Datasheet > AS2521B

AS2521B

更新时间： 2024-11-08 22:39:15

品牌	Logo	应用领域
艾迈斯 - AMSCO		电话
页数	文件大小	规格书
14页	99K
描述
Telephone Speech Circuit with Loudhearing and Handsfree

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中文翻译

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AS2521B 数据手册

Preliminary

AS2520/21/20B/21B

Telephone Speech Circuit

with Loudhearing and Handsfree

Austria Mikro Systeme International AG

General Description

Key Features

The AS2520/21/20B/21B are CMOS integrated

circuits that contain all the audio functions needed to

form a high comfort, line-powered telephone.

❑ Line/speech circuit, loudhearing, handsfree and

dc/dc converter on one 28 pin CMOS chip

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

mA with reduced performance)

❑ Soft clipping control eliminating harsh distortion

❑ Volume control of receive signal with squelch and

automatic loop gain compensation

❑ Line loss compensation pin selectable

❑ Low noise (max. - 72 dBmp)

❑ Real or complex impedance adjustable

❑ NET 4 compatible

The devices incorporate line adaptation, speech

circuit, loudhearing and handsfree - all supervised by

the novel voice and power control circuit. A switching

converter is also provided for converting the ring

signal. The interface to a dialler/controller is made

very simple to allow easy adaptation to a telecom

microcontroller.

❑ Dynamically controlled voice switching

❑ Same monitor amplifier for loudhearing, handsfree

and tone ringer

❑ Very few external components

❑ Power derived from ring signal by switching

converter during ringing

The AS2520 series incorporate volume control for the

earpiece and the loudspeaker (AS2520 digital with +/-

keys and AS2521 analogue with potentiometer). The

volume control circuit automatically compensates the

loop gain to ensure acoustic stability.

Package

Available in 28 pin SOP and DIP.

Typical Application

TELEPHONE

SPEECH CIRCUIT

HSM

WITH

LOUDHEARING,

HANDSFREE,

DC/DC CONVERTER

DIALLER

µCONTROLLER

LCD DRIVER

HFM

AS2520

Figure 1: Typical Handsfree Telephone Application

Page 1

Rev. 5.1

May 1999

12 3 4 5 6 7...14

中文翻译

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与AS2521B相关器件

型号	品牌	获取价格	描述	数据表
AS2521BP	AMSCO	获取价格	Telephone Speech Circuit with Loudhearing and Handsfree
AS2521BT	AMSCO	获取价格	Telephone Speech Circuit with Loudhearing and Handsfree
AS2521P	AMSCO	获取价格	Telephone Speech Circuit with Loudhearing and Handsfree
AS2521T	AMSCO	获取价格	Telephone Speech Circuit with Loudhearing and Handsfree
AS2522/AS2523/AS2524	ETC	获取价格	语音和免提通话IC
AS2522B	AMSCO	获取价格	Telephone Line Interface and Speakerphone Circuit
AS2522B_03	AMSCO	获取价格	Telephone Line Interface and Speakerphone Circuit
AS2522BF	AMSCO	获取价格	Telephone Line Interface and Speakerphone Circuit
AS2522BQ	AMSCO	获取价格	Telephone Line Interface and Speakerphone Circuit
AS2523	AMSCO	获取价格	Telephone Line Interface and Speakerphone Circuit