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LM1818N Folha de dados(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM1818N
Descrição Electrónicos  Electronically Switched Audio Tape System
Download  14 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1818N Folha de dados(HTML) 10 Page - National Semiconductor (TI)

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Application Hints (Continued)
TLH7894 – 11
FIGURE 8B Waveform for Anti-Pop Circuit
External Components (Refer toFigure 9 Monaural Application Circuit)
Component
External Component Function
Normal Range
of Value
R1
Used in conjunction with varying impedance of pin 5 forming a resistor divider
500X –20 kX
network to reduce input level in automatic level control circuit
C2
Forms a noise reduction system by varying bandwidth as a function of the
001 mF – 05 mF
changing impedance on pin 5 With a small input signal the bandwidth is
reduced by R1 and C2 As the input level increases so does the bandwidth
C1 C3
Coupling capacitors Because these are part of the source impedance it is
05 mF–10 mF
important to use the larger values to keep low frequency source impedance at
a minimum
C4
Radio frequency interference roll-off capacitor
100 pF – 300 pF
R2
Playback response equalization C5 and R3 form a pole in the amplifier
50X – 200X
response at 50 Hz C5 and R4 form a zero in the response at 13 kHz for
R3
47 kX – 33 MX
120 ms equalization and 23 kHz for 70 ms equalization
R4
2kX – 200 kX
C5
R5
Microphone preamplifier gain equalization
50X – 200X
R6
5kX – 200 kX
R7
DC feedback path Provides a low impedance path to the negative input in
0 – 2 kX
order to sink the 50 mA negative input amplifier current C6 R9 R7 and C7
R8
200X –5 kX
provide isolation from the output so that adequate gain can be obtained at 20
R9
1kX –30 kX
Hz This 2-pole technique also provides fast turn-ON settling time
C6
200 mF – 1000 mF
C7
0 – 100 mF
C8
Preamplifier output to monitor amplifier input coupling
005 mF–1 mF
C9
ALC coupling capacitor Note that ALC input impedance is 2 kX
01 mF–5 mF
R10
These components bias the monitor amplifier output to half supply since the
10 kX – 100 kX
amplifier is unity gain at DC This allows for maximum output swing on a
R11
10 kX – 100 kX
varying supply
R12
10 kX – 100 kX
C10
1 mF – 100 mF
10


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