Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

U4082B-MFLG Datasheet(PDF) 4 Page - ATMEL Corporation

Part # U4082B-MFLG
Description  Low-voltage Voice-switched IC for Hands-free Operation
Download  30 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U4082B-MFLG Datasheet(HTML) 4 Page - ATMEL Corporation

  U4082B-MFLG Datasheet HTML 1Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 2Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 3Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 4Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 5Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 6Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 7Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 8Page - ATMEL Corporation U4082B-MFLG Datasheet HTML 9Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 30 page
background image
4
4743D–CORD–03/06
U4082B
3.
Introduction
3.1
General
The fundamental difference between the operation of a speakerphone and a handset is that of
half duplex versus full duplex. The handset is full duplex since conversation can occur in both
directions (transmit and receive) simultaneously. A speakerphone has higher gain levels in both
paths, and attempting to converse in full-duplex mode results in oscillatory problems due to the
loop that exists within the system. The loop is formed by the receive and transmit paths, the
hybrid and the acoustic coupling (speaker to microphone).
The only practical and economical solution used to date is to design the speakerphone to oper-
ate in half-duplex mode. That is, only one person speaks at a time, while the other listens. To
achieve this, a circuit is required which can detect who is talking, switch on the appropriate path
(transmit or receive), and switch off (attenuate) the other path. In this way, the loop gain is main-
tained less than unity. When the talkers exchange functions, the circuit must quickly detect this,
and switch the circuit appropriately. By providing speech-level detectors, the circuit operates in a
“hands-free” mode, eliminating the need for a “push-to-talk” switch.
The handset has the same loop as the speakerphone. Oscillations do not occur because the
gains are considerably lower and the coupling from the earpiece to the mouthpiece is almost
nonexistent (the receiver is normally held against a person's ear).
The U4082B provides the necessary level detectors, attenuators, and switching control for a
properly operating speakerphone. The detection sensitivity and timing are externally controlla-
ble. Additionally, the U4082B provides background noise monitors (which make the circuit
insensitive to room and line noise), hybrid amplifiers for interfacing to Tip and Ring, the micro-
phone amplifier, and other associated functions.
15
VB
Output voltage
≈ V
S/2. It is a system AC ground and biases the volume control. A filter cap is required
16
CPT
An RC at this pin sets the time constant for the transmit background monitor
17
TLI2
Transmit level detector input on the microphone/speaker side
18
TLO2
Transmit level detector output on the microphone/speaker side, and input to the transmit background
monitor
19
RLO2
Receive level detector output on the microphone/speaker side
20
RLI2
Receive level detector input on the microphone/speaker side
21
RI
Input receive attenuator and dial tone detector. Maximum input level is 350 mVrms. Input impedance is
approximately 10 k
22
RECO
Receive attenuator output. DC level is approximately VB
23
TLI1
Transmit level detector input on the line side
24
TLO1
Transmit level detector output on the line side
25
RLO1
Receive level detector output on the line side and input to the receive background monitor
26
RLI1
Receive level detector input on the line side
27
CPR
An RC at this pin sets the time constant for the receive background monitor
28
GND
Ground
Table 2-1.
Pin Description (Continued)
Pin
Symbol
Function


Similar Part No. - U4082B-MFLG

ManufacturerPart #DatasheetDescription
logo
Unisonic Technologies
U4082B UTC-U4082B Datasheet
352Kb / 13P
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
U4082BG-D28-T UTC-U4082BG-D28-T Datasheet
352Kb / 13P
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
U4082BG-D28-T UTC-U4082BG-D28-T Datasheet
352Kb / 13P
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
U4082BG-S28-R UTC-U4082BG-S28-R Datasheet
352Kb / 13P
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
U4082BG-S28-R UTC-U4082BG-S28-R Datasheet
352Kb / 13P
VOICE SWITCHED SPEAKER-PHONE CIRCUIT
More results

Similar Description - U4082B-MFLG

ManufacturerPart #DatasheetDescription
logo
Panasonic Semiconductor
AN6175K PANASONIC-AN6175K Datasheet
210Kb / 21P
Hands-free Speech Network IC
AN6426NK PANASONIC-AN6426NK Datasheet
127Kb / 9P
Hands-free Speech Network IC
logo
NXP Semiconductors
TEA1093 PHILIPS-TEA1093 Datasheet
208Kb / 28P
Hands-free IC
1996 Feb 09
TEA1094 PHILIPS-TEA1094 Datasheet
221Kb / 28P
Hands free IC
1996 Jul 15
TEA1095 PHILIPS-TEA1095 Datasheet
184Kb / 28P
Voice switched speakerphone IC
1997 Nov 25
logo
TEMIC Semiconductors
U4080B TEMIC-U4080B Datasheet
169Kb / 15P
Voice-Switched Circuit for Handsfree Operation
U4084B TEMIC-U4084B Datasheet
544Kb / 26P
Low-Voltage, Voice-Switched Circuit for Hands-Free Operation
U4087B TEMIC-U4087B Datasheet
113Kb / 8P
Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone
logo
Zarlink Semiconductor I...
ZL38001 ZARLINK-ZL38001_06 Datasheet
543Kb / 49P
AEC for Analog Hands-Free Communication
logo
Taiwan Semiconductor Co...
TS34118 TSC-TS34118_13 Datasheet
378Kb / 21P
Voice Switched Speakerphone Circuit Chip disable for active/standby operation
More results


Html Pages

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 29 30


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com