4‑Channel, 128Gbaud Linear Optical Modulator Driver with 2Vpp Single‑Ended Output

The RRT75472 is a low-power, high-performance, quad-channel linear driver chip that is designed for 800G, 1.2T and beyond optical integrated transmitter small-form factor (SFF) modules for metro and long-haul applications.

The device integrates quad-lanes of driver with serial peripheral interface (SPI) circuitry for DC controls and monitoring purposes on a single die. Each channel of driver has 100Ω differential AC-coupled input and a single-ended output with a back-terminated output stage. The output stage allows external AC-coupled interface with optical modulators having a wide characteristic impedance range from 30Ω to 50Ω. The linear output voltage of 2.0Vpps is suitable for the LiNbO3 optical modulators with multi-level QAM modulation.