Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

LM1818 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM1818
Spiegazioni elettronici  Electronically Switched Audio Tape System
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1818 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI)

Back Button LM1818 Datasheet HTML 5Page - National Semiconductor (TI) LM1818 Datasheet HTML 6Page - National Semiconductor (TI) LM1818 Datasheet HTML 7Page - National Semiconductor (TI) LM1818 Datasheet HTML 8Page - National Semiconductor (TI) LM1818 Datasheet HTML 9Page - National Semiconductor (TI) LM1818 Datasheet HTML 10Page - National Semiconductor (TI) LM1818 Datasheet HTML 11Page - National Semiconductor (TI) LM1818 Datasheet HTML 12Page - National Semiconductor (TI) LM1818 Datasheet HTML 13Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 14 page
background image
Application Hints (Continued)
Anti-Pop Circuitry
(Figure 8)
The capacitor on pin 3 is used in a time delay system in
conjunction with C13 the ALC capacitor to suppress pops
when switching between record and playback
Figure 8 illus-
trates how this is done The output amplifier either record or
playback is shut off prior to switching and carefully rebiased
after switching takes place It is therefore required that a
proper ratio is selected between the ALC capacitor and the
logic input RC time constant The ALC capacitor must be
discharged to 07V within the time it takes the logic input
capacitor to 1) charge from VCC 2 to 07 VCC when switch-
ing from record to playback or 2) discharge from VCC 2 to
03 VCC when switching from playback to record These
times would normally be similar however the ALC capacitor
can be charged to a different initial value depending upon
the input to the ALC circuit The maximum value to which
the ALC memory capacitor will normally charge is 32V
therefore the maximum time allowed for discharging C13 is
given by
t1 e
(C13 c DV)
I1
e
C13
(32V b 07V)
350 mA
e
C13 c 72 c 104
If C13 e 10 mF t1 e 72 ms
It is now necessary to determine the minimum value for the
RP logic capacitor This is done by computing the time
between the 2 voltage switching points using the exponen-
tial equations for a single RC network
t2 e R13 C11 In
VCC
03 VCC
( b
R13 C11 In
VCC
05 VCC
( e051R13C11
To be sure that C13 is completely discharged let t2 l t1
R13 C11 l
t1
051
e
(72 ms)
051
e
141 ms
If C11 e 10 mF R13 e 15 kX
R13 should be kept to a value less than 50 kX to insure that
bias current existing from pin 3 does not cause an offset
voltage above 200 mV Typically this bias current is less
than 3 mA
Record Playback Switch
When the voltage on pin 3 of the IC is greater than 05 VCC
the internal record-playback switch switches into the play-
back mode During playback the record preamplifier re-
mains partially biased but the input signal to this preamp
does not appear at the preamplifier output In addition dur-
ing the playback mode the record monitor output (pin 9) is
disabled and the ALC circuit operates to minimize the signal
into the record preamp input The meter circuit is operation-
al in the playback as well as the record mode Similarly
during the record mode the playback preamp input is ig-
nored and the playback monitor output is disabled In addi-
tion a pin is available to hold one side of the record head at
ground potential while sinking up to 500 mA of AC bias and
record current
TLH7894 – 10
FIGURE 8A Anti-Pop Circuit
9


Codice articolo simile - LM1818

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Seoul Semiconductor
LM181 SEOUL-LM181 Datasheet
376Kb / 14P
   INFRARED LAMP LED
LM181 SEOUL-LM181 Datasheet
360Kb / 13P
   CYAN LAMP LED
LM181 SEOUL-LM181 Datasheet
392Kb / 14P
   RED OVAL LAMP LED
LM181 SEOUL-LM181 Datasheet
392Kb / 14P
   RED OVAL LAMP LED
LM181 SEOUL-LM181 Datasheet
378Kb / 14P
   RED LAMP LED
More results

Descrizione simile - LM1818

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Sanyo Semicon Device
LA4160 SANYO-LA4160 Datasheet
320Kb / 11P
   Single-Chip Tape Recorder Audio System
logo
National Semiconductor ...
LM1863 NSC-LM1863 Datasheet
268Kb / 14P
   AM Radio System for Electronically Tuned Radios
logo
Mechatronics, Inc.
LPH80B99 MECHATRONICS-LPH80B99 Datasheet
608Kb / 1P
   electronically commutated
LPH12A99 MECHATRONICS-LPH12A99 Datasheet
862Kb / 1P
   electronically commutated
LPH80A99 MECHATRONICS-LPH80A99 Datasheet
489Kb / 1P
   electronically commutated
LPH15P99 MECHATRONICS-LPH15P99 Datasheet
531Kb / 1P
   electronically commutated
LPH12A99-5 MECHATRONICS-LPH12A99-5 Datasheet
230Kb / 1P
   electronically commutated
LPH12B99 MECHATRONICS-LPH12B99 Datasheet
506Kb / 1P
   electronically commutated
LPH60B99 MECHATRONICS-LPH60B99 Datasheet
486Kb / 1P
   electronically commutated
logo
IET Labs Inc.
SOURCE IET-SOURCE Datasheet
227Kb / 1P
   Electronically Controlled Resistance Box
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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