DECEMBER 7, 2009 -- Maxim Integrated Products has introduced the DS1874, an SFP+ controller with a digital LDD interface. This device controls and monitors all functions for SFF, SFP, and SFP+ optical modules and fully supports the SFF-8472 standard.
The combination of the DS1874 with a MAX3798 or MAX3799 laser driver/limiting amplifier provides a low-cost option for APC loop control, modulation current control, and eye-safety functionality, Maxim says. The chipset eliminates the need for software development, thus reducing cost and speeding time to market, the company adds.
The DS1874 monitors six analog channels -- temperature, Vcc, and MON1-MON4, -- which can be used to meet all monitoring requirements. Laser modulation is controlled by a temperature-driven LUT to compensate for tracking error. Two DAC outputs with 36-entry LUTs are provided for additional monitoring and control functionality.
The DS1874 uses 0.35-micrometer technology to enable the implementation of all SFF-8472 functionality in its 5x5-mm, 28-pin TQFN package with exposed pad.
Maxim says the SFP+ controller is fully specified over the -40 degrees Celsius to +95 degrees Celsius temperature range. Pricing begins at $1.33 (10,000-up, FOB USA).
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