obsolescence notice this product is obsolete. this information is available for your convenience only. for more information on zarlink?s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/
2-243 not recommended f or ne w design see mh88632b 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 w or at&t compromise balance network ? -1 version: 20hz ringing voltage ? -2 version: 50hz ringing voltage applications ? pbx ? channel bank ? intercom ? key system description the mitel MH88631-1, 2 central of?ce trunk interface circuit provides a complete audio and signalling link between audio switching equipment and a central of?ce. 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 ?lm ceramic technology to achieve high density circuit design. t r vtr+ vtr- rxin- rxin+ lpgnd ringnd rc1 rd1 rgnd cd rd2 rc2 vcc+ rg fc rv rc tg qb qe xa xb xc vdd vee rxout txin+ txin- netbal gsx vx vr gsr vcc- agnd signal detection circuitry active termination ring ground network balance relay driver 1 relay driver 2 audio section circuitry (2-4 wire) issue 4 april 1995 ordering information MH88631-1 40 pin sil package MH88631-2 40 pin sil package 0 c to 70 c figure 1 - functional block diagram MH88631 central of?ce interface (ls/gs) preliminary information
2-244 MH88631 preliminary information notes:
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