ADN2891

www.DataSheet4U.com 3.3 V, 3.2 Gbps, Limiting Amplifier ADN2891 FEATURES 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 GENERAL DESCRIPTION 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 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-8472compliant 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 tr...