Maxim Integrated Products (Sunnyvale, CA) has introduced the DS1878, a small form factor pluggable (SFP+) controller with a digital laser diode driver (LDD) interface. The state-machine-based device controls and monitors all functions for SFF, SFP, and SFP+ optical modules, and fully supports the SFF-8472 standard. It can be combined with a MAX3798 or MAX3799 SFP+ laser driver/limiting amplifier to provide an automatic power control (APC) loop, modulation current control, and eye safety functionality. The DS1878 also works with the MAX3945 limiting amplifier or the MAX3946 LDD to support 10 GHz applications featuring distributed feedback (DFB) or electro-absorption-modulated (EML) lasers. Laser modulation is controlled with a dedicated temperature-driven lookup table (LUT). Two additional 9-bit delta-sigma DAC outputs with 36-entry LUTs are provided. The DS1878 monitors six analog channels: temperature, Vcc, and MON1 to MON4; MON3 is a fully differential input.

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