Datasheet > AS2521P

AS2521P

更新时间： 2024-02-29 19:00:33

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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技术参数
数据手册

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AS2521P 技术参数

生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP,	针数：	28
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.82	JESD-30 代码：	R-PDSO-G28
功能数量：	1	端子数量：	28
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
认证状态：	Not Qualified	标称供电电压：	5 V
表面贴装：	YES	电信集成电路类型：	TELEPHONE SPEECH CIRCUIT
端子形式：	GULL WING	端子位置：	DUAL

AS2521P 数据手册

Preliminary

AS2520/21/20B/21B

The handset speech circuit consists of a transmit and

a receive path with mute, dual soft clipping and line

regulation (pin option). A volume control is provided

with squelch and loop gain compensation to improve

signal-to-noise ratio and to assure acoustic stability.

Functional Description

The AS252x contains all the voice circuits needed in

a high feature telephone instrument, i .e.:

line adaptation (ac impedance, dc characteristics,

2/4-wire conversion, power extraction)

Loudhearing and handsfree functions are also

provided. The loudhearing function includes an anti-

Larsen circuit to prevent acoustic howling.

handset speech circuit

The handsfree circuit has a novel voice control

system which is virtually independent of any

background noise and works in a dynamic half

duplex mode as close to full duplex as the acoustic

loop gain allows.

loudhearing with enhanced anti-Larsen

handsfree with dynamic loop gain control

switching converter

The switching converter is used to extract the

available power from the ring signal and provides a

4V supply voltage. This allows the same loudspeaker

to be used for loudhearing/handsfree and tone

ringing.

The line adaptation includes line driver, ac

impedance (return loss), 2 to 4 wire converter, dc

mask and power extraction circuit for extracting the

maximum dc power from the line to supply the whole

device and peripheral circuits.

30 W

MT or PD

L +

LINE DRIVER

MI-AMP

IMPEDANCE

SYNTESIZER

TX-AGC

POWER

EXTRACTION

MI-AMP

LEVEL

DETECTOR

LLC

VDD

RTH

LEVEL

DETECTOR

VOICE

POWER

CONTROL

GND

CONTROL

GND

LSI

RO-AMP

V^DD

Vss

VDD

300 W

AS2520/21/20B/21B

RX-AGC

ST-AMP

STB

LO-AMP

PDM

INPUT

RING

LOGIC

INTERFACE

SWITCHING

CONVERTER

Z^B

Vss

VOL

Figure 2: Block Diagramme

Rev. 5.1

Page 4

May 1999

1 2 345 6 7...14

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AS2521T	AMSCO	Telephone Speech Circuit with Loudhearing and Handsfree	获取价格
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