PX5420

www.DataSheet4U.com PX5420 Multi-Rate TIA/LA Optical Receiver Product Brief September 2004 Description The growing use of serial optical modules in datacenter LAN and SAN infrastructures have created a need for multi gigabit optical modules. The introduction of 4 Gb/s Fiber Channel standard for SANs is leading the data rate requirements for current 1 Gb/s and 2 Gb/s optical modules while demanding full backward compatibility. The Zarlink PX5420 multi-rate TIA/LA optical receiver provides the performance and feature set required by competitive SFF and SFP optical modules. The Zarlink PX5420 optical receiver is a single channel TIA/LA optical receiver designed for various applications to 4.25 Gb/s. It consists of a transimpedance amplifier (TIA) and an AC-coupled differential limiting amplifier (LA). The transimpedance amplifier achieves a nominal bandwidth of 3 GHz over a wide range of photodiode input capacitance. A photodiode bias current monitor allows for a simple alignment procedure. The transimpedance amplifier is AC-coupled internally to a high-gain, high-bandwidth, limiting amplifier. The limiting amplifier provides a differential back-terminated current-mode logic (CML) output that can be used to drive a 4.25 Gb/s intra module post amplifier or directly drive to the edge of the module. Full diagnostics are delivered through loss of signal, squelch, and received signal strength indicator circuits. Features Integrated transimpedance and limiting amplifier for seria...