The DS1861 is a laser-driver control IC designed to reduce the production cost of fiber optics circuits by eliminating multiple temperature tests. It works with nearly all laser-driver ICs to provide automatic power control (APC) and automatic extinction ratio control (AERC), which improves the performance of the system over temperature and aging. It also has built-in monitoring capability to provide early fault detection, which can be configured to latch the IC into a shutdown condition. Settings programmed into the DS1861 are stored in password-protected EEPROM memory, which write-protects calibration data. Programming is accomplished through an I²C-compatible interface, which can also be used to read diagnostic information. Applications * Optical Transceivers * Optical Transponders * Automatic Power Control (APC) * Automatic Extinction Ratio Control (AERC) Across Temperature and Laser Aging * Works in AC-Coupled Laser Systems * Configurable Latched Automatic Shutdown with Tx-Fault and Tx-Disable * Programmable Fast Alarm Conditions * I²C-Compatible Serial Interface Allows Up to Eight Devices on the Same Serial Bus * Operates Over Wide Supply-Voltage Range * Nonvolatile Memory for Device Settings * Small, 14-Pin TSSOP Package * -40°C to +95°C Operating Temperature Range