VOICE SWITCHED SPEAKER-PHONE CIRCUIT
Description
UNISONIC TECHNOLOGIES CO.
, LTD
MC34018
LINEAR INTEGRATED CIRCUIT
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.
ORDERING INFORMATION
Order Number
Lead Free
Halogen Free
MC34018L-D28-T
MC34018G-D28-T
MC34018L-E28-T
MC34018G-E28-T
MC34018L-R28-T
MC34018G-R28-T
MC34018L-R28-R
MC34018G-R28-R
MC34018L-S28-T
MC34018G-S28-T
MC34018L-S28-R
MC34018G-S28-R
Package
DIP-28 SDIP-28 SSOP-28 SSOP-28 SOP-28 SOP-28
Packing
Tube Tube Tube Tape Reel Tube Tape Reel
www.
unisonic.
com.
tw Copyright © 2020 Unisonic Technologies Co.
, Ltd
1 of 8
QW-R108-006.
F
MC34018
MARKING
PACKAGE
SOP-28 SSOP-28
DIP-28 SDIP-28
PIN CONFIGURATION
RR 1 RTX 2
TXI 3 TXO 4
TLI 5 TLO 6 RLI 7 RLO 8 MCI 9 MCO 10 CP1 11 CP2 12 XDI 13 SKG 14
LINEAR INTEGRATED CIRCUIT
MARKING
28 RRX 27 R...
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