10/100-Mbit/s Ethernet Transceiver Uses CMOS For Low Power

Thanks to its fully CMOS architecture, the 78Q2120C 10BaseT/100BaseTX Ethernet transceiver drops power consumption to less than 300 mW. The device replaces the original 78Q2120 biCMOS version. It's designed for desktop PCs, laptops, set-top boxes, game consoles, DSL/cable modems, and any other device requiring a low-cost Ethernet port. An integrated Media Independent Interface, encoder-decoders, scrambler/descrambler, dual-speed clock recovery, and auto-negotiation functions are included. The transmitter incorporates an on-chip pulse-shaper and low-power line driver. The receiver features an adaptive equalizer and a baseline restoration circuit required for accurate clock and data recovery. The transceiver interfaces to CAT-5 or CAT-3 UTP. No external filter is required. The 78Q2120C is available now at prices just under $4 in 1000-unit quantities.