Product Descriptions

The LXT6155 is a high speed fully integrated transceiver designed for 155 Mbps SDH/SONET/ ATM transmission system applications. The LXT6155 provides a LVPECL interface for fiber optics modules, and a CMI interface for coax cable drive. These circuits are implemented using Level One’s proven low power 3.3V CMOS analog and digital circuits.

The transmitter incorporates a parallel-to-serial converter, a frequency multiplier PLL, CMI line encoders, and line interfaces for both coax cable and optical fiber. The receiver incorporates an adaptive equalizer, a clock recovery PLL, Loss of Signal (LOS) detector, CMI and NRZ decoders, a serial-to-parallel converter, and an SDH/SONET frame byte detector/aligner. At the system interface, the LXT6155 offers both parallel 8-bit and serial differential interfaces. The LXT6155 also operates in either Hardware stand-alone mode or Software mode. Software mode is controlled by a serial microprocessor (µP) to program formats and operating/test modes.

Product Features

 Complies with: 

—Bellcore SONET GR-253 

—ITU-T G.703/813/958 STM1 

 Two line interface formats: 

—Fiber LVPECL NRZ 

—Coax CMI 

 Transmit synthesizer PLL

 Receive clock recovery PLL 

 Adaptive CMI equalizer 

 Analog circuitry for transformer drive 

 Programmable LOS function 

 CMI encoder and decoder 

 Serial/Parallel and Parallel/Serial conversion 

 Byte alignment for SDH/SONET frames 

 Two modes of operation: 

—Microprocessor controlled; software mode 

—Stand-alone; hardware mode 

 No external crystal required. A 19.44 MHz crystal is optional 

 Low power consumption (less than 760 mW typical) 

 Operates from a single 3.3 V supply 

 64 pin LQFP package

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