ADN2870ACPZ-RL7 Analog Devices Inc, ADN2870ACPZ-RL7 Datasheet

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

ADN2870ACPZ-RL7

Manufacturer Part Number
ADN2870ACPZ-RL7
Description
IC,Laser Diode/LED Driver,LLCC,24PIN,PLASTIC
Manufacturer
Analog Devices Inc
Type
Laser Diode Driver (Fiber Optic)r
Datasheet

Specifications of ADN2870ACPZ-RL7

Data Rate
3.3Gbps
Number Of Channels
1
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
30mA
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

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Part Number
Manufacturer
Quantity
Price
Part Number:
ADN2870ACPZ-RL7
Manufacturer:
ADI
Quantity:
8 000
Part Number:
ADN2870ACPZ-RL7
Manufacturer:
ADI
Quantity:
7 931
FEATURES
SFP/SFF MSA and SFF-8472 compliant
SFP reference design available
50 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
Voltage setpoint control
Resistor setpoint control
RoHS compliant
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
Rev. A
Information furnish
responsibility is assu
rights of third parties
license is granted by
Trademarks and regi
ed by Analog Devices is believed to be accurate and reliable. However, no
med by Analog Devices for its use, nor for any infringements of patents or other
stered trademarks are the property of their respective owners.
implication or otherwise under any patent or patent rights of Analog Devices.
that may result from its use. Specifications subject to change without notice. No
Tx_FAULT
Tx_FAIL
MICROCONTROLLER
ANALOG DEVICES
DAC
DAC
ADC
Figure 1. Application Diagram Showing Microcontroller Interface
1kΩ
1kΩ
GND
GND
V
CC
PAVSET
PAVREF
MPD
ERREF
ERSET
RPAV
APPLICATIONS DIAGRAM
3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps
VCC
V
GND
CC
FAIL
GND
IBMON
1kΩ
CONTROL
One Technology Way, P.O. Box 9106, Norwood, MA 020
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADN2870
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 needs only
to be calibrated at 25°C, eliminating the expensive and time
consuming temperature calibration. The ADN2870 supports
single-rate operation from 50 Mbps to 3.3 Gbps or multirate
operation from 155 Mbps to 3.3 Gbps.
Average power and extinction ratios can be set with reference
voltages provided by a microcontroller DAC or by adjustable
resistors. The ADN2870 provides bias and modulation current
monitoring as well as fail alarms and automatic laser shutdown.
The device interfaces easily with the ADuC702x 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 available in a
space-saving 4 mm × 4 mm LFCSP specified over the −40°C to
+85°C temperature range.
1
Protected by U.S. Patent 6,414,974.
GND
ALS
IMMON
470Ω
IMOD
IBIAS
GND
V
ADN2870
CC
PAVCAP
IMODN
1
laser diode driver is designed for advanced SFP
©2004–2008 Analog Devices, Inc. All r
GND
100Ω
ERCAP
Laser Diode Driver
IMODP
IBIAS
CCBIAS
V
CC
L
R
V
CC
R
Z
DATAP
DATAN
LASER
ADN2870
V
CC
ww
62-9106, U.S.A.
w.analog.com
ights reserved.

Related parts for ADN2870ACPZ-RL7

ADN2870ACPZ-RL7 Summary of contents

Page 1

FEATURES SFP/SFF MSA and SFF-8472 compliant SFP reference design available 50 Mbps to 3.3 Gbps operation Dual-loop control of average power and extinction ratio Typical rise/fall time 60 ps Bias current range 100 mA Modulation current range ...

Page 2

ADN2870 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 ESD Caution .................................................................................. 6 Pin ...

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 High CCBIAS Compliance Voltage MODULATION CURRENT (IMODP, IMODN) Output Current IMOD Compliance Voltage ...

Page 4

ADN2870 Parameter SUPPLY (with respect to GND Temperature range: −40°C to +85°C. 2 Measured into a 15 Ω load (22 Ω resistor in parallel with digital scope 50 Ω input) using a 11110000 ...

