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Data Sheet

AS2533...6

廬

Austria Mikro Systeme International AG

Multi-Standard CMOS Single Chip

Telephone IC with Dual Soft Clipping

General Description

The AS253x is a CMOS integrated circuit that contains

all the functions needed to form a high performance

electronic telephone.

The device incorporates LD/MF repertory dialling, melody

generation, ring frequency discrimination and a high

quality line/speech circuit.

A RAM is on chip for a 31 digit last number redial and

memories (not AS2534) each containing up to 21 digits/

data. The sliding cursor procedure makes the LNR

function easy to use under various PABX systems. Also

centrex keys (not AS2535) are provided.

The device incorporate a volume control for the earpiece.

The volume can be controlled by the VOL key (+ 5.4 dB)

or by the 鈥?+ keys (+8.1 dB/-5.4 dB in 5 steps).

The versatility of the circuit is provided by pin options

and a few external components. This allows easy

adaptation to different PTT requirements.

Key Features

u

Line/speech circuit, LD/MF repertory dialler and

tone ringer on one 28 pin CMOS chip

u

Operating range from 13 to 100 mA (down to 5 mA

with reduced performance)

u

Soft clipping to avoid harsh distortion

u

Volume control of receive signal

u

Line loss compensation selectable by pin option

u

Low noise (max. - 72 dBmp)

u

Real or complex impedance

u

NET 4 compatible

u

LD/MF switchable dialling

u

Pacifier tone during programming

u

31 digit last number redial

u

Repertory memories (not AS2534), 4 direct/10

indirect (AS2533/6), 12 direct (AS2535)

u

Repeat dialling by busy or engaged (not AS2535)

u

Sliding cursor protocol with comparison

u

Pause key for access pause or wait function

u

3 flash keys, 100 ms, 280 ms and 375/600 ms

u

On chip MF filter (CEPT CS 203 compatible)

u

Ring frequency discrimination

u

3-tone melody generator

Package

Available in 28 pin SOIC or DIP.

Block Diagramme

La

Z2

Z1

Z

BAL

Lb

LI

CS

CI

LS

RI

STB

A

GND

LED

RO

LINE ADAPTATION

POWER EXTRACTION

DC MASK

LINE

CURRENT

SENSE

SOFT CLIP

AGC

M2

M1

V

DD

V

DD

Vss

AS253x

MELODY

SEQUENCER

TONE

GENERATOR

MUTE

MO

R4

R3

RAM

DIALLER

R2

R1

FCI

RING

FREQUENCY

DISCRIMINATION

CONTROL

LOGIC

OSC

HS/DP

LLC

OSC

3.58

MHz

MFL

MODE

C1

C2

C3

C4

LLC Hi

LLC Lo

LLC Off

A

GND

KEY

PAD

Rev. 7

1

July 1998

next

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