INDUSTRY’S FIRST +3.3V, 2.5Gbps LASER DRIVER WITH APC AND AMC
Note to Editor: The MAX3865 is a significant new product. It is the first +3.3V, 2.5Gbps laser driver with automatic modulation control.
SUNNYVALE, CA-December 4, 2001-Maxim introduces the MAX3865 low-power laser driver designed to modulate laser diodes at speeds up to 2.5Gbps while maintaining constant optical power output and extinction ratio over the lifetime and temperature. Programmable output levels are set through externally adjustable bias and modulation currents. Two feedback loops can be enabled to control optical power. The automatic power control (APC) loop maintains average optical power. The automatic modulation control (AMC) loop maintains constant modulation through the synchronous detection of a small pilot tone added to the modulation current. Programming the device may be accomplished with all passive support circuitry. The laser driver is fabricated with Maxim’s in-house second-generation SiGe process.
The MAX3865 has differential clock and data input signals with on-chip 50 termination resistors. Inputs can be configured for CML or other high-speed logic. An input data-retiming latch is available to reject input pattern-dependent jitter if a clock signal is available. The driver can modulate laser diodes at amplitudes up to 60mAp-p. With typical (20% to 80%) edge speeds of 110ps, the MAX3865 can supply a bias current up to 100mA. Incorrect response of the laser diode to modulation and bias is indicated by the FAIL pin. Early detection of laser degradation is available from the bias modulation current monitors included in the MAX3865.
The MAX3865 is available as an 80mil x 120mil die or a 32-pin QFN package with exposed pad. It operates from a +3.3V supply over a -40°C to +85°C temperature range. Prices start at $21.95 (1000-up, FOB USA). Evaluation kits are available.
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