UNISONIC TECHNOLOGIES CO., LTD

MC34018

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2005 Unisonic Technologies Co., Ltd

QW-R108-006,C

VOICE SWITCHED

SPEAKER-PHONE CIRCUIT

DESCRIPTION

The UTC MC34018 speaker-phone integrated circuit includes all

the active circuitry and control functions to implement a high quality

hands-free telephone system. The circuit includes a microphone

amplifier, a speaker amplifier, level detectors, a background sound

level monitoring system in both the transmit and receive channels

and an attenuation system which can control the transmit and

receive levels as well as the background level.

The applications include household and office speaker-phones,

intercom systems, hand free kit for mobile phones, and others.

FEATURES

* Chip Select pin for Power conservation (active/standby mode).

* Integrated all necessary active circuitry for a hand-free telephone

into one single chip.

* Operating under wide dynamic range through signal compression

technology.

* Build-In voltage regulators illuminate external regulators for lining

operation.

* Monitoring system for background noise level.

* Background sound level compensation for transmit and

receive levels as well as the background level.

* Power audio amplifier for typical 100mW output (into 25Ω) with

peak limiting for speaker to minimize distortion.

* Volume control function for external volume control circuit.

*Pb-free plating product number:MC34018L

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

Package

Packing

MC34018-D28-T

MC34018L-D28-T

DIP-28

Tube

MC34018-E28-T

MC34018L-E28-T

SDIP-28

Tube

MC34018-R28-R

MC34018L-R28-R

SSOP-28

Tape Reel

MC34018-R28-T

MC34018L-R28-T

SSOP-28

Tube

MC34018-S28-R

MC34018L-S28-R

SOP-28

Tape Reel

MC34018-S28-T

MC34018L-S28-T

SOP-28

Tube

MC34018L-D28-T

(1)Packing Type

(2)Package Type

(3)Lead Plating

(1) R: Tape Reel, T: Tube

(2) D28: DIP-28, E28: SDIP-28, S28: SOP-28,

R28: SSOP-28

(3) L: Lead Free Plating, Blank: Pb/Sn