FOA2322A Datasheet, PDF (6/37 Pages) Infineon Technologies AG – 3.2 Gbi t /s Laser Driver IC for Telecom and Datacom Applications

3.2 Gbit/s Laser Driver IC for Telecom and Datacom
Applications
FOA2322A
1
Overview
FOA2322A
1.1
Features
• Data rate up to 3.2 Gbit/s
• Supply range from +3.0 V to +5.5 V
• Modulation current adjustable up to 75 mA
• Bias current adjustable up to 80 mA
• Choice between temperature compensation and integrated Two-Loop-Control of bias
and modulation current
• Integrated laser supervisor
• Monitor output for optical output power
1.2
Applications
• Fiber optics telecom and data communication systems
• SDH / SONET, Fiber Channel, Gigabit Ethernet
1.3
Technology
• Bicmos B6HFC
1.4
General
This document defines the ratings and characteristics of a laser driver circuit dedicated
for applications within telecom and datacom modules with respect to various
transmission standards and laser safety requirements. A block diagram of this circuit is
shown in Figure 1.
Modulation Control / Modulator / Input Stage
The modulator is capable of driving modulation currents up to 75 mA. There are two
modes for adjusting the modulation current:
Mode 1: The modulation current is adjusted by an external resistor (R_MOD). The IC has
an internal temperature compensation circuit for compensating the temperature
characteristic of laser diode slope efficiency. With the external resistor (R_TC) the
modulation current temperature coefficient is adjustable. The temperature input itself is
derived from chip junction temperature.
Preliminary Data Sheet
2
2001-05