3.3 V 2.7 Gb/s Limiting Amplifier Data Sheet ADN2890 FEATURES GENERAL DESCRIPTION SFP reference design available The ADN2890 is a high gain, limiting amplifier optimized for Input sensitivity: 3 mV p-p use in SONET, Gigabit Ethernet (GbE), and Fibre Channel 80 ps rise/fall times optical receivers that accept input levels of up to 2.0 V p-p CML outputs: 700 mV p-p differential differential and have 3 mV p-p differential input sensitivity. The Programmable LOS detector: 2 mV to 13 mV ADN2890 provides the receiver functions of quantization and Rx signal strength indicator (RSSI): loss of signal (LOS) detection. The ADN2890 can easily operate SFF-8472 compliant average power measurement at up to 3.2 Gb/s to support LX4 transceivers. Single-supply operation: 3.3 V The limiting amplifier also measures average received power Low power dissipation: 130 mW based on a direct measurement of the photodiode current with Available in space-saving 3 mm 3 mm 16-lead LFCSP better than 1 dB of accuracy over the entire input range of the receiver. This eliminates the need for external average Rx power APPLICATIONS detection circuitry in SFF-8472 compliant optical transceivers. SFP/SFF/GBIC optical transceivers OC-3/12/48, GbE, Fibre Channel receivers The ADN2890 limiting amplifier operates from a single 3.3 V 10GBASE-LX4 transceivers supply, has low power dissipation, and is available in a space- WDM transponders saving 3 mm 3 mm 16-lead lead frame chip scale package (LFCSP). FUNCTIONAL BLOCK DIAGRAM AVCC AVEE DRVCC DRVEE DRVCC ADN2890 50 50 C R PIN OUTP F F ADN2880 NIN OUTN 50 50 +V V REF 10k 3k LOS PD VCC RSSI/LOS RSSI OUT ADuC7020 DETECTOR PD CATHODE CAZ1 CAZ2 THRADJ SQUELCH 0.01 F Figure 1. Rev. A Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20042013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 04509-0-001ADN2890 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Theory of Operation .........................................................................8 General Description ......................................................................... 1 LIMAMP ........................................................................................8 Functional Block Diagram .............................................................. 1 Loss of Signal (LOS) Detector .....................................................8 Revision History ............................................................................... 2 Received Signal Strength Indicator (RSSI) ................................8 Specifications ..................................................................................... 3 Squelch Mode ................................................................................8 Absolute Maximum Ratings ............................................................ 5 Applications Information .................................................................9 Thermal Resistance ...................................................................... 5 PCB Design Guidelines ................................................................9 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 11 Pin Configuration and Function Descriptions ............................. 6 Ordering Guide .......................................................................... 11 REVISION HISTORY 10/13Rev. 0 to Rev. A Change to Output Voltage Swing Parameter, Table 1 .................. 3 Change to Figure 2 ........................................................................... 6 Updated Outline Dimensions ....................................................... 11 Changes to Ordering Guide .......................................................... 11 5/04Revision 0: Initial Version Rev. A Page 2 of 12