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U4082BL-S28-T

Description
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
File Size349KB,13 Pages
ManufacturerUNISONIC TECHNOLOGIES CO.,LTD
Websitehttp://www.unisonic.com.tw/
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U4082BL-S28-T Overview

VOICE SWITCHED SPEAKER-PHONE CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD
U4082B
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.
LINEAR INTEGRATED CIRCUIT
DIP-28
SOP-28
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
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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