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LM1818 데이터시트(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM1818
상세설명  Electronically Switched Audio Tape System
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홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1818 데이터시트(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics
Automatic Level Control
(ALC) Response Characteristic
Preamp Input Noise Voltage
Preamp Input Noise Current
TLH7894 – 5
Application Hints
PREAMPLIFIERS
(Figure 5)
There are 2 identical preamplifiers with 1 common output
pin on the IC One amplifies low level inputs such as a mi-
crophone in the record mode and another amplifies the sig-
nal from the playback head in the playback mode The am-
plifiers use a common capacitor C6 to set the low frequen-
cy pole of the closed loop responses On the playback am-
plifier the collector of the input device is made available so
that an external low noise device can be connected in crit-
ical applications When using an external low noise transis-
tor pins 17 and 18 of the IC are shorted together to ensure
that the internal input transistor is turned OFF and the exter-
nal transistor’s collector is tied to pin 19 The input and
feedback connections are now made to the external input
transistor The amplifiers are stable for all gains above 5
and have a typical open loop gain of 100 dB R8 and R9
enable C6 to be quickly charged and set the DC gain Inter-
nal biasing provides a DC voltage independent of tempera-
ture at pin 17 so that the preamplifier DC output will remain
relatively constant with temperature Supply decoupling is
provided by an internal regulator Additional decoupling can
be added for the input stages by increasing the size of the
capacitor on pin 20 of the IC A fast charging circuit is con-
nected to the preamplifiers’ input capacitors (pins 16 and
17) to decrease the turn-ON time Larger input capacitors
decrease the noise by reducing the source impedance at
lower frequencies where 1f noise current produces an in-
put noise voltage The input resistance of the preamplifiers
is typically 50 kX
TLH7894 – 6
Quiescent DC Output Voltage
VDCe
1aR9R8J (05b50c10b6R2)VifR2aR3l10RE
where RE e
R8R9
R8 a R9
AC Voltage Gain
AAC e
R4 a
R3
1 a sC5R3
R2
a
1
TLH7894 – 7
FIGURE 5 Preamplifier
6


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