NEWS
Texas Instruments – Integrated modulator driver and limiting amplifier needs no reference clock (ONET1130EC) Texas Instruments – Integrated modulator driver and limiting amplifier needs no reference clock (ONET1130EC)
The Texas Instruments (TI) ONET1130EC is a 2.5V integrated modulator driverand limiting amplifier with transmit and receive clock and data recovery(CDR) designed to operate between 9.8Gbps and 11.7Gbps without the need fora reference clock. Optical and electrical loopback are included. CDR bypassmode can be used for operation at lower data rates and a two-wire serialinterface allows digital control of the features.
The transmit path consists of an adjustable input equalizer for equalizationof up to 300 mm (12 inches) of microstrip or stripline transmission line ofFR4 printed circuit boards, a multi-rate CDR and an output modulator driver.Output waveform control, in the form of cross-point adjustment andde-emphasis are available to improve the optical eye mask margin. Biascurrent for the laser is provided and an integrated automatic power control(APC) loop to compensate for variations in average optical power overvoltage, temperature and time is included.
The receive path consists of a limiting amplifier with programmableequalization and threshold adjustment, a multi-rate CDR and outputde-emphasis to compensate for frequency dependent loss of connectors,microstrips or striplines connected to the output of the device, Thereceiver output amplitude and loss of signal assert level can be adjusted.
The ONET1130EC contains internal analog to digital and digital to analogconverters to support transceiver management and eliminate the need forspecial-purpose microcontrollers.
The transceiver is characterized for operation from –40C to 100C casetemperatures and is available in a small footprint 4mm × 4mm, 32-pin RoHScompliant VQFN package.
