ML6672

December 1998 ML6672* ATM UTP Transceiver GENERAL DESCRIPTION The ML6672 is a complete monolithic transceiver for 155Mbps NRZ encoded data transmission over Category 5 Unshielded Twisted Pair and Shielded Twisted Pair cables. The ML6672 is compliant with the ATM Forum 155Mbps Twisted Pair Specification. The adaptive equalizer in the ML6672 will accurately compensate for line losses of up to 100m of UTP. The part requires only external 1% resistors for accurate equalization. The ML6672 receive section consists of an equalizing filter with a feedback loop for controlling effective line compensation. The feedback loop contains a filter and detection block for determining the proper control signal. An ECL 100K compatible buffer at the output interfaces directly with ATM physical interface chips. The ML6672 transmit section accepts ECL 100K compatible NRZ inputs. Several additional functions are provided by the ML6672 to simplify applications. A common-mode reference is provided to set the input DC level for the equalizer and the near-end transformer winding. This terminal may be used as an AC ground for the transformer center-tap or termination resistors. A link status circuit monitors line integrity and provides a proper logic level output signal to interface with the host system. The ML6672 is implemented in a BiCMOS process. A differential signal path throughout minimizes the effects of power supply transients and noise. FEATURES s s s s s Complies with ATM Forum 155Mbps Tw...