MH88630 Datasheet | Mitel Networks

Features - - Transformerless 2-4 Wire conversion Line state detection outputs: - - - forward current reverse current ring ground tip ground ringing voltage ISSUE 7 April 1995 Ordering Information MH88630 40-Pin DIL Package 0° C to 70° C Description The Mitel MH88630 Central Office Trunk Interface circuit provides a plete audio and signalling link between an audio switching equipment and a central office. The loop seize circuitry is controlled by an external input to provide either a loop start or ground start termination. The device is fabricated using thick film hybrid technology to achieve high density circuit design. Programmable audio transmit and receive gain Loop start or ground start termination Selectable 600 Ω or AT&T promise balance network Applications - - - - PBX Interface to Central Office 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 VTR+ VTRRXINRXIN+ Network Balance Active Termination Audio Section Circuitry (2 - 4 Wire) RC1 RD1 RGND CD RD2 RC2 NETBAL GSX VX VR GSR QB QE XA XB RXOUT TXIN+ TXIN- Figure 1 - Functional Block Diagram 2-215 IC T R IC IC LPGND RINGND VTR+ QE QB VTRXA XB XC RGND RC1 RD1 CD RD2 RC2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 RG FC RV RC TG VDD VEE AGND RXINRXIN+ NETBAL VX GSX TXIN+ TXINVCCVCC+ RXOUT GSR VR Preliminary Information Figure 2 - Pin Connections Pin...