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BL34018 Datasheet

  • BL34018

  • BL34018

  • 16頁

  • BELLING

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BL34018
1. GENERAL DESCRIPTION
The BL34018 Speakerphone integrated circuit Incorporates the necessary amplifiers
錛?/div>
attenuators
錛?/div>
and control functions to produce a high quality hands free speakerphone
system錛?/div>
Include are a microphone amplifier錛?power audio amplifier for the speaker錛?/div>
a
transmit and
receive attenuators錛宎 monitoring system for background sound level錛宎nd an attenuation control
system which responds to the relative transmit and receive levels as well as the background
level錛嶢lso included are all necessary regulated voltages for both internal and external circuitry錛?/div>
allowing line-powered operation (no additional power supplies required)錛嶢 chip select pin allows
the chip to be powered down when not in use錛嶢 volume control function may be implemented
with an external potentiometer錛嶣L34018 applications include speakerphones for household and
business use錛宨ntercom systems錛宎utomotive telephones錛宎nd others錛?/div>
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

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