SAN2202 Просмотр технического описания (PDF) - South African Micro Electronic Systems

Номер в каталоге

Компоненты Описание

Список матч

SAN2202

SINGLE CHIP “SPEAKERPHONE” WITH 8 - OHM LOUDSPEAKER AMPLIFIER

South African Micro Electronic Systems 

sames

SAN2202

APPLICATION NOTE

SINGLE CHIP “SPEAKERPHONE” WITH

8 - OHM LOUDSPEAKER AMPLIFIER

1 Scope

This application note describes a low-cost add-on circuit for driving an 8Ω-Loudspeaker to get a simple loudhearing

(“Speakerphone”) Telephone.

To possible ways of supplying the amplifier are shown:

SAN2202a:

SAN2202b:

Amplifier supply in shunt transistor path

Amplifier supply by power extraction circuit (SAN3020)

It can be added to any SA253x application without interfering with PTT-relevant parameters, like AC-impedance,

Sidetone cancellation or DC-mask.

2 Key Features

• Low cost additional circuit enables use of loudhearing function

• Full duplex “handsfree” operation via handset microphone and loudspeaker (at distances <2m between

telephone and user)

• Can be added to any SA253x- application

• Enables use of low cost 8Ω - Loudspeaker

• High output power with low distortion

• Entirely powered from the telephone line

• No influence of loudspeaker amplifier in AC-impedance, sidetone cancellation or DC-mask

• Loudspeaker volume adjustable by potentiometer

• Excellent sidetone cancellation of SAS253x circuits enables high loudspeaker volume without howling between

handset microphone and loudspeaker

SAN2202

PDS038-SA2531/2-001 Rev. B 21-03-00

Share Link: