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LM1203A-N データシート(PDF) 9 Page - Texas Instruments

部品番号 LM1203A-N
部品情報  LM1203A 150 MHz RGB Video Amplifier System
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM1203A-N データシート(HTML) 9 Page - Texas Instruments

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Circuit Description (Continued)
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 potentiometer
at the red and green channel drive pins allow a gain of 62
with g25% gain adjustment The video signal at the collec-
tor of Q12 is buffered and level shifted down by Q13 Q14
and Q15 to the base of the output emitter follower Q16 A
50X decoupling resistor is included in series with the emitter
of Q16 and the video output pin so as to prevent oscillations
when driving capacitive loads An external resistor should
be connected between the video output pin and ground
The value of this resistor should not be less than 390X or
else package power limitations may be exceeded under
worst case conditions (high supply voltage maximum cur-
rent maximum temperature) The collector current from the
video output transistor of each video channel is returned to
the power supply at VCC2 pin 23 When making power dissi-
pation calculations note that the data sheet specifies only
the VCC1 and VCC2 supply current at 12V supply voltage
with no pull down resistor at the output (ie RL e % see
test circuit
Figure 2 ) The IC power dissipation due to VCC2
is dependant upon the external video output pull down resis-
tor
TLH11441 – 9
FIGURE 5 Block Diagram of LM1203A Video Amplifier with Contrast and Black Level Control
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