TDK Semiconductor has extended the availability of its popular 78Q2120 Ethernet transceiver line - and the availability of customer designs that are based upon it - by porting the device to a new semiconductor process. The company's original design was in BiCMOS, which allowed it to use less power than its competitors and also to maintain a remarkable quality rating (99,99%). The new 78Q2120C is produced using a contemporary CMOS process, uses less power, and is expected to further improve the quality rating.
78Q2120 series transceivers are used to connect desktops, laptops, set-top boxes, game consoles and any other device that needs an Ethernet connection. Products that were designed to use older versions of the 2120 can be upgraded to use the newer technology without significant investment, re-engineering, or re-qualification of the transceiver, says TDK.
"Some of our customers have shipped more than a million of our transceivers in their products," said Rob Fleck, product line manager for networking products. "It is TDK's policy to extend the lives of products those customers are using by keeping a strategic reserve of older devices, having second sources for fabrication, and ensuring design compatibility when we port them to new technology. That is what sets TDK apart."
The TDK 78Q2120C includes an integrated Media Independent Interface, ENDECs, scrambler/descrambler, dual-speed clock recovery, and auto-negotiation functions. The transmitter includes an on-chip pulse-shaper and a low-power line driver. The receiver has an adaptive equaliser and a baseline restoration circuit required for accurate clock and data recovery. The transceiver interfaces to CAT-5 or CAT-3 unshielded twisted pair (UTP) cabling, and is connected to the line media via 1:1 isolation transformers. No external filter is required. The device is particularly well suited for applications requiring low power consumption (less than 300 mW), long cable lengths, or non-CAT-5 line segments.
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