파트넘버.co.kr U4082B 데이터시트 PDF


U4082B 반도체 회로 부품 판매점

VOICE SWITCHED SPEAKER-PHONE CIRCUIT



Unisonic Technologies 로고
Unisonic Technologies
U4082B 데이터시트, 핀배열, 회로
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


U4082B 데이터시트, 핀배열, 회로
UNISONIC TECHNOLOGIES CO., LTD
U4082B
LINEAR INTEGRATED CIRCUIT
„ PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
PIN NAME
FO
FI
CD
VCC
HTO+
HTO-
HTI
TXO
TXI
MCO
MCI
MUT
VLC
CT
VB
CPT
TLI2
TLO2
RLO2
RLI2
RXI
RXO
TLI1
TLO1
RLO1
RLI1
CPR
GND
DESCRIPTION
Output of filter. The output impedance is less than 50.
Input of filter. The input impedance is less than 1M.
Chip Disable input .A logic low (voltage lower than 0.8V) sets normal operation. A logic
high (voltage higher than 2V) disable the IC. This pin’s input impedance is 90 K
nominally.
This pin requires a supply voltage of +2.8V ~ +6.5V at 5mA. After VCC falls from 3.5V ~
2.8V, when in the receive mode, an AGC circuit reduces the receive attenuator gain by
25dB.
The output of the second hybrid amplifier. This amplifier’s gain is internally set at -1.
Output of the first hybrid amplifier. This amplifier’s gain of the amplifier is set by
external resistors.
The first hybrid amplifier’s input and summing node. DC level is about equal to VB.
The transmit attenuator’s output. DC level is about VB.
The transmit attenuator’s input. It’s maximum signal level is 350 mVrms. The input
impedance is 10K.
The microphone amplifier’s output. This amplifier’s gain is set by external resistors.
The summing node of the microphone’s input. DC lever is VB.
Input of mute. A logic low (voltage lower than 0.8V) sets the circuit normal operation. A
logic high (voltage higher than 2V) mutes the microphone amplifier, but it doesn’t affect
the rest of the circuit. The input impedance is 90 K ohms.
The input of Volume control. In the receive mode, when VLC=VB, the receive
attenuator is at maximum gain. The receive gain is down 35dB when VLC=0.3dB, and
it does not effect the transmit modes.
At this pin, to switch modes, the RC sets the response time for the circuit.
In this pin, there’s an output voltage=Vcc/2 which is a system AC ground and biases
the volume control. What required is a filter capacitor.
The time constant for the transmit background side can be set by the RC at this pin .
The input to the transmit level detector which is on the microphone/ speaker side.
The output to the transmit level detector which is on the microphone/ speaker side.
Also the input to the transmit background monitor.
The Output of the receive level detector which is on the microphone/ speaker side
The input to the receive level detector which is on the microphone/ speaker side
The input to the receive attenuator and dial tone detector. In this pin, the maximum
input level is 350mVrms,and the input impedance is 10K.
The output of the receive attenuator. This pin’s DC level is VB.
The input to the transmit level detector which is on the line side.
The output to the transmit level detector which is on the line side, and also the input to
the transmit background monitor.
The output of the receive level detector which is on the line side.
The input to the receive level detector which is on the line side.
The time constant for the receive background monitor can be set by the RC at this pin.
Ground.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 13
QW-R108-020.A




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VOICE SWITCHED SPEAKER-PHONE CIRCUIT - Unisonic Technologies