AS2525 datasheet(1/26 Pages) AMSCO

部件名	AS2525

功能描述	Single-Chip Handsfree Phone CMOS Integrated Circuit

PDF	26 Pages

Scroll/Zoom	100%

制造商	AMSCO [ams AG]

网页	http://www.ams.com

标志

1 / 26 page

Preliminary

AS2525

Rev. 1.3

Page 1

May 1999

Key Features

q

q Line/speech handsfree circuit, LD/MF repertory

dialler, and tone ringer on one 44 pin CMOS chip

q

q Operating range from 15 to 100 mA line current

(down to 5 mA with slightly reduced performance)

q

q All significant parameters programmable with

external EEPROM

q

q Volume control of receiver signal

q

q Handsfree function with enhanced voice switching

q

q Low noise (max. -72 dBmp)

q

q Unique EMC performance

q

q LD/MF switchable dialling with temporary MF

mode

q

q Repertory dialling with last number redial and

memory dialling (8 x 2 direct and 10 indirect)

q

q Call restriction with PIN code

q

q Serial interface for EEPROM and LCD driver

q

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

Block Diagramme

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 31 digit

last number redial storage and memories for 26

numbers each containing up to 21 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.

Package

Available in 44 pin TQFP.

CS

SS

LI

VPP

LS

+

–

+

–

+

–

+

VSS

30

Ω

RI

STB

300

Ω

ZBAL

AGND

VDD

–

+

VPP

M1

M2

M3

M4

LO1

LO2

VSSA

RECI

RECV

RO

NOISE

DET.

LINE

SENSE

PEAK

DET.

VOICE

SWITCHING

PEAK

DET.

DTMF

MELODY

DEBOUNCE

CPU

DIALLER

DC/DC

CONVERTER

OSCILLATOR

KEYSCANNING

CM

KEYBOARD (C1-4/R1-3)

HS

HF

DM/HM

FCI

DPN

LED

DI DO

CLK

CS1 CS2

VSS

CI

SUPPLY

VREF

VDD

AGND

FT2

CBN

FT1

AS2525

3.58

MHz

Austria Mikro Systeme International AG

Single-Chip Handsfree Phone

CMOS Integrated Circuit

类似零件编号 - AS2525

制造商	部件名	数据表	功能描述
ams AG	AS2525	461Kb / 27P	Single-Chip Handsfree Phone CMOS Integrated Circuit
	AS2525B	836Kb / 28P	Single-Chip Handsfree Phone CMOS Integrated Circuit
	AS2525F	461Kb / 27P	Single-Chip Handsfree Phone CMOS Integrated Circuit
	AS2525F	836Kb / 28P	Single-Chip Handsfree Phone CMOS Integrated Circuit
	AS2525Q	461Kb / 27P	Single-Chip Handsfree Phone CMOS Integrated Circuit

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