CXB1549 Datasheet | Sony Semiconductor Solutions

CXB1549Q Laser Diode Driver Description The CXB1549Q 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 max. data rate of 1.25Gbps (Min.). Along with the modulation current generator there is the laser diode bias generator which has capacity of sourcing up to 60m A (Bias). The laser diode 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 diode bias current is achieved through the APC (Automatic Power Control) circuitry. In order to avoid having a large current go through the laser diode, this IC also provides an Activity detector and Power on Reset functions for Laser Safety. The Activity detector circuit detects data edge transitions and if no data transition occur after a certain time period, then both the modulation and bias current are shutdown. The Power on Reset circuit holds the modulation and bias current off for a set period of time while the system power is applied. Additionally, this IC has an internal Duty Cycle correction circuit that can control the falling edge of the input pulse up to a maximum of 0.2ns (Min.). Features - Maximum data rate (NRZ): 1.25Gbps - Power on Reset function - Alarm and Shutdown function - Signal Duty cycle correction - Automatic Power Control (APC) for bias current - Activity detector function for laser safety - Power indicate function - Differential PECL inputs or AC coupled inputs 40 pin QFP (Plastic) Application - Gbit-ethernet: 1.25Gb/s - SONET/SDH: 622Mb/s - Fibre channel: 532Mb/s, 1.062Gb/s...