ADN2871ACPZ-RL7 Analog Devices Inc, ADN2871ACPZ-RL7 Datasheet

IC,Laser Diode/LED Driver,LLCC,24PIN,PLASTIC

ADN2871ACPZ-RL7

Manufacturer Part Number
ADN2871ACPZ-RL7
Description
IC,Laser Diode/LED Driver,LLCC,24PIN,PLASTIC
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of ADN2871ACPZ-RL7

Data Rate
4.25Gbps
Number Of Channels
1
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
32mA
Current - Modulation
90mA
Current - Bias
100mA
Operating Temperature
-40°C ~ 85°C
Package / Case
24-VFQFN, CSP Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ADN2871ACPZ-RL7
Manufacturer:
ADI
Quantity:
720
FEATURES
SFP/SFF and SFF-8472 MSA-compliant
SFP reference design available
50 Mbps to 4.25 Gbps operation
Automatic average power control
Typical rise/fall time 60 ps
Supports VCSEL, DFB, and FP lasers
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
Pin-compatible with
APPLICATIONS
1×/2×/4× Fibre Channel SFP/SFF modules
Multirate OC3 to OC48-FEC SFP/SFF modules
LX-4 modules
DWDM/CWDM SFP modules
1GE SFP/SFF transceiver modules
VCSEL, DFB, and FP transmitters
Rev. A
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.
Tx_DISABLE
Tx_FAULT
ADN2870
MICROCONTROLLER
DAC
DAC
Figure 1. Application Diagram of Voltage Setpoint Control with a Single-Ended Laser Interface
ADI
ADC
1kΩ
1kΩ
GND
GND
V
CC
PAVSET
PAVREF
MPD
ERREF
ERSET
RPAV
V
CC
V
GND
CC
FAIL
GND
Single-Loop, Laser Diode Driver
IBMON
1kΩ
CONTROL
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADN2871 laser diode driver is designed for advanced SFP
and SFF modules, using SFF-8472 digital diagnostics. The
ADN2871 supports operation from 50 Mbps to 4.25 Gbps.
Average power and extinction ratio can be set with a voltage
provided by a microcontroller DAC or by a trimmable resistor
or digital potentiometer. The average power control loop is
implemented using feedback from a monitor photodiode. The
part provides bias and modulation current monitoring as well
as fail alarms and automatic laser shutdown (ALS). The device
interfaces easily with the Analog Devices, Inc. ADuC70xx
family of MicroConverters® 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
pin-compatible with the ADN2870 dual-loop LDD, allowing
one PC board layout to work with either device. For dual-loop
applications, refer to the
The product 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 of the voltage setpoint
control with single-ended laser interface. Figure 36 shows a
differential laser interface.
GND
3.3 V, 50 Mbps to 4.25 Gbps,
ALS
×100
IMMON
470Ω
IMOD
GND
V
ADN2871
CC
PAVCAP
IMODN
100Ω
©2007 Analog Devices, Inc. All rights reserved.
NC
ADN2870
IMODP
IBIAS
CCBIAS
V
CC
L
R
data sheet.
V
CC
R
Z
DATAP
DATAN
LASER
ADN2871
V
CC
www.analog.com

Related parts for ADN2871ACPZ-RL7

ADN2871ACPZ-RL7 Summary of contents

Page 1

FEATURES SFP/SFF and SFF-8472 MSA-compliant SFP reference design available 50 Mbps to 4.25 Gbps operation Automatic average power control Typical rise/fall time 60 ps Supports VCSEL, DFB, and FP lasers Bias current range 100 mA Modulation current ...

Page 2

ADN2871 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 SFP Timing Specifications............................................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Optical Waveforms ........................................................................... 8 ...

Page 3

SPECIFICATIONS 3.6 V. All specifications T CC Table 1. Parameter LASER BIAS CURRENT (IBIAS) Output Current (IBIAS) Compliance Voltage IBIAS when ALS is High MODULATION CURRENT (IMODP, IMODN) Output Current (IMOD) Compliance Voltage IMOD when ...

Page 4

ADN2871 Parameter 9 ALARM OUTPUT (FAIL) V OFF V ON IBMON/IMMON DIVISION RATIO 3 IBIAS/IBMON 3 IBIAS/IBMON 3 IBIAS/IBMON 3, 10 IBIAS/IBMON Stability IMOD/IMMON IBMON Compliance Voltage SUPPLY (with respect to GND Temperature ...