Page 5

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

Page 6

ADN2870 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter VCC to GND IMODN, IMODP PAVCAP, ERCAP, PAVSET, PAVREF, ERREF, IBIAS, IBMON, IMMON, ALS, CCBIAS, RPAV, ERSET, FAIL DATAP, DATAN (Single-Ended Differential) Junction Temperature Operating Temperature Range Industrial Storage Temperature Range Junction Temperature ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic 1 CCBIAS 2 PAVSET 3 GND 4 VCC 5 PAVREF 6 RPAV 7 ERCAP 8 PAVCAP 9 GND 10 DATAP 11 DATAN 12 ALS 13 ERSET 14 ...

Page 8

ADN2870 TYPICAL PERFORMANCE CHARACTERISTICS MODULATION CURRENT (mA) Figure 6. Rise Time vs. Modulation Current MODULATION CURRENT (mA) Figure 7. Fall Time vs. ...

Page 9

TEMPERATURE (°C) Figure 12. IBIAS/IBMON Gain vs. Temperature, I OC48 PRBS31 DATA TRANSMISSION t LESS THAN 1μs _OFF ALS Figure 13. ALS Assert Time, ...

Page 10

ADN2870 OPTICAL WAVEFORMS V = 3.3 V and T = 25°C, unless otherwise noted. Note that in Figure 18 through Figure 22, there is no change to the PAVCAP and CC A ERCAP values using either of the lasers or ...

Page 11

THEORY OF OPERATION Laser diodes have a current-in to light-out transfer function, as shown in Figure 23. Two key characteristics of this transfer function are the threshold current, Ith, and slope in the linear region beyond the threshold current, referred ...

Page 12

ADN2870 Operation with Lasers with Temperature-Dependent Nonlinearity of Laser LI Curve The ADN2870 ERCL extracts information from the monitor photodiode signal relating to the slope of the LI characteristics at the Optical 1 level (P1). For lasers with good linearity ...

Page 13

Tx_FAULT Tx_FAIL V CC MPD PAVSET ANALOG DEVICES MICROCONTROLLER PAVREF DAC ADC RPAV 1kΩ GND ERREF DAC ERSET 1kΩ GND Figure 26. Using MicroConverter Calibration and Monitoring PAVREF MPD RPAV PAVSET GND ERSET V ...

Page 14

ADN2870 RESISTOR SETPOINT CALIBRATION In resistor setpoint calibration, PAVREF, ERREF, and RPAV pins must all be tied to VCC. Average power and extinction ratio can be set using the PAVSET and ERSET pins, respectively. A resistor is placed between the ...

Page 15

V CC PHOTODIODE PAVSET ADN2870 µC ADC INPUT R Figure 31. Single Measurement of I Sense Resistor in Resistor Setpoint I LOOP BANDWIDTH SELECTION To ensure that the ADN2870 control loops have sufficient bandwidth, the average power loop capacitor (PAVCAP) ...

Page 16

ADN2870 LASER DIODE INTERFACING The schematic in Figure 32 describes the recommended circuit for interfacing the ADN2870 to most TO-Can or coax lasers. These lasers typically have impedances of 5 Ω Ω and have axial leads. The circuit ...

Page 17

ALARMS The ADN2870 has a latched active high monitoring alarm (FAIL). The FAIL alarm output is an open drain in conformance to SFP MSA specification requirements. The ADN2870 has a three-fold alarm system that recognizes: • Use of a bias ...

Page 18

... INDICATOR 1.00 0.85 0.80 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADN2870ACPZ −40°C to +85°C 1 ADN2870ACPZ-RL −40°C to +85°C ADN2870ACPZ-RL7 1 −40°C to +85° RoHS Compliant Part. 4.00 BSC SQ 0.60 MAX 0.50 BSC TOP 3.75 VIEW BSC SQ 0.50 0.40 ...

Page 19

NOTES Rev Page ADN2870 ...

Page 20

ADN2870 NOTES ©2004–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04510-0-3/08(A) Rev Page Error! Unknown document property name. ...

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