ADN2531ACPZ-R2 Analog Devices Inc, ADN2531ACPZ-R2 Datasheet

IC, LASER DIODE DRIVER, 11.3GBPS LFCSP16

ADN2531ACPZ-R2

Manufacturer Part Number
ADN2531ACPZ-R2
Description
IC, LASER DIODE DRIVER, 11.3GBPS LFCSP16
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADN2531ACPZ-R2

Laser Driver Type
Laser Diode
Supply Current
36mA
Bias Current
100mA
Modulation Current
70mA
Data Rate
11.3Gbps
Supply Voltage Range
3V To 3.6V
Driver Case Style
LFCSP
No. Of Pins
16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
3.3 V operation
Up to 11.3 Gbps operation
Typical 26 ps rise/fall times
Bias current range: 10 mA to 100 mA
Differential modulation current range: 10 mA to 80 mA
Voltage input control for bias and modulation currents
Data inputs sensitivity: 150 mV p-p differential
Automatic laser shutdown (ALS)
Crosspoint adjustment (CPA)
VCSEL, FP, DFB laser support
SFF/SFP/XFP/SFP+ MSA compliant
Optical evaluation board available
Compact, 3 mm × 3 mm LFCSP
APPLICATIONS
Optical transmitters, up to 11.3 Gbps, for SONET/SDH,
SFF/SFP/SFP+/XFP/X2/XENPAK/XPAK MSA compliant
300-pin optical modules, up to 11.3 Gbps
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.
Ethernet, and Fibre Channel applications
DATAN
DATAP
MSET
50Ω
400Ω
50Ω
200Ω
VCC
FUNCTIONAL BLOCK DIAGRAM
VCC
GND
GND
CROSSPOINT
ADJUST
CPA
11.3 Gbps, Active Back-Termination,
Figure 1.
VCC
ALS
BSET
Differential Laser Diode Driver
800Ω
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 ADN2531 laser diode driver can work with directly
modulated laser diodes, including vertical-cavity surface-emitting
laser (VCSEL), Fabry-Perot (FP) lasers, and distributed feedback
(DFB) lasers, with a differential loading resistance ranging from
5 Ω to 140 Ω. The active back-termination in the ADN2531
absorbs signal reflections from the laser diode side of the output
transmission lines, enabling excellent optical eye quality even when
the TOSA end of the output transmission lines is significantly
mismatched. The ADN2531 is a SFP+ MSA-compliant device,
and its small package and enhanced ESD protection provides
the optimum solution for compact modules in which laser
diodes are packaged in low pin-count optical subassemblies.
The modulation and bias currents are programmable via the
MSET and BSET control pins. By driving these pins with control
voltages, the user has the flexibility to implement various average
optical power and extinction ratio control schemes, including a
closed-loop or a look-up table control. The automatic laser shut-
down (ALS) feature allows turning the bias on and off while
simultaneously modulating currents by driving the ALS pin with
a low voltage transistor-to-transistor logic (LVTTL) source.
The product is available in a space-saving, 3 mm × 3 mm LFCSP
package and operates from −40°C to +100°C.
200Ω
100Ω
ADN2531
200Ω
I
MOD
VCC
10Ω
©2009 Analog Devices, Inc. All rights reserved.
IMODP
IMODN
IBMON
IBIAS
ADN2531
www.analog.com

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ADN2531ACPZ-R2 Summary of contents

Page 1

FEATURES 3.3 V operation Up to 11.3 Gbps operation Typical 26 ps rise/fall times Bias current range 100 mA Differential modulation current range Voltage input control for bias and modulation currents Data ...

Page 2

ADN2531 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Package Thermal Specifications ................................................. 4 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 ...

Page 3

SPECIFICATIONS V = VCC to VCC , T = −40°C to +100°C, 12 Ω differential load impedance, crosspoint adjust disabled, unless otherwise noted. CC MIN MAX A Typical values are specified at 25°C and I Table 1. Parameter BIAS CURRENT ...

Page 4

ADN2531 Parameter POWER SUPPLY SUPPLY 1 The voltage between the pin with the specified compliance voltage and GND. 2 Specified for T = −40°C to +85°C due to test equipment limitation. See the ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage: VCC to GND −0 +4.2 V IMODP, IMODN to GND VCC − 1 4.5 V DATAP, DATAN to GND VCC − 1 VCC − 0.4 ...

Page 6

ADN2531 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic I/O 1 MSET Input 2 CPA Input 3 ALS Input 4 GND Power 5 VCC Power 6 IMODN Output 7 IMODP Output 8 VCC Power 9 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 3.3 V, crosspoint adjust disabled, unless otherwise noted (mA) MOD Figure 4. Rise Time vs ...

Page 8

ADN2531 –40 – TEMPERATURE (°C) Figure 10. Rise Time vs. Temperature (Worse-Case Conditions, CPA Disabled –40 – TEMPERATURE (°C) Figure 11. Fall ...

Page 9

I BIAS 200 180 50mA I 160 BIAS 140 120 100 80 10mA I BIAS CURRENT (mA) MOD Figure 16. Total Supply Current vs. I and ...

Page 10

ADN2531 TEST CIRCUIT V BSET GND Z = 50Ω 50Ω BLOCK GND GND GND Z = 50Ω 50Ω BLOCK J3 GND GND GND GND V MSET ...

Page 11

THEORY OF OPERATION As shown in Figure 1, the ADN2531 consists of an input stage and two voltage-controlled current sources for bias and modulation. The bias current is available at the IBIAS pin controlled by the voltage at ...

Page 12

ADN2531 The equivalent circuits of the BSET, IBIAS, and IBMON pins are shown in Figure 26 to Figure 28 BSET 800Ω 200Ω Figure 26. Equivalent Circuit of the BSET Pin V IBIAS 100Ω 10Ω Figure ...

Page 13

The equivalent circuits for the MSET, IMODP, and IMODN pins are shown in Figure 32 and Figure 33. The two 50 Ω resistors in Figure 33 represent the active back-termination resistance MSET 400Ω 200Ω Figure 32. ...

Page 14

ADN2531 LOAD MISTERMINATION Due to its excellent S22 performance, the ADN2531 can drive differential loads that range from 5 Ω to 140 Ω. In practice, many TOSAs have differential resistance not equal to 100 Ω. In this case, with 100 ...

Page 15

APPLICATIONS INFORMATION TYPICAL APPLICATION CIRCUIT Figure 40 shows a typical application circuit for the ADN2531. The dc voltages applied to the BSET and MSET pins control the bias and modulation currents. The bias current can be monitored as a voltage ...

Page 16

ADN2531 LAYOUT GUIDELINES Due to the high frequencies at which the ADN2531 o care should be taken when designing the P optimum performance. For example, use controlled impedance transmission lines for high speed signal paths, and keep the length of ...

Page 17

The value of K depends actual resistance of the TOSA and can be obtained from Figure 35. For a TOSA resistance of 12 Ω, the typical value 110 mA/V. Assuming that ...

Page 18

... OUTLINE DIMENSIONS PIN 1 INDICATOR 12° MAX 0.90 0.85 0.80 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADN2531ACPZ-WP −40°C to +100°C 1 ADN2531ACPZ-R2 −40°C to +100°C 1 ADN2531ACPZ- R7 −40°C to +100°C 1 EVAL-ADN2531-NTZ 1 EVAL-ADN2531-NPZ RoHS Compliant Part. 0.6 0 MAX 3.00 BSC SQ BOTTOM VIEW ...

Page 19

NOTES Rev Page ADN2531 ...

Page 20

ADN2531 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07881-0-9/09(0) Rev Page ...

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