ADN2526ACPZ-R2 AD [Analog Devices], ADN2526ACPZ-R2 Datasheet

ADN2526ACPZ-R2

Manufacturer Part Number

ADN2526ACPZ-R2

Description

11.3 Gbps Active Back-Termination, Differential Laser Diode Driver

Manufacturer

AD [Analog Devices]

Datasheet

1.ADN2526ACPZ-R2.pdf (16 pages)

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FEATURES

3.3 V operation

Up to 11.3 Gbps operation

Typical 24 ps rise/fall times

Full back-termination of output transmission lines

Drives TOSAs with resistances ranging from 5 Ω to 50 Ω

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 diff

Automatic laser shutdown (ALS)

Cross point adjustment (CPA)

XFP-compliant bias current monitor

SFP+ MSA compliant

Optical evaluation board available

Compact 3 mm × 3 mm LFCSP

APPLICATIONS

SONET OC-192 and SDH STM-64 optical transceivers

10 Gb Fibre Channel transceivers

10 Gb Ethernet optical transceivers

SFP+/XFP/X2/XENPAK/XPAK/MSA 300 optical modules

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.

DATAN

DATAP

50Ω

MSET

800Ω

VCC

GND

FUNCTIONAL BLOCK DIAGRAM

200Ω

ADJUST

CROSS

POINT

VEE

CPA

11.3 Gbps Active Back-Termination,

VCC

Figure 1.

BSET

800Ω

Differential Laser Diode Driver

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 ADN2526 laser diode driver is designed for direct modula-

tion of packaged laser diodes that have a differential resistance

ranging from 5 Ω to 50 Ω. The active back-termination in the

ADN2526 absorbs signal reflections from the TOSA end of the

output transmission lines, enabling excellent optical eye quality to

be achieved even when the TOSA end of the output transmission

lines is significantly misterminated. ADN2526 is an SFP+ MSA-

compliant device, and its small package and enhanced ESD

protection provide the optimum solution for compact modules

where 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 closed-loop or look-up table control. The automatic

laser shutdown (ALS) feature allows the user to turn on/off the

bias and modulation currents by driving the ALS pin with a

LVTTL logic source.

The product is available in a space-saving 3 mm × 3 mm LFCSP

specified from −40°C to +85°C.

200Ω

50Ω

ALS

ADN2526

IMOD

200Ω

VCC

2Ω

IMODP

IMODN

IBMON

IBIAS

ADN2526

www.analog.com

Related parts for ADN2526ACPZ-R2

ADN2526ACPZ-R2 Summary of contents

Page 1

FEATURES 3.3 V operation Up to 11.3 Gbps operation Typical 24 ps rise/fall times Full back-termination of output transmission lines Drives TOSAs with resistances ranging from 5 Ω Ω Bias current range 100 mA Differential ...

Page 2

ADN2526 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Thermal Specifications ................................................................ 4 Absolute Maximum Ratings ............................................................ 6 ESD Caution .................................................................................. 6 Pin ...

Page 3

SPECIFICATIONS VCC = VCC to VCC , T = −40°C to +85°C, 50 Ω differential load resistance, unless otherwise noted. Typical values are specified at MIN MAX 25°C, IMOD = 40 mA, unless otherwise noted. A ...

Page 4

ADN2526 Parameter POWER SUPPLY SUPPLY CPA Cross Point 1 IMOD is the total modulation current sink capability for a differential driver. IMOD = I 2 Refers to the voltage between the pin for ...

Page 5

VEE VEE 1kΩ VBSET TP1 TP2 BSET IBMON IBIAS VCC GND ADN2526 Z = 50Ω 50Ω 10nF DATAP GND GND GND Z = 50Ω 50Ω 10nF DATAN GND GND GND ...

Page 6

ADN2526 ABSOLUTE MAXIMUM RATINGS VEE connected to supply ground. Table 3. Parameter Rating Supply Voltage, VCC to VEE −0 +4.2 V IMODP, IMODN to VEE 1 4.75 V DATAP, DATAN to VEE VCC − 1.8 V ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic I/O 1 MSET AI 2 CPA AI 3 ALS DI 4 VEE P 5 VCC P 6 IMODN AI 7 IMODP AI 8 VCC P 9 VEE ...

Page 8

ADN2526 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, VCC = 3.3 V, unless otherwise noted. A 27.0 26.5 26.0 25.5 25.0 24.5 24.0 23.5 23 IMOD (mA) Figure 5. Rise Time vs. IMOD 27.0 26.5 26.0 25.5 ...

Page 9

FREQUENCY (GHz) Figure 11. Differential |S22 ...

Page 10

ADN2526 THEORY OF OPERATION As shown in Figure 1, the ADN2526 consists of an input stage and two voltage-controlled current sources for bias and modula- tion. The bias current, which is available at the IBIAS pin, is controlled by the ...

Page 11

IBIAS VCC VCC 100Ω 2Ω Figure 21. Equivalent Circuit of the IBIAS Pin VCC VCC 500Ω 100Ω VCC IBMON Figure 22. Equivalent Circuit of the IBMON Pin The recommended configuration for BSET, IBIAS, and IBMON is shown in Figure 23. ...

Page 12

ADN2526 VCC VCC MSET 800Ω 200Ω Figure 26. Equivalent Circuit of the MSET Pin VCC IMODN IMODP 25Ω 3.3Ω 3.3Ω Figure 27. Equivalent IMODP and IMODN Pins, As Seen From Laser Side The recommended configuration of the MSET, IMODP, and ...

Page 13

CROSSPOINT ADJUSTMENT The optical eye cross point is adjustable between 35% and 65% using the cross point adjust (CPA) control input. The equivalent circuit for the CPA pin is shown in Figure 31 default CPA setting, leave CPA ...

Page 14

ADN2526 APPLICATIONS INFORMATION TYPICAL APPLICATION CIRCUIT Figure 34 shows the typical application circuit for the ADN2526. The dc voltages applied to the BSET and MSET pins control the bias and modulation currents. The bias current can be monitored as a ...

Page 15

DESIGN EXAMPLE This design example covers: • Headroom calculations for the IBIAS, IMODP, and IMODN pins. • Calculation of the typical voltage required at the BSET and MSET pins to produce the desired bias and modulation currents. This design example ...

Page 16

... PLANE ORDERING GUIDE Model Temperature Range 1 ADN2526ACPZ −40°C to +85°C 1 ADN2526ACPZ-R2 −40°C to +85°C ADN2526ACPZ-R7 1 −40°C to +85° RoHS Compliant Part. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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