PX6524

The growing use of the Internet has created increasingly higher demand for multi-Gb/s I/O performance. The demand for 100+ Gb/s WAN bandwidth fuels the growth of short-reach 40 Gb/s infrastructures within high-end telco and datacom routers, switches, servers and other proprietary chassis-to-chassis links. The Zarlink PX6524 10 Gb/s TIA/LA Receiver is a fourchannel TIA/LA optical receiver designed for various 4x10 Gb/s parallel optics and CWDM PMD applications. It consists of a DC-coupled transimpedance amplifier and an AC-coupled differential limiting amplifier.

The transimpedance amplifier PX6524 achieves a nominal 8 GHz bandwidth over a wide range of photodiode input capacitance. Excellent channelto- 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 PX6524 is AC-coupled internally to a high-gain, high-bandwidth differential limiting amplifier. The limiting amplifier PX6524 provides a differential back-terminated CML output that can be used to drive 10 Gb/s 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.