MH88632

® MH88632 Central Office Interface Circuit Preliminary Information Features Loop start and ground start capabilities Transformerless 2-4 wire conversion Programmable transmit/receive gain with 0dB defaults Programmable input impedance with 600 Ω and 900Ω defaults Programmable network balance with 600 Ω, 900Ω, and AT&T compromise default One loop start & two ground start relay drivers Line state detection outputs Forward loop, reverse loop, ring ground, tip ground, ringing voltage +5V operation On-hook audio reception (to accommodate ANI) ISSUE 5 April 1995 Ordering Information MH88632 40 Pin SIL Package 0° C to 70° C Description The Mitel MH88632 Central Office Trunk Interface circuit provides a complete audio and signalling link between audio switching equipment and a central office. The functions provided by the MH88632 include 2-4 Wire Hybrid conversion, programmable transmit and receive gains, programmable line impedance and programmable network balance. The device is fabricated using thick film hybrid technology which incorporates various technologies for optimum circuit design and very high reliability. Applications Interface to Central Office for: PBX Key Telephone System Channel bank Voice Mail Terminal Equipment Digital Loop Carrier RING TIP VDD VEE AGND RV FL RL RG TG Status Detection XLA XLB XLC XLD LRC LRD BRC BRD GRC GRD Loop Termination Receive Gain 2-4 Wire Hybrid Transmit Gain RX GRX1 GRX0 TX GTX1 GTX0 Loop Relay D...