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UTCMC34018 pdf datasheet (LINE
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UTC MC34018 LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
DESCRIPTION
The UTC MC34018 speaker-phone integrated circuit
incorporates the necessary functions to produce a high
quality hands-free speaker-phone system. The applications
include household and office speaker-phones, intercom
systems, hand free kit for mobile phones, and others.
FEATURES
*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 voltage regulators illuminate external regulators for
lining operation.
*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.
*Volume control function for external volume control.
*Standard 28-pin plastic DIP and SOP package.
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