MH88400

Features:

• FAX and Modem interface
• Suitable for V.29 FAX & V.22 bis Data
• Allows caller identification
• Variants match German, UK, 600 & 900 network impedances
• Isolation circuitry conforms 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
        -monitor phone switch hook
• Single +5V operation


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 MH88400 Line Interface Circuit provides a complete audio and signalling link between audio
equipment and central office. The functions provided by the MH88400 include 2-4 Wire conversion, loop seizure, external monitor phone switch hook status and ringing voltage and loop current detection. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit design, high voltage isolation and very high reliability.

Variants MH88400 are provided to meet German (-1) and UK (-3) and general 600 (-2) line impedance (see section on Line Impedances).