Overview

Features and Benefits

  • Input sensitivity: 3.5 mV p-p 
  • 70 ps rise/fall times 
  • CML outputs: 750 mV p-p differential 
  • Bandwidth selectable for multirate 1×/2×/4× FC modules 
  • Optional LOS output inversion 
  • Programmable LOS detector: 3.5 mV to 35 mV 
  • Rx signal strength indicator (RSSI) 
    • SFF-8472-compliant average power measurement 
  • Single-supply operation: 3.3 V 
  • Low power dissipation: 160 mW 
  • Available in space-saving, 3 mm × 3 mm, 16-lead LFCSP 
  • Extended temperature range: −40°C to +95°C 
  • SFP reference design available

Product Details

The ADN2892 is a 4.25 Gbps limiting amplifier with integrated loss of signal (LOS) detection circuitry and a received signal strength indicator (RSSI). This part is optimized for Fibre Channel (FC) and Gigabit Ethernet (GbE) optoelectronic conversion applications. The ADN2892 has a differential input sensitivity of 3.5 mV p-p and accepts up to a 2.0 V p-p differential input overload voltage. The ADN2892 has current mode logic (CML) outputs with controlled rise and fall times.

The ADN2892 has a selectable low-pass filter with a −3 dB cutoff frequency of 1.5 GHz. By setting BW_SEL to Logic 0, the filter can limit the relaxation oscillation of a low cost CD laser used in a legacy 1 Gbps FC transmitter. The limited BW also reduces the rms noise and in turn improves the receiver optical sensitivity for a lower data rate application, such as 1× FC and GbE.

By monitoring the bias current through a photodiode, the onchip RSSI detector measures the average power received with 2% typical linearity over the entire valid input range of the photodiode. The on-chip RSSI detector facilitates SFF-8472-compliant optical transceivers by eliminating the need for external RSSI detector circuitry.

Additional features include a programmable loss-of-signal (LOS) detector and output squelch. The ADN2892 is available in a 3 mm × 3 mm, 16-lead LFCSP.

Applications

  • 1×, 2×, and 4× FC transceivers 
  • SFP/SFF/GBIC optical transceivers 
  • GbE transceivers 
  • Backplane receivers

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.