MH88631 Datasheet | Mitel Networks

Features - - - - - - - - - - - - Transformerless 2-4 wire conversion Line state detection outputs - forward current - reverse current - ring ground - tip ground - ringing voltage Programmable audio transmit and receive gain Loop start or ground start termination Selectable 600 Ω or AT&T promise balance network -1 version: 20Hz Ringing Voltage -2 version: 50Hz Ringing Voltage ISSUE 4 April 1995 Ordering Information MH88631-1 MH88631-2 40 Pin SIL Package 40 Pin SIL Package 0° C to 70° C Description The Mitel MH88631-1, 2 Central Office Trunk Interface circuit provides a plete audio and signalling link between audio switching equipment and a central office. The loop seize circuitry is controlled by an external input to provide either a loop start of ground start termination. The device is fabricated using thick film ceramic technology to achieve high density circuit design. Applications - - - - PBX Channel bank Inter Key System RG FC RV RC TG LPGND RINGND VCC+ VCC- AGND Signal Detection Circuitry Ring Ground Relay Driver 1 Relay Driver 2 RC1 RD1 RGND CD RD2 RC2 NETBAL Network Balance VTR+ VTRRXINRXIN+ Active Termination Audio Section Circuitry (2-4 Wire) GSX VX VR GSR QB QE XA XB XC VDD VEE RXOUT TXIN+ TXIN- Figure 1 - Functional Block Diagram 2-225 LPGND VDD RINGND T R VTRVTR+ XC XA QE AGND RXIN+ RXINVEE TG RC RV FC RG...