DALLAS DS1864

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 ds1864s 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.