MH88422

® MH88422 Line Interface Circuit Preliminary Information Features FAX and Modem interface (V29/V22 bis) Variants match German, UK & 600Ω network impedances Provides reinforced barrier to international PTT requirements Transformerless 2-4 Wire conversion Loop start operation Pulse and DTMF operation Accommodates external monitor phone Line state detection outputs: -loop current/ringing outputs Single +5V operation, low idle power (5mW) Full Duplex Suitable for power down applications MH88422-1 MH88422-2 MH88422-3 ISSUE 5 April 1995 Ordering Information 14 Pin DIL Package 14 Pin DIL Package 14 Pin DIL Package Surface Mount Options are available by adding the Suffix “S” Description The Mitel MH88422 Line Interface Circuit provides a complete audio and signalling link between audio equipment and central office. The functions provided by the MH88422 include 2-4 Wire conversion, loop seizure, ring voltage and loop current detection. The device is fabricated as thick film hybrid which incorporates various technologies for optimum circuit design, high voltage isolation and very high reliability. Variants are provided to meet German (-1) and UK (-3) line impedance (see section on Line Impedances), as well as a 600Ω variants (-2). Applications Interface to Central Office for: DAA Modem FAX Answering Machine Terminal Equipment Isolation Barrier Power Supply OptoIsolation OptoIsolation TXIN TF RLS Input Buffer OptoIsolation Ring & Loop Buffer U...