SFP controller for optical transceiver designers
A Maxim Integrated Products product story
Edited by the Electronicstalk editorial team Jan 25, 2011
Maxim Integrated Products has introduced the DS1878, a small-form-factor pluggable (SFP+) controller with a digital laser diode driver (LDD) interface.
State machine based, the DS1878 eliminates the software-development process.
Maxim Integrated Products has introduced the DS1878, a small form factor pluggable controller with a digital laser diode driver interface
It enables efficient implementation of the SFF-8472 specification and reduces the time to market.
As the most reliable I2C controller available to optical transceiver designers - according to the company - the DS1878 enhances the reliability of SFP+ optical transceiver modules.
The DS1878 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 core feature set of SFP and SFP+ optical modules.
The DS1878 also works with the MAX3945 limiting amplifier or the MAX3946 LDD to support 10GHz 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 analogue channels: temperature, VCC and MON1 to MON4; MON3 is a fully differential input.
The DS1878 is specified over the -40 to 95C temperature range.
It uses 0.35um technology to enable the high level of integration required for SFF-8472 implementation in a 5 x 5mm, 28-pin TQFN package with exposed pad.
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