The HXT44120 is a single channel, low power, Linear PAM4 Directly-Modulated Laser (DML) driver for LR applications. It supports signaling rates up to 28GBuad or 56Gbps in PAM4 modulation. In conjunction with an individual DML, the HXT44120 handles the complete electrical-to-optical conversion, including CML input with equalization, laser bias and modulations, laser power control and supervision.

• 290mW power dissipation per channel
• Supports up to: I_MOD = 60mAPP and I_BIAS = 60mA with VCC = 3.3V for lower power
• Integrated 12-bit ADC with 6-channel analog multiplexor front-end
• Programmable 8-bit laser modulation and bias current control
• Integrated bias monitor, transmit and receive power monitor capability
• Automatic power control (APC)
• Programmable input LOS and Squelch function with disable, transmit disable, and transmit fault indication
• Programmable input CTLE
• Integrated temperature sensor and input for external module temperature sensor
• Interrupts with user selectable mask control
• Input polarity inversion
• Laser disable for I_MOD and I_BIAS
• Integrated OTP for calibration
• 2-wire interface control