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ADN2870
(Rev.:RevA)

3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

Analog Devices 

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 Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Optical Waveforms ......................................................................... 10

Multirate Performance Using Low Cost Fabry Perot

Tosa NEC NX7315UA ............................................................... 10

Dual-Loop Performance Over Temperature Using DFB

Tosa SUMITOMO SLT2486...................................................... 10

REVISION HISTORY

3/08—Rev 0 to Rev. A

Changes to Features, General Description, and Figure 1............ 1

Changes to Table 3............................................................................ 6

Changes to Figure 5 .......................................................................... 7

Reorganized Layout.......................................................................... 8

Changes to Modulation Control Loop Section .......................... 11

Changes to Operation with Lasers with Temperature-

Dependent Nonlinearity of Laser LI Curve Section .................. 12

Changes to Voltage Setpoint Calibration Section ...................... 12

Changes to Figure 26 and Figure 27............................................. 13

Theory of Operation ...................................................................... 11

Dual-Loop Control .................................................................... 11

Control......................................................................................... 12

Voltage Setpoint Calibration..................................................... 12

Resistor Setpoint Calibration.................................................... 14

IMPD Monitoring .......................................................................... 14

Loop Bandwidth Selection ........................................................ 15

Power Consumption .................................................................. 15

Automatic Laser Shutdown (Tx_Disable)............................... 15

Bias and Modulation Monitor Currents.................................. 15

Data Inputs .................................................................................. 15

Laser Diode Interfacing ............................................................. 16

Alarms.......................................................................................... 17

Outline Dimensions ....................................................................... 18

Ordering Guide .......................................................................... 18

Changes to Resistor Setpoint Calibration Section and IMPD

Monitoring Section ........................................................................ 14

Changes to Loop Bandwidth Selection Section ......................... 15

Changes to Laser Diode Interfacing Section, Figure 32, and

Figure 33 .......................................................................................... 16

Changes to Table 5.......................................................................... 17

Updated Outline Dimensions ....................................................... 18

Changes to Ordering Guide .......................................................... 18

8/04—Revision 0: Initial Version

Rev. A | Page 2 of 20

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