Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

U4082B-MFLG Datasheet(PDF) 6 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) 6 Page - ATMEL Corporation

Back Button 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 U4082B-MFLG Datasheet HTML 10Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 30 page
background image
6
4743D–CORD–03/06
U4082B
output of the speaker amplifier. On the transmit side, one level detector (TLI2) is at the output of
the microphone amplifier, while the other (TLI1) is at the hybrid output. The outputs RLO1 and
TLO1 feed a comparator, whose output is fed to the attenuator control block. Likewise, outputs
RLO2 and TLO2 feed a second comparator which also goes to the attenuator control block. The
truth table for the effects of the level detectors is given in the section “Attenuator Control Block”
on page 8.
3.4
Background Noise Monitors
This circuit distinguishes speech (which consists of bursts) from background noise (a relatively
constant signal level). There are two background noise monitors, one for the receive path and
the other for the transmit path. The receive background noise monitor is operated by the
RLI1-RLO1 level detector, while the transmit background noise monitor is operated by the
TLI2-TLO2 level detector (Figure 3-2).
They monitor the background noise by storing a DC voltage representative of the respective
noise levels in capacitors at CPR and CPT. The voltages at these pins have slow rise times
(determined by the external RC), but fast decay times. If the signal at RLI1 (or TLI2) changes
slowly, the voltage at CPR (or CPT) will remain more positive than the voltage at the non-invert-
ing input of the monitor's output comparator. When speech is present, the voltage on the
non-inverting input of the comparator will rise more quickly than the voltage at the inverting input
(due to the burst characteristic of speech), causing its output to change. This output is sensed by
the attenuator control block.
Figure 3-2.
Level Detectors
The 36 mV offset at the comparator's input keeps the comparator from changing state unless the
speech level exceeds the background noise by approximately 4.0 dB. The time constant of the
external RC (approximately 4.7s) determines the response time to background noise variations.
V
S
-
+
(TLI2) RLI1
(17) 26
0.1 µF
Level detector
(TLO2) RLO1
15
+
-
-
-
+
+
36 mV
-
+
350
Signal input
4 µA
0.1 µF
Signal input
Level detector
Background noise monitor
(RLI2) TLI1
(20) 23
TLO1
24
(19)
To attenuator
control block
-
+
Comparator
C2 (C1)
C4 (C3)
(CPT)
CPR
27
(16)
100 k
(18)25
2 µF
4 µA
47 µF
2 µF
(RLO2)
56 k
33 k
V
B
350
5.1 k
V
B
V
B
5.1 k


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