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PDF LM1818 Data sheet ( Hoja de datos )
| Número de pieza | LM1818 | |
| Descripción | Electronically Switched Audio Tape System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM1818 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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April 1987
LM1818 Electronically Switched Audio Tape System
General Description
The LM1818 is a linear integrated circuit containing all of the
active electronics necessary for building a tape recorder
deck (excluding the bias oscillator) The electronic functions
on the chip include a microphone and playback preamplifi-
er record and playback amplifiers a meter driving circuit
and an automatic input level control circuit The IC features
complete internal electronic switching between the record
and playback modes of operation The multipole switch
used in previous systems to switch between record and
playback modes is replaced by a single pole switch thereby
allowing for more flexibility and reliability in the recorder de-
sign
Monaural operation Figure 9
Features
Y Electronic record play switching
Y 85 dB power supply rejection
Y Motional peak level meter circuitry
Y Low noise preamplifier circuitry
Y 3 5V to 18V supply operation
Y Provision for external low noise input transistor
Typical Applications
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FIGURE 1 Stereo Application Circuit (Left Channel Shown) VS e 15V
Order Number LM1818N
See NS Package Number N20A
TL H 7894 – 1
C1995 National Semiconductor Corporation TL H 7894
RRD-B30M115 Printed in U S A
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Equivalent Schematic Diagram
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FIGURE 4
TL H 7894 – 4
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
External Components (Refer to Figure 9 Monaural Application Circuit) (Continued)
Component
C11
R13
R14
R15
R16
C12
C13
R17
C14
R18
R19
C15
C16
C17
R21
R22
C18
C19
C20
R23
R24
L1
C21
C22
H1
External Component Function
Exponentially falling or rising signal on pin 3 determines sequencing time
delay and operational mode of the record play anti-pop circuitry See anti-
pop diagram
R16 R14 and C12 determine monitor amplifier response in the play mode
R15 R14 and C12 determine monitor amplifier response in the record mode
Determines decay response on ALC characteristic and reduces amplifier pop
Determines time constant of meter driving circuitry
Meter sensitivity adjust
Record output DC blocking capacitor
Play output DC blocking capacitor
Changes record output response to approximate a constant current output in
conjunction with record head impedance resulting in proper recording
equalization
Preamplifier supply decoupling capacitor Note that large value capacitor will
increase turn-ON time
Supply decoupling capacitor
Decouples bias oscillator supply
Allows bias level adjustment
Adjusts DC erase current in DC erase machines (for AC erase see ‘‘Stereo
Application Circuit ’’ Figure 1 )
Optional bias trap
Bias Roll-Off
Record play head
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H2 Erase head (DC type AC optional)
Normal Range
of Value
0 – 10 mF
0 –50 kX
1k – 100k
30 kX –3 MX
30 kX –3 MX
0 1 mF –20 mF
5 mF –20mF
100k – %
0 1 mF –10 mF
100k – %
10 kX – 100 kX
1 mF –10 mF
0 1 mF –10 mF
500 pF – 0 1mF
5 kX – 100 kX
5 kX – 100 kX
0 1 mF – 500 mF
100 mF – 1000 mF
10 mF – 500mF
0–1 kX
1 mH – 30 mH
100 pF – 2000 pF
0 001 mF – 0 01 mF
100X – 500X
70 mH – 300 mH
10X – 300X
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM1818.PDF ] | |
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