TF1006A

Data Sheet June 1999 LG1625AXF Laser Driver Features s s s s s Description The LG1625AXF is a gallium-arsenide (GaAs) laser diode driver to be used with direct modulated laser diodes in high-speed nonreturn-to-zero (NRZ) transmission systems. The device is made in a high-performance 0.9 µm gate GaAs heterojunction FET technology that utilizes high-density MIM capacitors, airbridge interconnect, and NiCr film precision resistors. The device contains three cascaded stages, operates with a single –5.2 V power supply and accepts ECL level inputs. Voltages control the modulated output current and laser prebias current. The LG1625AXF is available in a 24-lead hermetic, gullwing package. A test fixture (TF1006A) with SMA connectors is available to allow quick evaluation of the LG1625AXF. High data-rate laser diode/LED driver Adjustable output current Operation up to 3 Gbits/s Single –5.2 V power supply 90 ps rise and fall times Applications s s s SONET/SDH transmission systems SONET/SDH test equipment Optical transmitters GND MK MK VPRE VIN VTH LG1625AXF IOUT VMOD VSS3 VSS2 VSS1 5-7865(F) Figure 1. Functional Diagram LG1625AXF Laser Driver Data Sheet June 1999 Pin Information GND MK MK VMOD VPRE + – + VIN 50 Ω VTH – + – 25 Ω IOUT VSS1 VSS3 VSS2 5-7866(F) Figure 2. LG1625AXF Die Block Diagram VMOD VSS1 VSS1 VSS3 20 24 23 22 21 19 VSS2 VTH VSS1 VIN GND GND GND VSS1 1 2 3 18 17 16 VPRE GND IOUT GND GND VSS1 LG1625AXF 4 5 6 10 11 12 MK 7 8 9 15 14 1...