AS2507 Datasheet, PDF (1/9 Pages) ams AG – SINGLE CHIP 2-WIRE INTERCOM CMOS INTEGRATED CIRCUIT

Preliminary Data Sheet
®
Austria Mikro Systeme International AG
Key Features

Line/speech circuit and signalling on one 14
pin CMOS chip

Only 2 wires needed for power supply,
signalling and speech

Soft clipping to avoid harsh distortion

Fully integrated 2/4 wire conversion

Side tone cancellation

Low noise

Signalling with FSK modem

Low standby power consumption allows
parallel operation of up to 25 terminals on a
bus pair with central supply

Parallel operation of up to 70 terminals if
supplied locally

Controllable via simple µC interface

Very few external components
Application
Entrance telephone system, intercom and data
transmission, alarm systems, toy phone
Block Diagram
AS2507
Single Chip 2-Wire Intercom
CMOS Integrated Circuit
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 (150Ω 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
1/9
July 1998