OQ2545HP

Product Summary

The OQ2545HP is a laser driver. The OQ2545 is a driver IC intended to be used with a directly modulated laser diode or with an Electro Absorption Modulator (EAM) in SDH/SONET 2.5 Gbits/s optical transmission systems. The IC features differential data inputs. Loop mode inputs are provided for system testing, along with an output for continuous monitoring. In addition, the OQ2545HP features differential clock inputs for internal retiming resulting in a better jitter performance. The IC has bias and modulating current outputs, the levels of which can be set separately. As an additional safety measure, the active HIGH-level input for automatic laser shutdown (pin ALS) can be used to switch off the laser modulation and bias currents. Although the IC is intended for 2.5 Gbits/s optical transmission systems, it can be used in any application requiring high current drive at high frequencies. The IC is transparent from input to output.

Parametrics

OQ2545HP absolute maximum ratings: (1)supply voltage for TTL interface : -0.5 to +6.0 V; (2)supply voltage for digital section : -6.0 to +0.5 V; (3)supply voltage for analog section : -7.5 to +0.5 V; (4)DC voltage on pins DIN, DINQ, DLOOP, DLOOPQ, CIN, CINQ, CLOOP and CLOOP : -1.0 to +0.5 V; (5)pins MON and MONQ : -2.0 to +0.5 V; (6)pins ALS and ENL : -0.5 to VCC + 0.5 V; (7)pins EFADJ, APADJ, SIMOD and SIBIAS : VEE2 - 0.5 to 0.5 V; (8)pins SMOD and BGCAP : VEE1 - 0.5 to 0.5 V; (9)DC current on pins LA and LAQ : 80 mA; (10)pin IBIAS : 110 mA; (11)pins MON and MONQ : 20 mA; (12)pin DIOA : 10 mA; (13)junction temperature : 150 ℃; (14)storage temperature : -65 to +150 ℃.

Features

OQ2545HP features: (1)Differential 50 W inputs for direct connection to Current-Mode Logic (CML) outputs; (2)Internal retiming to minimize jitter (OQ2545HP only); (3)Input clock phase margin of 320° at 2.5 Gbits/s (OQ2545HP only); (4)RF output current sinking capability of 60 mA; (5)Bias output current sinking capability of 100 mA; (6)TTL compatible control inputs; (7)Loop mode for system testing; (8)Continuous output monitoring; (9)Power dissipation <1500 mW (for typical application); (10)Low cost LQFP48 plastic package.

Diagrams