The ADN2525 laser diode driver is designed for direct modulation of packaged laser diodes having a differential resistance ranging from 5 Ω to 50 Ω. The active back-termination technique provides excellent matching with the output transmission lines while reducing the power dissipation in the output stage. The back-termination in the ADN2525 absorbs signal reflections from the TOSA end of the output transmission lines, enabling excellent optical eye quality to be achieved even when the TOSA end of the output transmission lines is significantly misterminated. The small package provides the optimum solution for compact modules where laser diodes are packaged in low pin-count optical subassemblies. The modulation and bias currents are programmable via the MSET and BSET control pins. By driving these pins with control voltages, the user has the flexibility to implement various average power and extinction ratio control schemes, including closed-loop control and look-up tables. The automatic laser shutdown (ALS) feature allows the user to turn on/off the bias and modulation currents by driving the ALS pin with the proper logic levels. The product is available in a space-saving 3 mm × 3 mm LFCSP specified from −40°C to +85°C. Applications * SONET OC-192 optical transceivers * SDH STM-64 optical transceivers * 10 Gb Ethernet optical transceivers * XFP/X2/XENPAK/XPAK/MSA 300 optical modules * SR and VSR optical links * Up to 10.7 Gbps operation * Very low power: 670 mW (IBIAS = 40 mA, IMOD = 40 mA) * Typical 24 ps rise/fall times * Full back-termination of output transmission lines * Compatible with XMD-MSA TOSA * Drives TOSAs with resistances ranging from 5 Ω to 50 Ω * PECL-/CML-compatible data inputs * Bias current range: 10 mA to 100 mA * Differential modulation current range: 10 mA to 80 mA * Automatic laser shutdown (ALS) * 3.3 V operation * Compact 3 mm × 3 mm LFCSP * Voltage input control for bias and modulation currents * XFP-compliant bias current monitor * Optical evaluation board available