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SHANGHAI BELLING - high quality hands free speakerphone system

Numéro de référence BL34018
Description high quality hands free speakerphone system
Fabricant SHANGHAI BELLING 
Logo SHANGHAI BELLING 





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BL34018 fiche technique
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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
systemInclude are a microphone amplifiera power audio amplifier for the speakertransmit and
receive attenuatorsa monitoring system for background sound leveland an attenuation control
system which responds to the relative transmit and receive levels as well as the background
levelAlso 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 useA volume control function may be implemented
with an external potentiometerBL34018 applications include speakerphones for household and
business useintercom systemsautomotive telephonesand 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

PagesPages 16
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