AS2525F AMSCO [austriamicrosystems AG], AS2525F Datasheet

AS2525F

Manufacturer Part Number

AS2525F

Description

Single-Chip Handsfree Phone CMOS Integrated Circuit

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS2525F.pdf (27 pages)

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Single-Chip Handsfree Phone

CMOS Integrated Circuit

AS2525

Key Features

Package

Available in 44 pin TQFP.

Block Diagram

Revision 2.1

Line/speech handsfree circuit, LD/MF repertory dialler,

and tone ringer on one 44 pin CMOS chip

Operating range from 15 to 100 mA line current (down

to 5 mA with slightly reduced performance)

All significant parameters programmable with external

EEPROM

Volume control of receiver signal

Handsfree function with enhanced voice switching

Low noise (max. -72 dBmp)

Unique EMC performance

LD/MF switchable dialing with temporary MF mode

Repertory dialing with last number redial and memory

dialing (8 x 2 direct and 12 indirect)

Call restriction with PIN code

Serial interface for EEPROM and LCD driver

2-tone/3-tone ringer with ring frequency detection

300

BAL

DM/HM

DPN

STB

LED

FCI

AS2525

DEBOUNCE

–

DI DO CLK

DIALLER

CPU

SENSE

LINE

GND

CS1 CS2

MELODY

DTMF

SUPPLY

KEYBOARD (C1-4/R1-3)

PEAK

KEYSCANNING

DET.

–

FT2

General Description

The AS2525 is a CMOS mixed-mode integrated circuit for

use in feature phones, answering machines and fax

machines. It contains an analogue line interface and

speech circuit for a/b terminals, loudhearing, handsfree,

enhanced LD/MF dialler, tone ringer with dc/dc converter

and serial interface to EEPROM and LCD-driver (AS2591),

all in a 44 pin package. The circuit is fully line powered.

The AS2525 uses an external EEPROM for a 32 digit last

number redial storage and memories for 28 numbers each

containing up to 24 digits/data.

The device provides a volume control for the earpiece and

the loudspeaker. The volume can be controlled by pressing

the [V-]/[V+] keys.

The versatility of the circuit is provided by programming all

parameters through an external EEPROM. This allows easy

adaptation to various PTT requirements worldwide.

REF

austriamicrosystems

GND

SWITCHING

OSCILLATOR

NOISE

VOICE

CBN

DET.

MHz

3.58

FT1

CONVERTER

DC/DC

–

LO1

LO2

RECI

RECV

SSA

DATA SHEET

Page 1 of 27

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