Datasheet > AS2525_1

AS2525_1

更新时间： 2024-10-01 06:37:47

品牌	Logo	应用领域
艾迈斯 - AMSCO		电话
页数	文件大小	规格书
27页	461K
描述
Single-Chip Handsfree Phone CMOS Integrated Circuit

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AS2525_1 数据手册

austriamicrosystems

Single-Chip Handsfree Phone

CMOS Integrated Circuit

AS2525

DATA SHEET

Key Features

General Description

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

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.

Volume control of receiver signal

Handsfree function with enhanced voice switching

Low noise (max. -72 dBmp)

Unique EMC performance

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.

LD/MF switchable dialing with temporary MF mode

Repertory dialing with last number redial and memory

dialing (8 x 2 direct and 12 indirect)

The device provides a volume control for the earpiece and

the loudspeaker. The volume can be controlled by pressing

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

Call restriction with PIN code

Serial interface for EEPROM and LCD driver

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

The versatility of the circuit is provided by programming all

parameters through an external EEPROM. This allows easy

adaptation to various PTT requirements worldwide.

Package

Available in 44 pin TQFP.

Block Diagram

FT2

CBN

FT1

GND

AS2525

30 Ω

LINE

SENSE

NOISE

DET.

SUPPLY

REF

–

GND

PEAK

DET.

–

VOICE

SWITCHING

LO1

LO2

PEAK

DET.

300 Ω

–

STB

SSA

RECI

BAL

RECV

DTMF

MELODY

DEBOUNCE

DM/HM

FCI

DPN

LED

CPU

DIALLER

DC/DC

KEYSCANNING

OSCILLATOR

CONVERTER

DI DO CLK

CS1 CS2

KEYBOARD (C1-4/R1-3)

3.58

MHz

Revision 2.1

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