PX5420 - Multi-Rate TIA/LA Optical Receiver

Full Optical I/O information, including complete datasheets, is available to qualified customers. For further information, please send an email to OptoIO@Zarlink.com or contact your sales representative.

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 Gbps Fiber Channel standard for SANs is leading the data rate requirements for current 1 Gbps and 2 Gbps 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 Gbps. 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 Gbps 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 serial optical receiver applications
• Receiver sensitivity 10 μA_pp for 10^-12 BER at 4.25 Gbps
• Receive signal strength indicator (RSSI)
• Loss of signal indicator (LOS) Selectable squelch circuit disables output at low input levels
• Back-terminated 50-ohm CML output Selectable 250 mV or 650 mV differential output amplitude
• No external passives required for photodiode bias network Single +3.3 V supply dissipating 100 mW

Typical Applications

• Receive optical sub-assemblies (ROSA)
• 4GFC, 2GFC, 1GFC, OC-48, GbE
• SFP/SFF and proprietary optical modules

Product Availability and Packaging

Product Lead-Times when quoted are not guaranteed and are provided as a general guideline only; they may be varied from time to time without notice. Updated estimates or actual schedule commit dates will be provided at the time of order placement with Zarlink or its distributor.

Original text is here