2.5 Gbps GPON ONU transceiver solution

Micrel’s SY87725L is a single chip programmable SERDES (Serializer/Deserializer) that supports multiple Passive Optical Network (PON) standards, and rates including asymmetric Gigabit Passive Optical Network (GPON) with data rates up to 2.5 =Gbps on the receive side, and 1.25Gbps on the transmit side. This product offers complete clock recovery and data retiming circuitry, along with an integrated 4-bit serial-to-parallel data converter, on the receive side. On the transmit side, it also includes a synthesizer with an integrated 4-bit parallel-to-serial data converter. The device is targeted at BPON/GPON/ GEPON/EPON applications in the growing Fiber-to-the-Home and Fiber-to-the-Premises markets.

The SY87725L has a 4-bit interface and a double data rate option is included to reduce the clock frequency. This allows the use of the lowest cost FPGA without a significant increase in I/O pins. This device also features a novel auto-align circuit that further simplifies the critical timing requirement. The part operates on a single 3.3V supply with 1W typical power consumption. The parallel 4-bit input/output interfaces feature LVDS I/O. It is available in lead-free (10mm x 10mm) 64-pin and EPAD-TQFP package options.

Micrel, Inc., www.micrel.com