Maxim Integrated DS1862AB T&R

Description
The DS1862A is a laser-driver control IC with built-in digital diagnostics designed for XFP MSA. It incorporates automatic power control (APC) and extinction ratio control through a temperature-indexed lookup table (LUT). The DS1862A monitors up to seven analog inputs, including temperature and monitor diode (MD) current, to regulate laser bias current and extinction ratio. It provides programmable alarm and warning thresholds to generate interrupts if monitored signals exceed tolerance. Calibration is provided internally with independent gain and offset scaling registers for each analog signal. Settings are stored in password-protected EEPROM memory. Programming is accomplished through an I2C-compatible interface, which can also be used to access diagnostic functionality.

Features
Implements XFP MSA requirements for digital diagnostics, serial ID, and user memory
I2C-compatible serial interface
Automatic power control (APC)
Extinction ratio control with lookup table
Seven monitored channels for digital diagnostics (five basic plus two auxiliary)
Internal calibration of monitored channels (temperature, Vcc2/3, bias current, transmitted, and received power)
Programmable quick-trip logic for turning off laser for eye safety
Access to monitoring and ID information
Programmable alarm and warning thresholds
Operates from 3.3V or 5V supply
25-ball CSBGA, 5mm x 5mm package
Internal or external temperature sensor
-40°C to 100°C operating temperature range
One 8-bit buffered DAC

Applications
Laser control and monitoring in 10Gbps optical transceiver modules (XFP)
Laser control and monitoring
Digital diagnostics in optical transmission