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PDF U4082B Data sheet ( Hoja de datos )
| Número de pieza | U4082B | |
| Descripción | VOICE SWITCHED SPEAKER-PHONE CIRCUIT | |
| Fabricantes | Unisonic Technologies | |
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UNISONIC TECHNOLOGIES CO., LTD
U4082B
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED
SPEAKER-PHONE CIRCUIT
DESCRIPTION
As a voice switched speaker-phone integrated circuit, the UTC
U4082B includes the necessary amplifiers, attenuators, level
detectors and control algorithm.
To form the UTC U4082B’s internal circuit, there is an internal
microphone amplifier with adjustable gain and mute control, internal
transmit and Receive attenuators (operate in a complementary
manner), level detectors at both input and output of both attenuators,
and background noise monitors for both the transmit and receive
channels.
The dial tone can be pretended from being attenuated by the
receive background noise monitor circuit by a dial tone detector.
There are also two line driver amplifiers which can be used to form a
hybrid network in conjunction with an external coupling transformer. A
high-pass filter can be used for other filtering functions, and especially
to filter out 60Hz noise in the receive channel.
The UTC U4082B which requiring typically 5mA may be operated
from a power supply, or it can be powered from the telephone line.
FEATURES
* Attenuator gain range: 52dB (between Transmit and Receive)
* For line-powered applications : 3~6.5V low voltage operation
* For improved sensitivity :4-point signal sensing
* For Transmit and Receive paths: background noise monitors
* External resistors set microphone amplifier gain
* Mute function included
* Chip disable: active or standby operation
* During dial tone presence: dial tone detector to inhibit receive idle
mode
ORDERING INFORMATION
Ordering Number
Lead Free Plating
Halogen Free
U4082BL-D28-T
U4082BG-D28-T
U4082BL-S28-T
U4082BG-S28-T
U4082BL-S28-R
U4082BG-S28-R
Package
DIP-28
SOP-28
SOP-28
DIP-28
SOP-28
Packing
Tube
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 13
QW-R108-020.A
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UNISONIC TECHNOLOGIES CO., LTD
U4082B
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Supply Voltages
V+ Supply Current
CD Input Resistance
CD Input Voltage
High
Low
VB Output Voltage
VB Output Resistance
VB Power Supply Rejection Ratio
ICC
RCD
VCDH
VCDL
VB
ROVB
PSRR
VCC=6.5V, CD=0.8V
VCC =6.5V, CD=2V
VCC =VCD=6.5V
VCC =3.5V
VCC =5V
IVB=1mA
CVB=220µF, f=1kHz
Attenuators
RX Mode, RXI=150mVrms
Receive Attenuator
Gain
(f=1kHz, VLC=VB)
RX Mode, RXI=150mVrms
Gain Change
AGC Gain Change
Idle Mode, RXI=150mVrms
RX to TX Mode Range
Volume Control Range
RXO DC Voltage
ΔRXO DC Voltage
RXO High Voltage
RXO Low Voltage
RXI Input Resistance
GRX
GRX
ΔGRX1
ΔGRX2
GRXI
ΔGRX3
VCR
VRXO
ΔVRXO
VRXOH
VRXOL
RRXI
VCC=5V
VCC =3.5V
VCC =3.5V vs. VCC =5V
VCC =3.5V vs. VCC =5V
RX Mode
RX to TX Mode
IOUT=-1mA, RXI=VB+1.5V
IOUT=+1mA, RXI=VB-1V,
Output Measured with
Respect to VB
RXI<350mVrs
Transmit Attenuator Gain (f=1kHz)
TX Mode, TXI=150mVrms
Idle Mode, TXI=150mVrms
TX to Rx Mode Range
TXO DC Voltage
ΔTXO DC Voltage
TXO High Voltage
TXO Low Voltage
TXI Input Resistance
Gain Tracking
GTX
GTXI
ΔGTXI
VTXO
ΔVTXO
VTXOH
VTXOL
RTXI
GTR
TX
TX to RX Mode
IOUT=-1mA, TXI=VB+1.5V
IOUT =+1mA, TXI=VB-1V,
Output Measured with
Respect to VB
TXI<350mVrs
GRX+GTX, @TX, IDIE, RX
Attenuator Control
RX Mode
CT Voltage ( CT-VB)
Idle Mode
TX Mode
CT Source Current
CT Sink Current
CT Slow Idle Current
CT Fast Idle Internal Resistance
VLC Input Current
Dial Tone Detector Threshold
VLC=VB
ICTR (Switching to RX Mode)
ICTT (Switching to TX Mode)
ICTS
RFI
IVLC
VDT
MIN TYP MAX UNIT
5.5 8 mA
600 800 μA
50 90
kΩ
2 VCC V
0.8 V
1.3 V
1.8 2.1 2.4
400 Ω
54 dB
4 6 8 dB
4 6 8 dB
-0.5 0 +0.5 dB
-25 -15 dB
-22 -20 -17 dB
49 52 54 dB
27 35
dB
VB V
+-10 +-150 mV
3.7 V
-1.5 -1 V
7 10 14 kΩ
4 6 8 dB
-22 -20 -17 dB
49 52 54 dB
VB V
+-30 +-150 mV
3.7 V
-1.5 -1 V
7 10 14 kΩ
+-0.1
dB
240
0
-240
-85 -60 -40
+40 +60 +85
0
1.5 2 3.6
-60
10 15 20
mV
mV
mV
µA
µA
µA
kΩ
nA
mV
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 13
QW-R108-020.A
5 Page 
UNISONIC TECHNOLOGIES CO., LTD
U4082B
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
Definition of the above is as follows:
Trems
Definition
Transmit The transmit attenuator is fully on: +6dB. And the receive attenuator is at max. attenuation :-46dB
Receive
Both attenuators are controlled by the volume control. At max. Volume the receive attenuator is fully
on: +6dB, and the transmit attenuator is at max.attenuation:-46dB.
Fast Idle
Both transmit and receive speech are present in approximately equal levels.
The attenuators are quickly switched to idle until one speech level dominates the other.
Slow Idle
Speech has ceased in both transmit and receive paths. The attenuators are then slowly switched to
the idle mode.
A summary of the truth table is:
1. Under all the below situations the circuit will switch to transmit :
(1) Both transmit level detectors sense signals relative to the respective receive level detectors
TLI1 versus RLI1, TLI2 versus RLI2
(2) The transmit background noise monitor indicates the presence of speech.
2. Under all the below situations the circuit will switch to receive
(1) Both receive level detectors sense higher signal levels relative to the respective transmit level detectors
(2) The receive background noise monitor indicates the presence of speech.
3. Under all the below situations the circuit will switch to the fast Idle mode:
(1) If the level detectors disagree on the relative strengths of the signal levels
(2) At least one of the background noise monitor indicates speech.
There are two conditions which can cause the fast idle mode to occur:
(A) When both talkers are attempting to gain control of the system by talking at the same time
(B) When one talker is in a very noisy environment, forcing the other to continually over-ride that noise level. In
general, the fast idle mode will occur infrequently.
4. Under any of the below situations the circuit will switch to the slow idle mode
(1) Both talkers are quiet( no speech present)
(2) When one talker’s speech level is continuously over-ride by noise at the other speaker’s location.
CT pin (pin14) determine the time required to switch the circuit between transmit, receive, fast idle, and slow
idle.
A schematic of the CT circuitry operates as follows:
* RT =120kΩ (typ.), and CT =5µF (typ.).
* Switching to the receive mode
I1 is turned on; I2 is off,
Charging the external capacitor to +240mV above VB
An internal clamp prevents further charging of the capacitor).
* Switching to the transmit mode
I2 is turned on; I1 is off,
Bringing down the voltage on the capacitor to -240mV with respect VB.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
11 of 13
QW-R108-020.A
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet U4082B.PDF ] | |
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