PX5524 - 4 x 4 Gbps TIA/LA 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 the Internet has created increasingly higher demand for multi-Gbps I/O performance. The demand for 40+ Gbps WAN bandwidth fuels the growth of short-reach 10 Gbps infrastructures within high-end telco and datacom routers, switches, servers and other proprietary chassis-to-chassis links. The Zarlink PX5524 4 Gbps TIA/LA Receiver is a four-channel TIA/LA optical receiver designed for various 4x4 Gbps parallel optics and CWDM PMD applications. It consists of a DC-coupled transimpedance amplifier and an AC-coupled differential limiting amplifier.

The transimpedance amplifier achieves a nominal 3 GHz bandwidth over a wide range of photodiode input capacitance. Excellent channel-to-channel isolation ensures data integrity at the receiver sensitivity limits. A global signal detect circuit provides the photodiode reverse bias voltage supply and senses average photocurrent supplied to the photodiode array.

The transimpedance amplifier is AC-coupled internally to a high-gain, high-bandwidth differential limiting amplifier. The limiting amplifier provides a differential back-terminated CML output that can be used to drive 4 Gbps per channel transceivers or other CML compatible clock and data recovery circuits. The limiting amplifier features an adjustable signal detect circuit that senses optical modulation amplitude (OMA) to provide a received signal indication for each channel.

Features

• 4-channel integrated transimpedance and liming amplifier operates up to 4.25 Gbps
• 8 μA_pp receiver sensitivity for 10^-12 BER
• Single +3.3V supply dissipating 105 mW per channel
• Individual channel signal detect compares input signal strength (OMA) with adjustable threshold
• Global signal detect compares quiescent photocurrent with adjustable threshold
• Squelch automatically disables output when input signal strength falls below programmable threshold
• Serial digital interface for controlling channel enable and signal detect features
• Reconfigurable I/O provides access to serial digital interface and dedicated channel signal detect outputs
• 250-micron channel pitch matches optical ribbon fiber and photodiode arrays

Typical Applications

• 10GbE LX-4 optical modules
• 4-lane 4GFC, OC-48 VSR, Infiniband™ parallel optical modules
• Proprietary parallel optical modules and CWDM
• Proprietary 4-lane intra-system parallel optics

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.

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