3.2Gbps Adaptive Equalizer and Cable Driver

The MAX3800 is a +3.3V adaptive cable equalizer and cable driver implemented together on a single chip. It is designed for coaxial and twin-axial cable point-to-point communications applications. The driver features differential current-mode logic (CML) inputs and outputs as well as adjustable output amplitude. The equalizer includes differential CML data inputs and outputs, a loss-of-signal (active-low LOS) output, and a cable integrity monitor (CIM) output.

The adaptive cable equalizer is capable of equalizing differential or single-ended signals at data rates up to 3.2Gbps. It automatically adjusts to attenuation caused by skin-effect losses of up to 30dB at 1.6GHz. The equalizer effectively extends the usable length of copper cable in high-frequency interconnect applications.

The MAX3800 is available in a 32-pin TQFP package with exposed pad and consumes only 200mW at +3.3V. The driver can be disconnected from the power supply when it is not needed, resulting in a 40% reduction in supply current.

Applications

* Backplane and Interconnect Applications * High-Speed Links in Communications and Data Systems * SDH/SONET Transmission Equipment

* Single +3.3V Operation

* Typical Power Dissipation = 200mW at +3.3V

* Data Rates Up to 3.2Gbps

* Adjustable Cable Driver Output Amplitude

* Equalizer Automatically Adjusts for Different Cable Lengths

* 0dB to 30dB Equalization at 1.6GHz (3.2Gbps)

* Loss-of-Signal (active-low LOS) Indicator

* Cable Integrity Monitor (CIM)

* On-Chip Input and Output Terminations

* Low External Component Count

* Operating Temperature Range = 0°C to +85°C

* ESD Protection on Cable Inputs and Outputs