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Exar transceiver supports high data rates

Posted: 12 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:exar? xrt91l81? sonet transceiver? sdh transceiver? phy transceiver?

The XRT91L81 OC-48/STM16 PHY transceiver from Exar Corp. is capable of receiving and transmitting 2.488Gbps SONET/SDH clock and data signals, as well as supporting 2.666Gbps for applications that require forward error correction (FEC).

Available in a 160-lead BGA package, the device contains a serdes, clock multiplier unit, limiting amplifiers, and a 4-bit, OIF SFI-4 compatible 622MHz parallel interface. Application targets include add-drop multiplexers, cross-connect equipment, DWDM termination equipment, optical modules, ATM switches, multiservice switches, routers, and switch/router combinations.

The integrated limiting amplifiers allow the XRT91L81 to receive differential signals down to 10mV-pp, which provides a greater margin for routing critical high-frequency signals. The limiting amplifiers can be capacitively coupled directly to transimpedance amplifiers, needed by optical module and transponder applications.

The XRT91L81 also has an auxiliary on-chip phase/frequency detector and charge pump that when combined with an external VCXO, forms a de-jittering PLL. It can be utilized in loop-timed applications to de-jitter the recovered received clock signal or provide clean up of a noisy system clock.

The transceiver generates all transmit and auxiliary reference clocks from either a standard 155.52MHz reference clock or a 77.76MHz reference clock. Clock generation includes the 2.488GHz transmit clock, 622MHz OIF SFI-4 compliant parallel bus clock, and an auxiliary 155.52MHz clock for TFI-5 support. For FEC applications, the XRT91L81 will accept 83MHz or 166MHz references to generate the appropriate FEC rate clocks.

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