The GX79474 is a low-power, high-performance, quad-channel linear driver chip designed for 800Gbps and beyond optical integrated transmitter small form factor (SFF) modules for metro and long-haul applications. The GX79474 integrates analog control and digital (through an SPI interface) control circuitry for precise, independent driving level control and monitoring. Each driver channel has a 100Ω differential AC-coupled input and 60Ω differential interface with an open-collector type output stage, suitable for InP-based and silicon photonics-based Mach-Zehnder modulators.