ML6674

July 1999 ML6674 ATM 155Mbps UTP Transceiver GENERAL DESCRIPTION The ML6674 is a complete monolithic transceiver for 155Mbps NRZ encoded data transmission over category 5 unshielded twisted pair (UTP) and shielded twisted pair (STP) cables. The ML6674 is compliant with the ATM 155Mbps Twisted Pair Specification. The ML6674 includes the baseline restoration function and adaptive equalization which will accurately compensate for line losses exceeding 100m of UTP. The ML6674 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 ML6674 transmit section accepts ECL 100K compatible NRZ inputs. FEATURES s Complies with ATM Forum 155Mbps twisted pair specification Integrated baseline wander correction circuit Integrated adaptive equalization Transmitter can be externally turned off (high impedence) for true quiet line Operates over 100 meters of STP or category 5 UTP Twisted Pair Cable 32-pin PLCC and TQFP s s s s s BLOCK DIAGRAM LPBK TXOFF TVCCA TVCCD RTSET1 RTSET RTSET2 TXIN+ TXIN– TPOUT+ TPOUT– SD+ SD– LINK STATUS ADAPTIVE CONTROL RXOUT+ MUX RXOUT– ADAPTIVE EQUALIZER ADAPTIVE CONTROL REFERENCE TPIN+ TPIN– RRSET1 TGNDA TGNDD RGND RRSET RRSET2 RVCCA RVCCD CMREF 1 ML6674 PIN CONFIGURATION ML6674 32-Pin PC...