Preliminary Data Sheet

AS2507

1/9

July 1998

®

Austria Mikro Systeme International AG

Single Chip 2-Wire Intercom

CMOS Integrated Circuit

Key Features

pin CMOS chip

signalling and speech

parallel operation of up to 25 terminals on a

bus pair with central supply

supplied locally

Application

Entrance telephone system, intercom and data

transmission, alarm systems, toy phone

General Description

The AS2507 is a CMOS integrated circuit that

contains all the functions needed to build a 2-

wire intercom network.

The device incorporates 2/4-wire conversion

(hybrid), soft clipping for high speech quality,

FSK modem and a simple interface to a

microcontroller.

The signalling mode is selectable between

FSK modulation and burst mode.

The low standby current (typ. 2 mA) allows

several devices to listen to the 2-wire line.

The speech circuit is designed for compatibility

with commonly used handset (150

Ω earpiece

and electret microphone) with receive gain of

-6 dB and transmit gain of 32 dB (relative to

line).

Package

Available in 14 pin DIP and 16 pin SOIC

Block Diagram