Page 5

SFP TIMING SPECIFICATIONS Table 2. Parameter ALS Assert Time 1 ALS Negate Time 1 Time to Initialize, Including Reset of FAIL FAIL Assert Time ALS to Reset Time 1 Guaranteed by design and characterization. Not production tested. Symbol Min Typ ...

Page 6

ADN2871 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter V to GND CC IMODN, IMODP All Other Pins Junction Temperature Operating Temperature Range Industrial Storage Temperature Range Junction Temperature (T max) J LFCSP 1 Power Dissipation 2 θ Thermal Impedance JA θ ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Note: The LFCSP has an exposed paddle that must be connected to ground. Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 CCBIAS In ac-coupled mode, CCBIAS can connect to either IBIAS or V ...

Page 8

ADN2871 OPTICAL WAVEFORMS V = 3.3 V and T = 25°C, unless otherwise noted. Note: No change to PAVCAP and ERCAP values MULTIRATE PERFORMANCE USING LOW COST FABRY PEROT TOSA NEC NX7315UA (ACQ LIMIT TEST) WAVEFORMS 1000 Figure ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS SINGLE-ENDED OUTPUT These performance characteristics were measured using the high speed, electrical single-ended, output circuit shown in Figure MODULATION CURRENT (mA) Figure 12. Rise Time vs. Modulation Current, ...

Page 10

ADN2871 DIFFERENTIAL OUTPUT These performance characteristics were measured using the high speed, electrical differential output circuit shown in Figure MODULATION CURRENT (mA) Figure 16. Rise Time vs. Modulation Current ...

Page 11

PERFORMANCE CHARACTERISTICS 250 220 I = 80mA BIAS 190 I BIAS 160 130 100 MODULATION CURRENT (mA) Figure 20. Total Supply Current vs. Modulation Current Total Supply Current = 120 ...

Page 12

ADN2871 FAIL ASSERTED FAULT FORCED ON PAVSET Figure 26. FAIL Assert Time,1 μs/DIV Figure 27. Time to Initialize, Including Reset, 40 ms/DIV Rev Page TRANSMISSION ON POWER SUPPLY TURN ON ...

Page 13

THEORY OF OPERATION Laser diodes have a current-in to light-out transfer function, as shown in Figure 28. Two key characteristics of this transfer function are the threshold current, Ith, and the slope in the linear region beyond the threshold current, ...

Page 14

ADN2871 Tx_DISABLE Tx_FAULT ADI MICROCONTROLLER DAC ADC DAC Figure 29. ADN2871 Using Microconverter Voltage Setpoint Calibration and Monitoring PAVREF MPD PAVSET V GND CC ERREF ERSET GND Figure 30. ADN2871 Using Resistor Setpoint Calibration of Average ...

Page 15

RESISTOR SETPOINT CALIBRATION In resistor setpoint calibration, Pin PAVREF, Pin ERREF, and Pin RPAV must all be tied The average power and CC extinction ratio can be set using the PAVSET and ERSET pins, respectively. A resistor ...

Page 16

ADN2871 Resistor Setpoint In resistor setpoint calibration, the current through the resistor from PAVSET to ground is the I current. The recommended MPD method for measuring the I current is to place a small MPD resistor in series with the ...

Page 17

DATA INPUTS Data inputs should be ac-coupled (10 nF capacitors are recommended) and are terminated via a 100 Ω internal resistor between the DATAP and DATAN pins. A high impedance circuit sets the common-mode voltage and is designed to allow ...

Page 18

ADN2871 ALARMS The ADN2871 has a latched, active high monitoring alarm (FAIL). The FAIL alarm output is an open drain in conformance to SFP MSA specification requirements. The ADN2871 has a three-fold alarm system that covers • Use of a ...

Page 19

... MAX 0.85 0.80 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADN2871ACPZ −40°C to +85°C 1 ADN2871ACPZ-RL −40°C to +85°C 1 ADN2871ACPZ-RL7 −40°C to +85° Pb-free part. 0.60 MAX 4.00 BSC SQ 0.60 MAX 19 0.50 18 BSC TOP 3.75 EXPOSED VIEW ...

Page 20

ADN2871 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05228-0-2/07(A) Rev Page ...

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