3.3 V, 50 Mbps to 4.25 Gbps,
Single-Loop, Laser Diode Driver
ADN2873
Data Sheet
FEATURES
GENERAL DESCRIPTION
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
Bias current 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
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/ADuC7020/ADuC7023 family of
MicroConverter® devices and with the ADN2890/ADN2891/
ADN2892 family of limiting amplifiers to make a complete
SFP/SFF transceiver chipset solution.
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
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.
APPLICATIONS DIAGRAM
VCC
VCC
VCC
VCC
L
Tx_DISABLE
Tx_FAULT
FAIL
ALS
IMODN
LASER
R
VCC
IMODP
MPD
DATAP
PAVSET
ANALOG DEVICES
MICROCONTROLLER
PAVREF
DAC
GND
RZ
×100
1kΩ
CCBIAS
IMOD
ERREF
DAC
VCC
IBIAS
RPAV
ADC
DATAN
100Ω
CONTROL
ERSET
ADN2873
1kΩ
GND
IBMON
IMMON
1kΩ
470Ω
PAVCAP
DNC
GND
GND
GND
07493-001
VCC 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 ©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
ADN2873
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Laser Control .............................................................................. 13
Applications ....................................................................................... 1
Control Methods ........................................................................ 13
General Description ......................................................................... 1
Voltage Setpoint Calibration ..................................................... 13
Applications Diagram ...................................................................... 1
Resistor Setpoint Calibration .................................................... 15
Revision History ............................................................................... 2
IMPD Monitoring .......................................................................... 15
Specifications..................................................................................... 3
Loop Bandwidth Selection ........................................................ 16
SFP Timing Specifications........................................................... 5
Power Consumption .................................................................. 16
Absolute Maximum Ratings ............................................................ 6
Automatic Laser Shutdown (Tx_Disable)............................... 16
ESD Caution .................................................................................. 6
Bias and Modulation Monitor Currents.................................. 16
Pin Configuration and Function Descriptions ............................. 7
IBIAS Pin ..................................................................................... 16
Typical Performance Characteristics ............................................. 8
Data Inputs .................................................................................. 17
Single-Ended Output ................................................................... 8
Laser Diode Interfacing ............................................................. 17
Differential Output ....................................................................... 9
Alarms .......................................................................................... 18
Performance Characteristics ..................................................... 10
Outline Dimensions ....................................................................... 19
Optical Waveforms ......................................................................... 12
Ordering Guide .......................................................................... 19
Theory of Operation ...................................................................... 13
REVISION HISTORY
8/2016—Rev. A to Rev. B
Changes to Ordering Guide .......................................................... 19
1/2016—Rev. 0 to Rev. A
Changed NC to DNC .................................................... Throughout
Changes to General Description Section ...................................... 1
Change to Figure 6 and Table 4 ...................................................... 7
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 19
6/2008—Revision 0: Initial Version
Rev. B | Page 2 of 20
Data Sheet
ADN2873
SPECIFICATIONS
VCC = 3.0 V to 3.6 V. All specifications TMIN to TMAX 1, unless otherwise noted. Typical values are specified at 25°C.
Table 1.
Parameter
LASER BIAS CURRENT (IBIAS)
Output Current IBIAS
Compliance Voltage
IBIAS when ALS Is High
MODULATION CURRENT (IMODP, IMODN) 2
Output Current IMOD
Compliance Voltage
IMOD when ALS Is High
Rise Time Single-Ended Output2, 3
Fall Time Single-Ended Output2, 3
Random Jitter Single-Ended Output2, 3
Deterministic Jitter Single-Ended Output3, 4
Pulse Width Distortion2, 3 Single-Ended Output
Rise Time Differential Output3, 5
Fall Time Differential Output3, 5
Random Jitter Differential Output3, 5
Deterministic Jitter Differential Output3, 6
Pulse Width Distortion Differential Output3, 5
Rise Time Differential Output3, 5
Fall Time Differential Output3, 5
Random Jitter Differential Output3, 5
Deterministic Jitter Differential Output3, 7
Pulse Width Distortion Differential Output3, 5
AVERAGE POWER SET (PAVSET)
Pin Capacitance
Voltage
Photodiode Monitor Current (Average Current)
EXTINCTION RATIO SET INPUT (ERSET)
Resistance Range
AVERAGE POWER REFERENCE VOLTAGE INPUT (PAVREF)
Voltage Range
Photodiode Monitor Current (Average Current)
EXTINCTION RATIO REFERENCE VOLTAGE INPUT (ERREF)
Voltage Range
ERREF Voltage to IMOD Gain
DATA INPUTS (DATAP, DATAN) 8
Input Voltage Swing (Differential)
Input Impedance (Single-Ended)
LOGIC INPUTS (ALS)
VIH
VIL
ALARM OUTPUT (FAIL) 9
VOFF
VON
Min
Typ
Max
Unit
2
1.2
100
VCC
0.1
mA
V
mA
5
1.5
90
VCC
0.1
104
96
1.1
35
30
mA
V
mA
ps
ps
ps (rms)
ps
ps
ps
ps
ps (rms)
ps
ps
ps
ps
ps (rms)
ps
ps
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
20 mA < IMOD < 90 mA
20 mA < IMOD < 90 mA
5 mA < IMOD < 30 mA
5 mA < IMOD < 30 mA
5 mA < IMOD < 30 mA
5 mA < IMOD < 30 mA
5 mA < IMOD < 30 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
5 mA < IMOD < 90 mA
80
1.3
1200
pF
V
µA
Resistor setpoint mode
25
1.01
kΩ
kΩ
Resistor setpoint mode
Voltage setpoint mode
1
1000
V
µA
Voltage setpoint mode (RPAV fixed at 1 kΩ)
Voltage setpoint mode (RPAV fixed at 1 kΩ)
0.9
V
mA/V
Voltage setpoint mode (RERSET fixed at 1 kΩ)
2.4
V p-p
Ω
AC-coupled
60
60
0.8
19
21
47.1
46
0.64
12
2.1
56
55
0.61
17
1.6
1.1
50
1.5
0.99
1.2
1
0.07
70
0.05
100
0.4
50
2
0.8
V
V
>1.8
V
1.2 V typical (±10% tolerance)
Alarm if >2.0 V
Alarm if shorted to VCC (the alarm is
valid for voltage setting mode only)
Ignore
Undervoltage or Short to GND Condition
Ignore
Alarm if
很抱歉,暂时无法提供与“ADN2873ACPZ-RL”相匹配的价格&库存,您可以联系我们找货
免费人工找货