LM1203AN National Semiconductor, LM1203AN Datasheet - Page 8

• Manufacturer Part Number: LM1203AN
• Description: IC VIDEO AMP RGB 150MHZ 28DIP
• Manufacturer: National Semiconductor

Specifications of LM1203AN

• Applications: General Purpose
• Number Of Circuits: 3
• -3db Bandwidth: 70MHz
• Current - Supply: 73mA
• Current - Output / Channel: 28mA
• Voltage - Supply, Single/dual (±): 10.8 V ~ 13.2 V
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LM1203AN

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Circuit Description
For individual gain adjustment of each video channel a 51
resistor in series with a 100
with the red and green channel drive pins A 91
used with the blue channel drive pin sets the blue channel
amplifier gain at approximately 6 2 The 100
at the red and green channel drive pins allow a gain of 6 2
with
tor of Q12 is buffered and level shifted down by Q13 Q14
and Q15 to the base of the output emitter follower Q16 A
50
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
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decoupling resistor is included in series with the emitter
25% gain adjustment The video signal at the collec-
FIGURE 5 Block Diagram of LM1203A Video Amplifier with Contrast and Black Level Control
potentiometer should be used
(Continued)
potentiometer
resistor
8
The value of this resistor should not be less than 390
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 V
pation calculations note that the data sheet specifies only
the V
with no pull down resistor at the output (i e R
test circuit Figure 2 ) The IC power dissipation due to V
is dependant upon the external video output pull down resis-
tor
CC1
and V
CC2
CC2
supply current at 12V supply voltage
pin 23 When making power dissi-
L
TL H 11441 – 9
e
% see
CC2
or