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Clock-phase aligner bursts forth

Sunnyvale, Calif. — Maxim Integrated Products Inc. said this is the industry's first burst-mode clock-phase aligner that acquires a signal in 13 bits — enabling best-in-class broadband passive optical network and Gbit passive optical network optical line termination designs.

Fiber to the Home (FTTH) deployments using PONs are expected to progress from the current BPON technology to next-generation GPON technology, according to Maxim. GPON specifications allow downstream continuous data transfer at 2.488 Gbits/s and upstream burst data transfer at 1.244 Gbits/s. Operating at 622 Mbits/s and at 1.244 Gbits/s within the signal's first 13 bits, the MAX3634 is suited for BPON and GPON optical line termination (OLT) receivers.

The MAX3634 can be DC-coupled to the OLT limiting amplifier. Then the device takes the upstream burst data from the limiting amplifier and provides a clock and clock-aligned resynchronized, differential output. Using the OLT system clock as a reference at 1/8th the data rate, the MAX3634 aligns to the input data and is guaranteed to acquire a signal within the first 13 bits of the burst, the company said.

The device has a high-frequency jitter tolerance of greater than 0.8 unit interval (UI). It provides continuous high-speed low-voltage pseudo emitter-coupled logic (LVPECL) clock and data outputs that meet all physical media device (PMD) level GPON specifications and are compatible with standard field-programmable gate array (FPGAs). The MAX3634 also features a LVPECL reset input and a lock-detect output.

Available in a 7mm x 7mm, 48-pin TQFN package over the extended temperature range (-40°C to +85°C), the MAX3634 is priced at $15 (1000-up, suggested resale, FOB USA). Click here for the prelim MAX3634 data sheet.

Maxim , 1-800-998-8800, www.Maxim.com.

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