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 m 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 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.