CXB1818Q Datasheet | Sony Semiconductor Solutions

Laser Diode Driver Description 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 50m Ap-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 60m A (Bias). The laser diode bias current can be controlled by either a voltage or current into the bias adjust pin (Bias Adj) and the bias set pin (SBias), depending on how these pins are configured. 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 also provides an Activity detector function for laser protection. The Activity detector circuit detects data edge transitions and if no data transition occurs after a certain period, then both the modulation and bias currents are shutdown. The bias currents are shut it down by in order to pull down the output voltage of APC OP.Amp. When the automatic shutdown is conducted, it is possible to select whether the laser diode alarm output is activated or not. Additionally, this IC has the DFF for the input signal correction and the internal Duty Cycle correction circuit that can control the falling edge of the input pulse up to a maximum of 1.0ns(Min.). Features - Maximum data rate (NRZ): 622Mbps - Alarm and Shutdown function - DFF for input signal correction - Input signal Duty cycle correction - Automatic Power Control (APC) for bias current - Activity detector function for laser protection - Alarm signal mask function during shutdown - Differential PECL inputs or AC coupled inputs 40 pin QFP (Plastic) Applications - SONET/SDH: 622Mbps - Fibre channel: 531Mbps...