GigOptix has announced a single and quad channel limiting 28Gbps direct modulated laser (DML) driver chipset for 25Gbps and 100Gbps Ethernet data center and cloud apps. The DML drivers enable lower-power 28Gbps SFP28+ and 100Gbps QSFP28+ Ethernet modules or active optical cable (AOC) options, as well as providing 32GFC and 128GFC support for fiber channel storage.
The HXT42100 and HXT42400 DML drivers are based on tan architecture that affords high integration, low-power dissipation and small form factor. Voltage supply operation is as low as 2.5V, with modulation and bias currents of 50mA and 50mA respectively, enabling low-power modules. A single channel operating at 2.5V dissipates less than 200mW of chip power. Digital analog converters are not required for operation.
A high level of integration is made possible by incorporating the modulation, bias and pulse shaping DAC into the devices. An integrated I2C interface is used for control, monitoring, fault and status detection. The interface enables control of signal detect and squelch, bandwidth adjust, mask-able fault and interrupt generation, internal temperature monitor selection, channel polarity inversion and programmable CTLE input equalization.
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