LXT334QE

Product Summary

The LXT334QE is a quad, short-haul, PCM transceiver for 2048MHz or 1.544MHz transmission systems. Its low impdance transmit output drivers provide constant line impedance whether transmitting marks or spaces. The LXT334QE output pulse amplitudes are also constant, stabilized against supply voltage variations. The LXT334QE can be configured for balanced 100/120Ω or unbalanced 75Ω systems and exceeds the latest ETSI return loss recommendations.

Parametrics

LXT334QE absolute maximum ratings: (1)DC supply voltage, RVCC, RGND: -0.3 to 6.0V; (2)input voltage on any pin, VIN: GND-0.3 to RVCC+0.3V; (3)input voltage on RTIP/RRING, VIN: -6 to RVCC+0.3V; (4)transient latchup current on any pin, IIN: 100mA max; (5)input current on any digital pin, IIN: -10 to 10mA; (6)DC input current on TTIP, TRING, IIN: ±100mA; (7)DC input current on RTIP, RRING, IIN: ±20mA; (8)storage temeprature, Tstor: -65 to 150℃; (9)total package power dissipation: 1W.

Features

LXT334QE features: (1)Fully integrated quad, short-haul PCM transceiver for G.703 2.048 Mbps or I.431 1.544 Mbps operation; (2)Single rail supply voltage of 5 V (typical); (3)Low power consumption of 410 mW (typical); (4)Programmable G.703 transmit pulse shaping for G.703 75Ω and 120 Ω and I.431 100Ω systems; (5)High performance line drivers with constant low impedance for 20 dB return loss (typical) exceeds ETSI 300 166; (6)On-chip band gap voltage reference for stabilized, constant output amplitude; (7)High-performance receivers recover data with up to 12 dB cable attenuation; (8)Low frequency 1.544 or 2.048 MHz reference clock; (9)On-chip clock recovery function; (10)Programmable unipolar and bipolar PCM interface; (11)On-chip AMI and HDB3 encoder/decoder; (12)On-chip Driver Failure Monitoring circuit; (13)Local and remote loopback testing function; (14)Independent Loss of Signal processor for each channel conforms to ITU G.775 recommendation; (15)Small-footprint 64-pin QFP.

Diagrams