LG1626DXC

Data Sheet February 1999 LG1626DXC Modulator Driver Features s s s s s s s s Functional Description The LG1626DXC is a gallium-arsenide (GaAs) intergrated circuit used to provide voltages to drive optical modulators in high-speed non-return-to-zero (NRZ) transmission systems. The device is made in a highperformance 0.9 µm gate GaAs hetero-junction FET technology that utilizes high-density MIM capacitors, airbridge interconnect, and NiCr film precision resistors. The device contains four cascaded stages, operates with a single –5.2 V power supply, and accepts ECL 100K level inputs. The output is an open drain designed to drive 50 Ω loads. Voltages control the output modulation amplitude and modulator dc offset. A –2.5 V band-gap reference is required for stable operation over temperature and varying power supply voltage. The LG1626DXC is available in a 24-lead hermetic, gull-wing package. High data-rate optical modulator driver Adjustable output voltage up to 3 Vp-p (RL = 50 Ω) Adjustable modulator dc offset Operation up to 3 Gbits/s Single ended or differential inputs Single –5.2 V power supply 90 ps rise and fall times Enable control Applications s s s SONET/SDM transmission systems SONET/SDM test equipment Optical transmitters GND BG2P5 MK VTH MK VDC-ADJ VIN VOUT VIN VOUT-DC VTH VMOD VSS3 VSS2 VSS1 5-6549(F) MOD_E Figure 1. Functional Diagram LG1626DXC Modulator Driver Data Sheet February 1999 Pin Information GND MK MK VMOD VDC-ADJ VTH 50 Ω VIN VIN 50 Ω VTH + ...