BL34018 Ver la hoja de datos (PDF) - Shanghai Belling Co., Ltd.

Número de pieza

componentes Descripción

Lista de partido

BL34018

BL34018

Shanghai Belling Co., Ltd. 

BL34018

1. GENERAL DESCRIPTION

The BL34018 Speakerphone integrated circuit Incorporates the necessary amplifiers ，

attenuators ， and control functions to produce a high quality hands free speakerphone

system．Include are a microphone amplifier，a power audio amplifier for the speaker，transmit and

receive attenuators，a monitoring system for background sound level，and an attenuation control

system which responds to the relative transmit and receive levels as well as the background

level．Also included are all necessary regulated voltages for both internal and external circuitry，

allowing line-powered operation (no additional power supplies required)．A chip select pin allows

the chip to be powered down when not in use．A volume control function may be implemented

with an external potentiometer．BL34018 applications include speakerphones for household and

business use，intercom systems，automotive telephones，and others．

2. FEATURE

Voice switched speakerphone circuit.

All necessary level detection and attenuation controls for a hand-free telephone

included.

Background noise level monitoring with long time constant.

Background sound level compensation for transmit and receive levels as well as

the background level.

Wide operating dynamic range through signal compression.

On-chip supply and reference voltage regulation.

Power audio amplifier for typical 100mW output (into 25 ohms) with peak

limiting for speaker to minimize distortion.

Chip Select pin for active/stand by operation.

Linear Volume Control Function.

3. BLOCK DIAGRAM

http://www.belling.com.cn

-1-

Total 16 Pages

8/15/2006

Wrote by 2006

Share Link: