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Youwang - Voice Switched Speakerphone Circuit

Numéro de référence UTC34018
Description Voice Switched Speakerphone Circuit
Fabricant Youwang 
Logo Youwang 





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UTC34018 fiche technique
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UTC34018
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED
SPEAKERPHONE CIRCUIT
DESCRIPTION
The UTC34018 speakerphone integrated circuit incor-
porates the necessary amplifier, attenuators, and control
functions to produce a high quality hands-free speakerphone
system. Included are a microphone amplifier, a power audio
amplifier for the speaker, transmit and receive attenuators, a
monitoring system for background sound level, and an
attenuation control system which responds to the relative
transmit and receive levels as well as the background level.
Also included are all necessary regulated voltages for both
internal and external circuitry, allowing lining powered
operation(no additional power supplies required).A chip
select pin allows the chip to be powered down when not in
use. A volume control function may be implemented with an
external potentiometer. The UTC34018 applications include
speakerphones for household and business use, intercom
systems, automotive telephones, and others.
FEATURES
*All necessary level detection and attenuation controls for a
hand-free telephone in a single integrated circuit
*Background noise level monitoring with long time constant
*Wide operating dynamic range through signal compression
*On-chip supply and reference voltage regulation
DIP-28
*Typical 100mW output power(into 25 ohms)with
peak limiting to minimize distortion
*Chip Select pin for active/standby operation
*Linear Volume control function
*Standard 28-pin plastic DIP package
ABSOLUTE MAXIMUM RATINGS(Ta=25°C Voltages referred to pin 22)
CHARACTERISTICS
VALUE
V+ terminal Voltage (pin 16)
+12,-1.0
CS (pin 18)
+12,-1.0
Speaker amplifier Ground(pin 14)
+3.0,-1.0
VLC(pin 24)
+VCC,-1.0
Storage temperature
-65~+150
UNITS
V
V
V
V
°C
RECOMMENDED OPERATION CONDITIONS
CHARACTERISTICS
V+ terminal Voltage (pin 16)
CS (pin 18)
Icc(pin 20)
VLC(pin 24)
Receive signal(pin 27)
Microphone signal(pin 9)
Speaker amplifier ground (pin 14)
Ambient temperature
VALUE
+6.0 to +11
0 to +11
0 to 3.0
0.55VB to VB
0 to 250
0 to 5.0
-10 to +10
-20 to +60
UNITS
V
V
mA
V
mVrms
mVrms
mVdc
°C
YOUW ANG ELECTRONICS CO.LTD
1

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