PBL3766

September 1997 PBL 3766, PBL 3766/6 Subscriber Line Interface Circuit Description The PBL 3766 Subscriber Line Interface Circuit (SLIC) is a monolithic integrated circuit, manufactured in 75 V bipolar technology. The PBL 3766 SLIC facilitates the design of cost effective, high performance on-premises (ONS) analog line interface cards for PABX systems and terminal adapters. Small package size and few required external components result in a miniaturized design. The PBL 3766 programmable, constant current loop feed system can operate with battery supply voltages between -24 V and -58 V. The SLIC incorporates loop current and ring trip detection functions as well as a ring relay driver. The two- to four-wire and four- to two-wire voice frequency (vf) signal conversion, i.e. the hybrid function, is provided by the SLIC in conjunction with either a conventional or a programmable CODEC/filter. The PBL 3766 package is a 22 pin, plastic dual-in-line (batwing) or a 28-pin, plastic j-leaded chip carrier (PLCC). The differences between PBL 3766 and PBL 3766/6 are the specifications for balance, output offset voltage, and insertion loss. Key Features Low cost Few external components Programmable, constant current loop feed Line feed characteristics independent of battery supply variations -24 V to -58 V battery supply voltage range Detectors – programmable loop current detector – ring trip detector Ring relay driver Hybrid function with conventional or programmable CODE...