Features and Benefits

  • Input sensitivity: 4 mV p-p
  • 80 ps rise/fall times
  • CML outputs: 700 mV p-p differential
  • 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: 145 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 ADN2891 is a 3.2 Gbps limiting amplifier with integrated loss-of-signal (LOS) detection circuitry and a received signal strength indicator (RSSI). This part is optimized for SONET, Gigabit Ethernet (GbE), and Fibre Channel optoelectronic conversion applications. The ADN2891 has a differential input sensitivity of 4 mV p-p and accepts up to a 2.0 V p-p differential input overload voltage. The ADN2891 supports current mode logic (CML) outputs with controlled rise and fall times.

By monitoring the bias current through a photodiode, the on-chip 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 ADN2891 is available in a 3 mm × 3 mm, 16-lead LFCSP.


  • SFP/SFF/GBIC optical transceivers
  • OC-3/OC-12/OC-48, GbE, Fibre Channel (FC) receivers
  • 10GBASE-LX4 transceivers
  • WDM transponders

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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Evaluation Boards Pricing displayed is based on 1-piece.
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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.