ML6672*

The ML6672 is a complete monolithic transceiver for155Mbps NRZ encoded data transmission over Category 5 Unshielded Twisted Pair and Shielded Twisted Pair cables.The ML6672 is compliant with the ATM Forum 155MbpsTwisted Pair Specification. The adaptive equalizer in theML6672 will accurately compensate for line losses of upto 100m of UTP. The part requires only external 1%resistors for accurate equalization.

The ML6672 receive section consists of an equalizing filterwith a feedback loop for controlling effective line compensation. The feedback loop contains a filter anddetection block for determining the proper control signal.An ECL 100K compatible buffer at the output interfacesdirectly with ATM physical interface chips.

The ML6672 transmit section accepts ECL 100Kcompatible NRZ inputs.

Several additional functions are provided by the ML6672to simplify applications. A common-mode reference isprovided to set the input DC level for the equalizer andthe near-end transformer winding. This terminal may beused as an AC ground for the transformer center-tap ortermination resistors. A link status circuit monitors lineintegrity and provides a proper logic level output signal tointerface with the host system.

The ML6672 is implemented in a BiCMOS process. Adifferential signal path throughout minimizes the effects ofpower supply transients and noise.