Analog Devices ADN2891 Product Info

• 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

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.

Applications

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