6.25Gbps, 1.8V PC Board Equalizer

The MAX3785 6.25Gbps equalizer operates from a single 1.8V supply and compensates for transmission-medium losses encountered with FR-4 transmission lines. Optimized for low-voltage, high-density, DC-coupled interconnections between the line card and switch card, the MAX3785 enables a system upgrade path while maintaining a legacy rate of 2.5Gbps to 3.125Gbps. Roughly the size of two 0603 passive components, the MAX3785 easily provides placement and routing flexibility.

The MAX3785 is composed of an equalizer, limiting amplifier, and output driver. For data rates of 3.2Gbps and lower, the MAX3785 equalizes signals for spans up to 40in of FR-4 board material. For data rates up to 6.25Gbps, the MAX3785 compensates for 30in of FR-4 board material. The MAX3785 is coding independent, functioning equally well for 8b/10b or scrambled signals.

The MAX3785 features DC-coupled current-mode logic (CML) data inputs and outputs. It is packaged in a tiny 1.5mm x 1.5mm chip-scale package (UCSP™) and a 6-pin TDFN package.

Applications

* Double IEEE 802.3ae XAUI * Double STM-16/OC-48 * HSBI for ≤ 6.4Gbps

* Single 1.8V Supply

* Very Low Power, 60mW

* Spans 30in with FR-4 at 6.25Gbps

* Operates from 1.0Gbps to 6.4Gbps

* Coding Independent, 8b/10b or Scrambled

* DC-Coupled CML Inputs and Outputs

* Small 1.5mm x 1.5mm Footprint