The DS1862 is a closed-loop laser-driver control IC with built-in digital diagnostics designed for XFP MSA. The laser control function incorporates average power control (APC) and allows extinction ratio control through a temperature indexed look-up table (LUT). The DS1862 monitors up to seven analog inputs, including temperature and monitor diode (MD) current, which are used to regulate the laser bias current and extinction ratio. Warning and alarm thresholds can be programmed to generate an interrupt if monitored signals exceed tolerance. Calibration is also provided internally using independent gain and offset scaling registers for each of the monitored analog signals. Settings such as programmed calibration data are stored in password-protected EEPROM memory. Programming is accomplished through an I2C-compatible interface, which can also be used to access diagnostic functionality.
The DS1862 is a closed‑loop laser‑driver control IC designed for XFP MSA optical transceiver modules. It provides automatic power control, extinction‑ratio control via a temperature‑indexed look‑up table, and monitors up to seven analog inputs such as temperature and monitor‑diode current.
The device features an I²C‑compatible serial interface, programmable alarm thresholds, internal calibration registers, and operates from a 3.3 V or 5 V supply in a 25‑pin CSBGA package. Detailed electrical characteristics, timing diagrams, and package information are provided for system designers.
| Operating Temperature Range | -40°C to +100°C |
|---|---|
| Package Type | 25‑Pin CSBGA, 5 mm × 5 mm |
| Monitored Channels | 7 (five basic plus two auxiliary) |
| IBIASSET Current Range | 0.01 mA to 1.50 mA |
| SCL Clock Frequency | Up to 400 kHz |
The device operates from –40 °C to +100 °C.
It can monitor up to seven analog inputs.