|
BL34018 Datasheet, PDF (1/16 Pages) SHANGHAI BELLING CO., LTD. – BL34018 | |||
|
BL34018
1. GENERAL DESCRIPTION
The BL34018 Speakerphone integrated circuit Incorporates the necessary amplifiers ï¼
attenuators ï¼ and control functions to produce a high quality hands free speakerphone
systemï¼Include are a microphone amplifierï¼a power audio amplifier for the speakerï¼transmit and
receive attenuatorsï¼a monitoring system for background sound levelï¼and an attenuation control
system which responds to the relative transmit and receive levels as well as the background
levelï¼Also included are all necessary regulated voltages for both internal and external circuitryï¼
allowing line-powered operation (no additional power supplies required)ï¼A chip select pin allows
the chip to be powered down when not in useï¼A volume control function may be implemented
with an external potentiometerï¼BL34018 applications include speakerphones for household and
business useï¼intercom systemsï¼automotive telephonesï¼and othersï¼
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
|
▷ |