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LM1203B データシート(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1203B
部品情報  100 MHz RGB Video Amplifier System
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1203B データシート(HTML) 8 Page - National Semiconductor (TI)

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Circuit Description (Continued)
VIDEO AMPLIFIER SECTION
Figure 6 is a simplified schematic of one of the three video
amplifiers along with the recommended external compo-
nents The IC pin numbers are circled and all external com-
ponents are shown outside the dashed line The video input
is applied to pin 6 via a 10 mF coupling capacitor and a 47X
resistor The resistor is added to limit the current through
the input pin should the applied voltage rise above VCC or
drop below ground The performance of the LM1203B is not
degraded by the 47X resistor However if EMI is a concern
this resistor can be increased to well over 100X where the
rise and fall times will become longer DC bias for the video
input is through the 10k resistor connected to the 28V refer-
ence at pin 11 The low frequency roll-off of the amplifier is
set by the 10k resistor and the 10 mF capacitor Transistor
Q1 buffers the video signal to the base of Q2 Q2’s collector
current is then directed to the VCC1 supply directly or
through the 4k load resistor depending upon the differential
DC voltage at the bases of Q3 and Q4 This differential DC
voltage is generated by the contrast control circuit which is
described in the following sections A 001 mF decoupling
capacitor in series with a 30X resistor is required between
pins 2 and 3 to ensure high frequency isolation between the
three video amplifiers which share these common connec-
tions The video signal is buffered by Q5 and Q6 and DC
level shifted by the voltage drop across R5 The magnitude
of the current through R5 is determined by the voltage at pin
8 The voltage at pin 8 is set by the clamp comparator out-
put current which charges or discharges the clamp hold ca-
pacitor during the black level period of the video waveform
Transistors Q9 and Q10 are darlington connected to ensure
a minimum discharge of the clamp hold capacitor during the
time that the clamp capacitor is gated off Q7 Q8 and R6
form a current mirror which sets a voltage at the base of
Q11 Q11 buffers the video signal to the base of Q12 which
provides additional signal gain The ‘‘Drive’’ pin allows the
user to trim the Q12 gain of each amplifier to correct for gain
differences in the CRT and high voltage cathode driver gain
stages A small capacitor (several pico-Farads) from the
‘‘Drive’’ pin to ground will cause high frequency peaking and
slightly improve the amplifier’s bandwidth
For individual gain adjustment of each video channel a 51X
resistor in series with a 100X potentiometer should be used
with the red and green channel drive pins A 91X resistor
used with the blue channel drive pin sets the blue channel
amplifier gain at approximately 62 The 100X potentiome-
ters at the red and green channel drive pins allow a gain of
62 with g25% gain adjustment The video signal at the
TLH11489 – 10
FIGURE 6 Simplified Schematic of LM1203B Video Amplifier Section
with Recommended External Components
http
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