MAXIM DS1864T+

The DS1864 is an SFF - 8472 multisource agreement (MSA)-compliant laser controller/monitor that is ideal for SFP optical-transceiver module designs. It controls laser driver bias and modulation currents through a pair of temperature-controlled current-sink DACs. System diagnostics are provided by monitoring three analog inputs, VCC, and temperature through the internal temperature sensor. The device also contains all EEPROM required by the SFF - 8472 MSA, including all A0h and A2h EEPROM. The DS1864’s memory map can be configured to be compatible with both the DS1852/DS1856 and the DS1859 memory maps. Additionally, memory is secured with customer - configurable two - level password protection. Eye - safety features are integrated by three fast - trip comparators that monitor transmit - power high, transmit - power low, and bias current. The fast - trip comparators drive a FET driver output to disable the laser in the case of eye safety violation. With its integrated laser driver control, system diagnostics, eye - safety features, and internal temperature sensor, the DS1864 provides an ideal solution for SFP optical transceiver modules by improving system performance, reducing board space, and simplifying design.

• Five Monitored Channels (Temperature, VCC, MON1, MON2, MON3)
• Three External Analog Inputs (MON1, MON2, MON3)
• Support Internal and External Calibration
• Enhanced RSSI Monitoring (26dB Range, 0.5dB Accuracy)
• Scalable Dynamic Range for External Analog Inputs
• Internal Direct - to - Digital Temperature Sensor
• Alarm and Warning Flags for All Monitored Channels
• Two Linear 8 - Bit Current - Sink DACs
• Two User - Selectable Full - Scale Ranges (0.5mA or 1.5mA)
• Values Changeable Every 2℃
• Three Fast - Trip Comparators (Tx Power High, Tx Power Low, and Bias Current) for Eye Safety
• Flexible, Two Level Password Scheme Provides Three Levels of Security
• Provides All Optional and Required SFF - 8472 MSA EEPROM (Both A0h and A2h Memory)
• I2C - Compatible Serial Interface
• Operates from a 3.3V or 5V Supply
• • 40℃ to +95℃ Operating Temperature Range
• 28 - Pin TQFN Package (5mmx5mm)

• SFP Optical Transceiver Modules Laser Control and Monitoring