MH88422

Features:

• FAX and Modem interface (V29/V22 bis)
• Variants match German, UK & 600W 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


Application

Interface to Central Office for:
• DAA
• Modem
• FAX
• Answering Machine
• Terminal Equipment


Pinout




Specifications

	Parameter	Symbol	Min	Max	Units
1	DC Supply Voltage	VDD	-0.3	6	V
2	Storage Temperature	TS	-55	+80	°C
3	DC Loop Voltage	VBat	-100	+100	V
4	Ringing Voltage	VR	-	120	VRMS
5	Loop Current	ILoop	-	90	mA

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 MH88422 are provided to meet German (-1) and UK (-3) line impedance (see section on Line Impedances), as well as a 600W variants (-2).