Product Summary

The CXB1818Q is a high-speed monolithic Laser Diode Driver/Current Switch with ECL/PECL input level. Open collector outputs are provided at the output pins (Q, QBX) and have the capacity of driving modulation current of 50mAp-p at a maximum data rate of 622Mbps. Along with the modulation current generator there is the laser diode bias current generator which has capacity of sourcing up to 60mA (Bias). Control of the bias current is achieved through the APC (Automatic Power Control) circuit. In order to avoid having a large current go through the laser diode, this IC CXB1818Q also provides an Activity detector function for laser protection. The applications of the CXB1818Q include SONET/SDH: 622Mbps and Fibre channel: 531Mbps.

Parametrics

CXB1818Q absolute maximum ratings: (1)Supply voltage, VCC – VEE: –0.3 to +6.0 V; (2)Input voltage, VIN: VEE to VCC V; (3)Differential input voltage, |VD – VDB|: 0 to 2.5 V; (4)Bias output current: 0 to 80 mA; (5)SBias input/output current: 0 to 5 mA; (6)Bias control current, IBset (Ibiasadj): 0 to 5 mA; (7)Bbias control voltage, VBset (Vbiasadj); 0 to 3 V; (8)Modulation output current: 70 mA; (9)Modulation adjust current, IQset (Idrvadj): 0 to 15 mA; (10)Storage temperature, Tstg: –65 to +150℃; (11)Recommended Operating Conditions DC supply voltage, VCC – VEE: 3.14 to 3.46 V; (12)Operating ambient temperature, Ta: –40 to +85℃.

Features

CXB1818Q features: (1)Maximum data rate (NRZ): 622Mbps; (2)Alarm and Shutdown function; (3)DFF for input signal correction; (4)Input signal Duty cycle correction; (5)Automatic Power Control (APC) for bias current; (6)Activity detector function for laser protection; (7)Alarm signal mask function during shutdown; (8)Differential PECL inputs or AC coupled inputs.

Diagrams

CXB1818Q block diagram

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