MH88632 Datasheet | Mitel Networks

Features - - - - - - - - - - Loop start and ground start capabilities Transformerless 2-4 wire conversion Programmable transmit/receive gain with 0d B defaults Programmable input impedance with 600 Ω and 900Ω defaults Programmable network balance with 600 Ω, 900Ω, and AT&T promise 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 acmodate 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 plete 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 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 Driver Bias Relay Driver Ring Ground Driver Impedance Matching Network Balance VRLY RGND Z1 Z2 Z600 Z900 NS N1 N2 NATT Figure 1 - Functional Block Diagram 2-235 TIP RING XLA XLB XLC XLD IC GRD IC IC RGND VRLY LRD BRD LRC BRC GRC AGND NATT N1 Preliminary Information 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 N2 Z900 Z1 Z2 TX RX GTX0 GTX1 GRX0 GRX1 IC Z600 NS TG RL RV FL RG VEE VDD 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 Name TIP RING XLA XLB XLC XLD IC GRD...