratio of t he laser diode (LD) after initial facto ry setup. External component count and PCB area are low be.


Analog Devices ADN2848

cause both power and extinction ratio co ntrol are fully integrated. Programmabl e alarms are provided for laser fail (e nd of life) and laser degrade (impendin g fail). APPLICATIONS SONET OC-1/3/12/ 24 SDH STM-0/1/4 Fibre Channel Gigabit Ethernet MPD VCC IMPD PSET GND ERSET GND IBMON IMMON IMPDMON ALS FAIL DEGR ADE CLKSEL VCC GND FUNCTIONAL BLOCK DI AGRAM VCC IMODN I.


Analog Devices ADN2848

MODP VCC LD IMOD CONTROL IBIAS ERCAP DATAP DATAN CLKP CLKN IBIAS ADN2848 A SET PAVCAP LBWSET GND VCC RZ GND GND Figure 1. 02746-001 Rev. B Docu ment Feedback Information furnished by Analog Devices is believed to be accur ate and reliable. However, no responsi bility is assumed by Analog Devices for its use, nor for any infringements of patents or other .

Part

ADN2848

Description

3V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver



Feature


Data Sheet 3.3 V Dual-Loop 50 Mbps to 1 .25 Gbps Laser Diode Driver ADN2848 FE ATURES 50 Mbps to 1.25 Gbps operation S ingle 3.3 V operation Bias current rang e: 2 to 100 mA Modulation current range : 5 to 80 mA Monitor photo diode curren t: 50 μA to 1200 μA 50 mA supply curr ent at 3.3 V Closed-loop control of pow er and extinction ratio Full current pa rameter monitoring L.
Manufacture

Analog Devices

Datasheet
Download ADN2848 Datasheet




 ADN2848
Data Sheet
3.3 V Dual-Loop 50 Mbps to 1.25 Gbps
Laser Diode Driver
ADN2848
FEATURES
50 Mbps to 1.25 Gbps operation
Single 3.3 V operation
Bias current range: 2 to 100 mA
Modulation current range: 5 to 80 mA
Monitor photo diode current: 50 μA to 1200 μA
50 mA supply current at 3.3 V
Closed-loop control of power and extinction ratio
Full current parameter monitoring
Laser fail and laser degrade alarms
Automatic laser shutdown (ALS)
Optional clocked data
Supports FEC rates
32-lead, 5 mm × 5 mm LFCSP_VQ package
GENERAL DESCRIPTION
The ADN2848 uses a unique control algorithm to control both
the average power and the extinction ratio of the laser diode
(LD) after initial factory setup. External component count and
PCB area are low because both power and extinction ratio
control are fully integrated. Programmable alarms are provided
for laser fail (end of life) and laser degrade (impending fail).
APPLICATIONS
SONET OC-1/3/12/24
SDH STM-0/1/4
Fibre Channel
Gigabit Ethernet
MPD
VCC
IMPD
PSET
GND ERSET
GND
FUNCTIONAL BLOCK DIAGRAM
VCC
IMODN
IMODP
VCC
LD
IMOD
CONTROL
IBIAS
ERCAP
DATAP
DATAN
CLKP
CLKN
IBIAS
ADN2848
ASET
PAVCAP
LBWSET
GND
VCC
RZ
GND
GND
Figure 1.
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 ©2003–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




 ADN2848
ADN2848
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Theory of Operation ........................................................................ 7
Control ........................................................................................... 7
Loop Bandwidth Selection .......................................................... 7
Data Sheet
Alarms .............................................................................................7
Monitor Currents ..........................................................................8
Data and Clock Inputs ..................................................................8
CCBIAS...........................................................................................8
IBIAS ...................................................................................................8
Automatic Laser Shutdown..........................................................8
Alarm Interfaces ............................................................................8
Power Consumption .....................................................................9
Laser Diode Interfacing ................................................................9
Optical Supervisor.........................................................................9
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
REVISION HISTORY
2/13—Rev. A to Rev. B
Added EPAD Notation..................................................................... 6
Changes to Endnote ......................................................................... 8
Updated Outline Dimensions ....................................................... 12
Changes to Ordering Guide .......................................................... 12
8/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Figure 1 .......................................................................... 1
Changes to Specifications ................................................................ 3
Changes to Figure 8 ........................................................................ 10
Changes to Figure 9 to Figure11 ................................................... 11
Updated Outline Dimensions ....................................................... 12
Changes to Ordering Guide .......................................................... 12
1/03—Revision 0: Initial Version
Rev. B | Page 2 of 12




 ADN2848
Data Sheet
ADN2848
SPECIFICATIONS
VCC = 3.0 V to 3.6 V. All specifications TMIN to TMAX, unless otherwise noted.1 Typical values are specified at 25°C.
Table 1.
Parameter
LASER BIAS Current (IBIAS, ALS)
Output Current IBIAS
Compliance Voltage
IBIAS
ALS Response Time
CCBIAS Compliance Voltage
MODULATION CURRENT (IMODP, IMODN)
Output Current IMOD
Compliance Voltage
IMOD
Rise Time2
Fall Time2
Random Jitter2
Pulse Width Distortion2
MONITOR PD (MPD)
Current
Compliance Voltage
POWER SET INPUT (PSET)
Capacitance
Monitor Photodiode Current into RPSET Resistor
Voltage
EXTINCTION RATIO SET INPUT (ERSET)
Allowable Resistance Range
Voltage
ALARM SET (ASET)
Allowable Resistance Range
Voltage
Hysteresis
CONTROL LOOP
Time Constant
DATA INPUTS (DATAP, DATAN, CLKP, CLKN)3
V p-p (Single-Ended, Peak-to-Peak)
Input Impedance (Single-Ended)
tSETUP4
tHOLD4
LOGIC INPUTS (ALS, LBWSET, CLKSEL)
VIH
VIL
ALARM OUTPUTS (FAIL, DEGRADE)
VOH
VOL
IBMON, IMMON, IMPDMON
IMMON Division Ratio
IMPDMON
Compliance Voltage
Min Typ Max
Unit Conditions/Comments
2
100
mA
1.2
VCC
V
IBIAS
0.1
mA When ALS asserted
5
μs
IBIAS < 10% of nominal
1.2
VCC
V
5
80
1.5
VCC
0.1
80 170
80 170
1
1.5
15
mA
V
mA When ALS asserted
ps
ps
ps
RMS
ps
IMOD = 40 mA
50
1200
μA Average current
1.65
V
80
50
1200
1.1 1.2 1.3
pF
μA Average current
V
1.2
25
1.1 1.2 1.3
V
1.2
25
1.1 1.2 1.3
5
0.22
2.25
V
%
Low loop bandwidth selection
sec LBWSET = GND
sec
LBWSET = VCC
100
500
50
50
100
mV Data and clock inputs are
Ω
ac-coupled
ps
See Figure 2
ps
See Figure 2
2.4
V
0.8
V
Internal 30 kΩ pull-up
2.4
V
0.8
V
100
A/A
1
A/A
0
VCC − 1.2 V
Rev. B | Page 3 of 12



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