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LM1202 Scheda tecnica(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM1202
Spiegazioni elettronici  LM1202 230 MHz Video Amplifier System
Download  18 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1202 Scheda tecnica(HTML) 7 Page - National Semiconductor (TI)

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Circuit Description (Continued)
VIDEO AMPLIFIER SECTION (Output Stage)
A simplified schematic of LM1202’s video amplifier output
stage is shown in
Figure 4 The output stage is the second
gain stage Ideally the gain of the second gain stage would
be AV2 ebR21R18 eb16 Because of the output
stage’s low open loop gain the gain is approximately
AV2 eb10 Thus the maximum gain of the video amplifier
is AV e AV1 c AV2 e 20 Transistors Q23 and Q24 provide
a push-pull drive to the load The output voltage can swing
from 02V to 10V
CONTRAST CONTROL SECTION
A simplified schematic of LM1202’s contrast control section
is shown in
Figure 5 A 0V to 4V DC voltage is applied at the
contrast input (pin 8) Transistors Q29 Q30 and Q34 buffer
and level shift the contrast voltage to the base of Q36 The
voltage at the emitter of Q36 equals the contrast voltage
(Vcont) and the current through Q36’s collector is given by
IC36 e Vcont R28
Transistor Q36’s collector current is used to unbalance the
current through the differential pair comprised of Q38
and Q40 Q40’s base is internally biased at 53V and made
available at pin 20 Pin 20 is externally connected to pin 1
through a 100X resistor (see
Figures 2 and 3 ) The base of
Q38 (pin 3) is externally connected to pin 2 through a 100X
resistor (see
Figures 2 and 3 ) With Vcont e 2V the differ-
ential pair (Q38 Q40) is balanced and the voltage at pins 1
and 2 is 53V Under this condition Q8’s collector current is
equally split between Q9 and Q10 (see
Figure 3 ) and the
amplifier’s gain is half the maximum gain If contrast voltage
at pin 8 is greater than 2V then Q36’s collector current
increases thus pulling Q38’s collector node lower and
consequently moving Q38’s base below 53V With pin 2
at a lower voltage than pin 1 current through Q10 (see
Figure 3 ) increases and the amplifier’s gain increases With
Vcont e 4V the amplifier’s gain is maximum
If the contrast voltage at pin 8 is less than 2V then Q36’s
collector current decreases and Q38’s base is pulled above
53V With pin 2 voltage greater than pin 1 voltage less
current flows through Q10 (see
Figure 3 ) consequently the
amplifier’s gain decreases With Vcont e 0V the amplifier’s
gain is minimum (ie maximum attenuation)
TLH11440 – 5
FIGURE 4 Simplified Schematic of LM1202 Video Amplifier Output Stage
http
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